ORAL PRESENTATIONSp21mcm.inflpr.ro/BOOKLET_ABSTRACTS.doc · Web view4-6 MAY, 2009 Romanian...

Programme amp AbstractsProgramme amp Abstracts

4-6 MAY 20094-6 MAY 2009

Joint Conference of the 7th MC amp WG Meetings COST ACTION P21 bdquoThe physics of dropletsrdquo May 4-6 2009 Bucharest

Romanian Parliament House Romanian Parliament House BucharestBucharest

1


Table of ContentsTable of Contents

Locations map 2Committees 3Conference objectives 4Programme 5Oral presentations 13

General presentation about COST 14Working group 2 15Working group 3 25Working group 1 33

Posters 43Authors index 61Participants list 63

2


LocationsLocations

Registration lectures coffee breaks poster session and the management committee (MC) meeting will be held at Romanian Parliament House Hall Nicolae Balcescu Entrance A3S2 Str IzvorLunches will take place also at the Parliament House in a room adjacent to the conference hall

3


SCIENTIFIC COMMITTEESCIENTIFIC COMMITTEE Local organising committee Local organising committee INFLPRINFLPRLaser Spectroscopy GroupLaser Spectroscopy Group

ChairmanChairman Professor Nicolas VANDEWALLE

Chairman Chairman Professor Mihail Lucian PASCU

Vice-chair Dr Michele ADLER MembersMembers

MembersMembers Mădălina DICUProfessor Gunter BRENN Adriana SMARANDACHEProfessor Paul SCHEIER Angela STAICUProfessor Nikolai DENKOV Viorel NĂSTASĂProfessor Peter KRALCHEVSKY Ionuţ Relu ANDREIProfessor Krassimir DANOV Marian COJOCARUDr Farzam ZOUESHTIAGH Mihaela MARINDr Elise LORENCEAU Dr Michael SCHMIDTProfessor Cameron TROPEA Professor Thodoris D KARAPANTSIOSDr Stefan HUTZLER Professor Denis WEAIREDr Yoav TSORI Dr Alexander BRITAN Professor Stefano GUIDODr Libero LIGGIERI Dr Marino SIMEONE Professor Dirk VAN DEN ENDEProfessor Frieder MUGELE Professor Knut Jorgen MALOYProfessor Jon Otto FOSSUMProfessor Kazimierz MALYSAProfessor Stefan ANTOHE Professor Mihail PASCUProfessor Edvard GOVEKARProfessor Virginia PALERO-DIAZDr Miguel CABRERIZO VILCHESProfessor Lars BERGDAHLProfessor Jean-Pierre WOLFProfessor Jens EGGERSProfessor Stephen WILSON

4


CONFERENCE OBJECTIVESCONFERENCE OBJECTIVES

The main objective of the Conference is to report and exchange ideas for the fundamental understanding of the physics of droplets (production transport coating and stock) from the microscopic scale to the macroscopic world

The following topics will be addressed formation transport and manipulation of a droplet physical properties and study of fluid flows in a droplet coating and protection of a droplet applications and devices for microfluidics

Each topic will be tackled from a basic standpoint and will also consider the possible emerging applicationsThe Conference calls for presentations (oral and poster) on single specifically engineered droplets (down to micro and nano scale) and on large quantity droplets production up to emulsionsThe meeting will provide an opportunity to develop collaborations of European scientists active in the field with and within the specific industry Reports on practical applications in industry such as pharmacology lab-on-a-chip technology detergents food industry coating industry are strongly encouraged and welcomeThe SCIENTIFIC PROGRAMME will be organized by Working Groups which interact to each other in plenary sequential sessions dedicated respectively to

Formation transport and manipulation of a dropletFormation transport and manipulation of a droplet deformation and dynamics of moving and impacting droplets approached from theoretical and numerical points of view liquid flow inside the droplet - relevant to any application especially for the mixing of droplets modelling of micro-flows to understand the droplet interaction with its environment methods and means to transport and manipulate the liquid droplet specific surfaces elaborated considering the wetting properties of the droplets and the adhesion of the liquid onto a surface lsquodroplet handlingrsquo topic consisting of tools such as optical wrenches that are able to change the shape of the droplet to introduce another liquid in the droplet to divide a droplet into smaller entities

Coating and protecting dropletsCoating and protecting droplets encapsulating by controlling the external layers around the droplet core protected droplets handling and lifetime measuring droplets behaviour in emulsions development of a general theory of droplets coating using liquids with or without surfactants

Applications and devicesApplications and devices devices built on the bases of the collision of droplets the control of the mixing of two droplets of different liquids the coalescence of a droplet with another liquid the exchange dynamics with fluid surrounding the droplet

The Conference addresses to basic research physicists chemists engineers working on droplets micro-droplets and nano-droplets physics and applications young scientists and PhD students specialized pharma-industry SMEs

5


COST ACTION P21 ldquo THE PHYSICS OF DROPLETS rdquo

JOINT CONFERENCE of the 7TH MANAGEMENT COMMITTEE MEETING

andWORKING GROUPS MEETINGS

May 4th - 6th 2009Romanian Parliament House

Hall Nicolae Balcescu Entrance A3S2 Str IZVOR

Bucharest

OrganisersManagement Committee Chair Prof Nicolas Vandewalle

Dr Stegravephane Dorbolo

Local organiser Prof Mihail-Lucian PascuE-mail mihaipascuinflprro Phone +40 0728 916160

6

NATIONAL INSTITUTE FOR LASERS PLASMA AND RADIATION PHYSICS

ATOMISTILOR 409 PO Box MG-36 cod 077125 BUCURESTI-MAGURELETel + (4021) 457 44 89 Fax + (4021)457 42 43 httpwwwinflprro

Tel 4021 457 44 89 Fax 4021 457 42 43


SCIENTIFIC PROGRAMMESCIENTIFIC PROGRAMME

MAY 3MAY 3 rdrd 2009 2009

Arrival and accommodation

MAY 4MAY 4 thth 2009 ndash DAY 1 2009 ndash DAY 1

830 ndash 930Registration

930 ndash 1000Opening session

1000 ndash 1030Plenary sessionChair Michele Adler

S BeauloyeGeneral presentation on COST and the Open Call

1030 ndash 11001030 ndash 1100COFFEE BREAKCOFFEE BREAK

1100 ndash 1130Working Group 2 meeting (joint with WG1 and WG3 meetings)Chair Libero Liggieri

General Interest talkS Limage M Schmitt-Roziegraveres S Vincent-Bonnieu C Dominici M Antoni Nanoparticles stabilized emulsions Behind the Venus veil of droplets

1130 ndash 1230 Working Group 2 meeting (joint with WG1 and WG3 meetings) ndash continued Chair Libero Liggieri

1130 ndash 1150A Javadi J Kraumlgel P Pandolfini G Loglio VI Kovalchuk E V Aksenenko F RaveraL Liggieri R MillerShort time dynamic interfacial tension as measured with drop capillary pressure technique

7


1150 ndash 1210S Caserta G Tomaiuolo S GuidoNon-Newtonian effects on drop deformation under microconfined shear flow

1210 ndash 1230A Moskal Dynamics of aerosol aggregates - theory and practical applications

1230 ndash 1330LUNCHLUNCH (on place in a room adjacent to the conference hall)

1330 ndash 1530Working Group 2 meeting (joint with WG1 and WG3 meetings) ndash continued Chair Thodoris Karapantsios

1330 ndash 1350L Liggieri F Ravera E Santini M Ferrari R Miller G Loglio V Dutschk C Whitby D Fornasiero J RalstonInterfacial properties of nanoparticle-surfactant systems

1350 ndash 1410KG Marinova ES Basheva IB IvanovPhysico-chemical factors controlling the foamability and foam stability of milk proteins

1410 ndash 1430T Karapantsios M KostoglouElectrical resistance tomography for foam and emulsion stability measurements

1430 ndash 1450A Niecikowska M Krasowska J Ralston K MalysaInfluence of surface charge and hydrophobicity on kinetics of the three phase contact formation during bubble collision with TiO2 surface

1450 ndash 1510Y Couder A Eddi E FortDroplets walking on a liquid interface a macroscopic type of wave-particle duality

1510 ndash 1530K Szczepanowicz D Dronka-Goacutera L Szyk-Warszyńska P WarszynskiEncapsulation of emulsion drops

1530 ndash 1600 Working Group 3 meeting (joint with WG1 and WG2 meetings)Chair Mihail Lucian Pascu

General Interest talkM MuradogluImpact and spreading of a microdroplet on a solid wall

8



1630 ndash 1830 Working Group 3 meeting (joint with WG1 and WG2 meetings) ndash continuedChair Michele Ferrari

1630 ndash 1650D Kiselev M Moret L Bonacina JP Wolf Use of microdroplets in the aerosol analysis

1650 ndash 1710 ML Pascu IR Andrei C Ticos V Nastasa T BeicaLaser beams interactions with microdroplets

1710 ndash 1730 K Sadlej ML Ekiel-Jeżewska E WajnrybDestabilization of suspension drops conveyed by Poiseuille flow inside a channel

1730 ndash 1750S Antohe I Enculescu L IonPreparation and characterization of A2B6 nanowires arrays for photovoltaic applications

1750 ndash 1810 F Albert M SchmidtLaser droplet joining ndash systems process and applications

1810 ndash 1830M Weigl M SchmidtLaser droplet welding of dissimilar materials

18301830 Visit of the Romanian Parliament BuildingVisit of the Romanian Parliament Building

19301930DINNERDINNER

9


MAY 5MAY 5 thth 2009 DAY 2 2009 DAY 2

900 ndash 930Working Group 1 meeting (joint with WG2 and WG3 meetings)Chair Frieder Mugele

General Interest talkM T Kreutzer V van Steijn CR Kleijn P Parthiban SA KhanInstabilities in segmented flow ndash bubble formation and partial wetting


930 ndash 950M Schmitt-Roziegraveres J Kraumlgel DO Grigoriev L Liggieri R Miller S Vincent-Bonnieu M Antoni From spherical to polymorphous droplets in wateroil emulsions

950 ndash 1010 Y Tsori S Samin Phase separation transition in liquids and polymers induced by electric field gradients

1010 ndash 1030 S Tcholakova N Denkov D Hristova Emulsification and emulsion stability of silica-charged silicone oils


1100 ndash 1240Working Group 1 meeting (joint with WG2 and WG3 meetings) - continuedChair Nicolas Vandewalle

1100 ndash 1120N Denkov S Tcholakova K Golemanov A LipsJamming in sheared foams and emulsions explained by critical instability of the films between neighboring bubbles and drops

1120 ndash 1140D Terwagne T Gilet N Vandewalle S Dorbolo A drop of spectroscopy

1140 ndash 1200A Rozhkov B Prunet-Foch M Vignes-Adler Impact of drops of surfactant solutions

10


1200 ndash 1220ML Ekiel-Jeżewska E WajnrybMicro-droplets of a dense suspension settling under gravity in a viscous fluid

1220 ndash 1240V Palero J Lobera P Brunet MP Arroyo 3D velocity measurement in an oscilating drop


1340 ndash 1530POSTER SESSION (See the List of Posters at the end of this program) POSTERS TO BE DISPLAYED ON 4th OF MAY AT 1230

1530 ndash 1600FREE DISCUSSIONS ABOUT JOINT WG1 WG2 WG3 PROJECTS


1630 ndash 1800 Management Committee meeting (part I)

Draft Agenda - Seventh Management Committee MeetingDraft Agenda - Seventh Management Committee Meeting

1 Welcome to participants2 Adoption of agenda3 Minutes of last meeting4 Report from the Scientific Officer

bull News from the COST Officebull Status of Actionbull Number of Signatoriesbull Budget Status budget allocation process

5 Year Budget planning6 STSM status applications7 Publications annual report8 Evaluations9 Request for new members10 Non-COST participations11 Web news12 Progress report of working groups13 Long-term planning14 Time and place of next meeting15 AOB

1900 OPTIONAL DINNER1900 OPTIONAL DINNER

11



900 ndash 1030FREE DISCUSSIONS ABOUT JOINT WG1 WG2 WG3 PROJECTS ndash continued


1100 ndash 1230 Management Committee meeting (part II)

1230 ndash 1330LUNCH (on place in a room adjacent to the conference hall)

1330 END OF THE MEETING1330 END OF THE MEETING

A social program is organised on the 6 A social program is organised on the 6thth of May to visit Dracularsquos real tomb of May to visit Dracularsquos real tomb at 40 km north of Bucharestat 40 km north of Bucharest

12


LIST OF POSTERSLIST OF POSTERS

1 A J Meagher A van der Net D Weaire S Hutzler Diffusion properties of crystalline microbubbles

2 C Surdu-Bob M Badulescu Synthesis of metal spheres obtained in an anodic arc plasma in high vacuum

3 D Dimitrova F Ravera L Liggieri S Tcholakova K Marinova Surface dilatational rheological properties of surfactant mixtures

4 F Ravera L Liggieri M Ferrari G Loglio P Pandolfini Dilational viscoelasticity measurement by the oscillating bubbledrop techniques using a capillary pressure tensiometer

5 M Dicu A Staicu A Smarandache I R Andrei M Ferrari L Liggieri L Frunza M L Pascu Spectral studies of medicines to be delivered in microdroplets form

6 M Ferrari L Liggieri F Ravera M L Pascu M Dicu Wetting of solvents for drug delivery on superhydrophobic surfaces

7 N Vandewalle Antibubbles liquid onions and mayonnaise droplets

8 S Henin Y Petit D Kiselev J Kasparian J P Wolf Contribution of droplet explosion to charge release in laser-assisted condensation

9 S Kevorkian A Manea A Dinischiotu M Dicu M L Pascu M Costache B Carstocea Preliminary study of vancomycin on a normal epithelial retinal cell line

10 T Beica I Zgura L Frunza L C Nistor C Morosanu Wettability properties of textile materials by water droplets optically visualized

11 TR Sosnowski Atomization of pharmaceutical solutions

12 T Beica I Zgura L Frunza I R Andrei M Dicu M L Pascu Surface tension of drug solutions

13 I R Andrei M Ferrari L Liggieri M Dicu V Nastasa M L Pascu Characterization of microdroplets which contain solutions of medicines

14 M P Boneva K D Danov N C Christov P A Kralchevsky Strong hybrid electro-gravity-induced capillary attraction between charged particles at a fluid interface

15 L Liggieri G Loglio R Miller A Steinchen M Antoni M Roziere D Clausse L del Gaudio C Dalmazzone T Karapantsios V Dutschk R G Rubio G Picker T Dewandre O Minister S Vincent-Bonnieu ldquoFASES an instrument for Fundamental and Applied Studies of Emulsions Stabilityrdquo

13


Oral Oral presentationspresentations

14


1 General presentation on COST and the Open Call

S Beauloye

Organisation COST Address Avenue Louise 149 1050 Brussels Belgium

COST ndash European Cooperation in Science and Technology is one of the longest-running European instruments supporting cooperation among scientists and researchers across Europe COST is also the first and widest European intergovernmental network for coordination of nationally funded research activities COST mission is to strengthen Europe in scientific and technical research through the support of European cooperation and interaction between European Researchers COST has 34 member countries plus one cooperating state (Israeumll) and enables scientists to collaborate in a wide spectrum of activities grouped under nine key scientific Domains Ease of access for institutions from non-member countries also makes COST a very interesting and successful tool for tackling topics of a truly global nature

COST has proven to be a flexible and significant research networking tool that in recent years (since 2005) has been extended to include support of scientists from Near Neighbour countries (Balkan countries Mediterranean countries and NIS countries - Albania Algeria Armenia Azerbaijan Belarus Bosnia and Herzegovina Egypt Georgia Lebanon Lybia Moldova Morocco The Palestinian Authority Russian Federation Syria Tunisia Ukraine)

15


Working Group 2Working Group 2

2 Nanoparticles stabilized emulsions behind the Venus veil of droplets

S Limage 1 M Schmitt-Roziegraveres 1 S Vincent-Bonnieu 2 C Dominici 3 M Antoni 1

1 Aix-Marseille Universiteacute ndash Universiteacute Paul Ceacutezanne UMR-CNRS 6263 ISM France 2 European Space Agency Noordwijk The Netherlands

3 Aix-Marseille Universiteacute ndash Universiteacute Paul Ceacutezanne CP2M France

Emulsions are systems composed of immiscible liquids that consist in the simplest case in spherical droplets floating in a continuous phase The structure of the droplets depends on the presence of surface active agents (surfactants) andor nanoparticles that have the important property to modify the stability of emulsions The interplay between surfactants and nanoparticles in the ageing properties of emulsions is in many aspects still an open problem In this context the precise role of functionalized nanoparticles in emulsion stabilization is still unknown We show here that when both a cationic surfactant and silica nanoparticles are put together in the aqueous dispersed phase of water in paraffin oil emulsions important changes can be evidenced in the topology of the dispersed phase Depending on the relative concentrations of CTAB and silica particles a transition occurs in the shape of the droplets that from spherical become polymorphous Cryo-scanning electron microscopy is used to observe the inner structure of the droplets Microstructures are evidenced and shown to create skeleton-like structures that prevent droplets to be spherical We evidence how the interplay between nanoparticles surfactants and interfacial properties generate microstructures inside the droplets that explain their deformation When the droplets are spherical droplets contain silica nanoparticles aggregates while when theyrsquore not layered micro structures appear We believe the phenomena shown herein to be a general property of particle stabilized emulsions

16


3 Short time dynamic interfacial tension as measured with drop capillary pressure technique

A Javadi 1 J Kraumlgel 1 P Pandolfini 2 G Loglio 2 VI Kovalchuk 3 EVAksenenko 4 F Ravera 5 L Liggieri 5 R Miller 1

1 Max Planck Institute for Colloids and Interfaces Potsdam Germany2 Universita degli Studi di Firenze 50019 Sesto Fiorentino Firenze Italy

3 Institute of Biocolloid Chemistry Kiev Ukraine4 Institute of Colloid Chemistry and Chemistry of Water 03680 Kiev Ukraine

5 CNR-IENI Via de Marini 6 16149 Genova Italy

Dynamic interfacial tension measurement in the short time range is a major request for controlling interfacial processes in modern highly dynamic technologies Accurate measurements allow a quantitative analysis of the adsorptiondesorption processes of surface active agents which are directly coupled to the hydrodynamic characteristics A proper experimental technique is the key prerequisite for such target supported with a quantitative theory combining interfacial dynamics and mass transfer aspects Capillary pressure measurement during the growth and oscillation of drops is a suitable idea to fulfil the requirements The present contribution is an attempt to introduce the experimental procedure and data analysis to extract the respective interfacial tensions from the total measured pressure which is also including viscous pressure loss inertia and drag effects The following three different experimental protocols will presented 1- Pre-aged Growing Drop (PGD) 2- Stop Growing Drop (SGD) and 3- Continuous Growing Drop (CGD) According to the occurring capillary pressure maximum during the process of growing drops CGD is an ideal procedure among these protocols However due to the complexity of the drop detachment process which is the pre-stage of a new growing drop the definition of initial conditions for droplet size and interfacial composition is not easy to be accounted for in a quantitative theoretical analysis Also while the large droplet surface area change in CGD experiments is an important benefit the possible slip of droplet at the capillary edge and uncontrolled wettability effects during the first stage of drop growth are possible shortcomings of the CGD protocol On the other hand the SGD protocol with a pre-sized fresh droplet in absence of hydrodynamics effects and the PGD protocol with a transition from a well-defined equilibrium initial condition to a growing drop dynamics situation are complementary procedures to CGD All together represent a suitable technique for quantitative fast dynamic interfacial measurements

Keywords dynamic interfacial tension capillary pressure method growing drop tensiometer

17


4 Non-Newtonian effects on drop deformation under microconfined shear flow

S Caserta G Tomaiuolo S Guido

Dipartimento di Ingegneria chimica Universitagrave di Napoli Federico II Italy

The deformation and breakup of a droplet in an immiscible equiviscous liquid undergoing unbounded shear flow has been extensively investigated in the literature starting from the pioneering work of Taylor We have recently addressed the case of microconfined shear flow of an isolated droplet (Sibillo et al Phys Rev Lett 97 054502 2006) a problem which is relevant for microfluidics and emulsion processing applications The main effects of confinement include complex oscillating transients and droplet stabilization against breakup In particular very elongated droplet shapes are observed which would be unstable in the unbounded case and can be explained in terms of wall-induced distortion of the shear flow field Starting from this background this work will be focussed on recent results concerning the effect of non-Newtonian behaviour of the component fluids The main result is an enhancement of the effects of the confinement due to elastic contributions

18


5 Dynamics of aerosol aggregates - theory and practical applications

A Moskal

Warsaw University of Technology Faculty of Chemical and Process Engineering Waryńskiego 1 00-645 Warsaw Poland

The novel theoretical approach used in the modelling of motion of micrometer-and submicrometer-sized particle aggregates in the gas-phase is presented and compared to other models from the literature The results obtained for fractal-like aerosol particles with different morphology are demonstrated The applications of the proposed approach for the description of the dynamics of aerosol particles during filtration in the fibrous structures and during inhalation to the respiratory tract are highlighted

19


6 Interfacial properties of nanoparticle-surfactant systems

L Liggieri 1 F Ravera 1 E Santini 1 M Ferrari 1 R Miller 2 G Loglio 3 V Dutschk 4 C Whitby 5 D Fornasiero 5 J Ralston 5

1 CNR - Istituto per lrsquoEnergetica e le Interfasi Genova Italy 2 Max-Planck Institut fuumlr Kolloid und Grenzflaumlchenforschung Golm-PotsdamGermany

3 Dip Di Chimica Organica Univ di Firenze Italy4 Leibniz-Institut Polymerforschung Dresden Germany

5 Ian Wark Institute-University South Australia Adelaide Australia

The utilisation of solid micronanoparticles particles in association with surfactants represents an attractive route to control dropbubble coalescence or liquid film stability in foam and emulsion technology In fact the transferattachment of nanoparticles to liquid interfaces driven by their partial wettability strongly modifies the mechanical properties of the interfacial layers At large surface coverage particles can build solid-like barriers to coalescence such as particle networks while at low surface coverage small particles segregating at the interface may play a role more similar to surfactants affecting equilibrium and dynamic interfacial tensionSurfactant adsorption at the particle surface can be utilised to control such situations by tuning the hydrophilichydrophobic character of the particles and then their ability to form interfacial layersFor these mixed particle-surfactant systems interfacial properties such as dynamic interfacial tension are still poorly investigated These studies however can bring important information on the undergoing dynamic processes associated with particles and surfactant transfer and organisation at the interface and are essential to understand how to achieve film stabilisation by the smallest amount of particles or surfactantPrevious investigations [12] have shown the effectiveness of dilational rheology in providing a better comprehension of dynamic mechanisms occurring in the interfacial layer In some cases rheological studies allow in fact the equilibrium and kinetic parameters related to the structure of the particle layer and to the particle interaction to be accessedHere we summarise results obtained for interfacial layers containing silica or alumina nanoparticles which can be utilized as stabilisers for foams andor emulsions Different degree of hydrophobicity and consequently different affinity with the wateroil interfaces is obtained by using specific anionic or cationic surfactants The results for a particular arrangement with the surfactant soluble only in the oil phase and hydrophilic particles dispersed in the aqueous phase where the surfactant-nanoparticle interaction occurs only at the interface is also reported

[1] F Ravera E Santini G Loglio M Ferrari L Liggieri J of Physical Chemistry B 110 19543 2006[2] F Ravera M Ferrari L Liggieri G Loglio E Santini A Zanobini Colloids Surf A 323 99-108 2006

20


7 Physico-chemical factors controlling the foamability and foam stability of milk proteins

K G Marinova E S Basheva I B Ivanov

Laboratory of Chemical Physics amp Engineering Faculty of Chemistry Sofia University 1 James Bourchier Ave 1164 Sofia Bulgaria

We explored the foaming behaviour of the two main types of milk proteins flexible caseins and globular whey proteins Direct foam comparison was complemented with measurements in model experiments such as thin foam films dynamic surface tension and protein adsorption Foaming was studied as a function of pH (from below to above isoelectric point pI) and range of ionic strengths Maximum foamability was observed near pI 42 for WPC in contrast to sodium caseinate which had minimum foaming near pI = 46 Good foamability behavior correlated well with an increased adsorption faster dynamic surface tension decrease and increased film lifetime Differences in the stability of the foams and foam were explained with the different molecular structure and different aggregation behaviour of the two protein types Far from its isoelectric pI casein adsorption layers are denser and thicker thus ensuring better stabilization Added electrolyte increased further the adsorption and the repulsion between the surfaces (probably by steric andor osmotic mechanism) In contrast the globular molecules of WPC probably could not compact well to ensure the necessary films and foams stabilization far from pI even after electrolyte addition

21


8 Electrical resistance tomography for foam amp emulsion stability measurements

T D Karapantsios M Kostoglou

Department of Chemistry Aristolte University of Thessaloniki University Box 166 541 24 Thessaloniki Greece

The stability of foams and emulsions is examined with respect to spatial volumetric distribution of the two phases To achieve this goal we have developed two types of electrical resistance tomography (ERT) setups for determining the phasesrsquo spatial distribution (one conducting phase and one non-conducting phase ) They are both suitable to monitor the spatial volumetric distribution of two phases and even provide their volume fractions inside test vessels of varying size They are good for real time measurement of foamemulsion generation and of the subsequent phases destabilization and separation The first ERT setup uses ring electrodes (mounted around the circumference of vessels) at different axial positions to yield the instantaneous longitudinal phase distributions This setup can reach extremely fast measuring speeds so it can capture rapid phase redistributions such as those in rapidly decaying foams and emulsions In addition it provides estimations on the radial dimension but not on the angular dimension The second ERT setup uses several small square electrodes mounted at equal distances apart around the circumference of vessels to form a plane of measurements Four separate planes each at a different axial position of a vessel have been constructed and tested for simultaneous measurement This setup provides detailed phase distributions in all 3 dimensions but it is slower than the first one So the two setups are complementary The aforementioned techniques have been successfully tested in a typical foam and emulsion system

22


9 Influence of surface charge and hydrophobicity on kinetics of the three phase contact formation during bubble collision with TiO2 surface

A Niecikowska 1 M Krasowska 2 J Ralston 2 K Malysa 1

1 Institute of Catalysis and Surface Chemistry Polish Academy of Sciencesul Niezapominajek 8 30-239 Cracow Poland

2 Ian Wark Research Institute University of South Australia Mawson Lakes SA 5095 Australia

When the bubble collides with a liquidsolid interface then depending on forces interacting within the film either a stable wetting film or three phase contact (TPC) can be formed Influence of solution pH and modification of hydrophilichydrophobic properties of titania surface on stability of the wetting film formed by the colliding bubble was studied using high speed camera Since point of zero charge of titania is at pH=45 therefore the titania surface charge can be reversed by changing the solution pH As the bubbles bear a negative surface charge from very low pH values (pH~2) so importance of the electrostatic interaction between similarly and oppositely charged interfaces could be investigated Simultaneously the influence of the titania hydrophobicity was studied We found that for hydrophilic titania surface the wetting film was stable (TPC was not formed) within all pH range (17-7) studied ie independently of electrical surface charge of the interacting interfaces However we observed that with increasing titania surface hydrophobicity the attractive electrostatic interaction started to be factor affecting the kinetics of the three phase contact formation When the three phase contact was formed then the time of the three phase contact formation was at minimum at pH = 4 ie at pH when the titaniasolution interface was positively and the bubble surface negatively charged The time of the TPC formation was always longer both at pH = 17 (both interfaces positively charged) and pH = 7 (both interfaces negatively charged)

23


10 Droplets walking on a liquid interface a macroscopic type of wave-particle duality

Y Couder A Eddi E Fort

Laboratoire Matiegravere et Systegravemes Complexes Bacirctiment CondorcetUniversiteacute Paris Diderot ndashParis 7 ndash 10 rue Alice Domon et Leacuteonie Duquet

75205 PARIS Cedex 13 - France

We had shown in a previous work(1-4) that a droplet can be kept bouncing on the surface of the same fluid if this bath oscillates vertically For oscillations of small amplitude the surface on which the drop bounces is flat When the amplitude of the periodic forcing is increased the rebounds excite surface waves This phenomenon becomes dominant near the Faraday instability threshold In this range of imposed oscillation amplitudes the droplet bounces at a sub-harmonic frequency and thus becomes efficient in emitting Faraday waves Since we are below but near the instability threshold the waves emitted by the droplet are almost sustained by the parametric forcing Correlatively both the droplet and its associated wave packet start spontaneously moving at constant velocity on the interface We have thus obtained a symbiotic association of a particle (the droplet) with the wave it emits We call it a ldquowalkerrdquoThe very nature of these walkers invites to revisit a fundamental issue how is the continuous and spatially extended nature of a wave compatible with the localized and discrete nature of a particle More specifically what happens to the droplet if the wave is split being partially reflected on a barrier With this aim we have investigated the trajectories of walkers as they collide with submerged barriers Over these barriers the walkers are non-propagative and impinging on a thick barrier a walker is systematically reflected But when the barrier is thin the walker can be either reflected or transmitted We show that the reflection or transmission of a given incident walker is unpredictable However statistically it recovers a deterministic behaviour and the crossing probability decreases exponentially with increasing barrier width These results show that the existence of a classical wave-particle duality can generate a quantum-like tunnelling effect at a macroscopic scale

[1] Y Couder E Fort C-H Gautier A Boudaoud Phys Rev Lett 94 177801 2005[2] Y Couder S Protiegravere E Fort A Boudaoud Nature 437 208 2005 [3] S Protiegravere A Boudaoud amp Y Couder J Fluid Mech 554 85-108 2006[4] Y Couder E Fort Phys Rev Lett 97 154101 1-4 2006

24


11 Encapsulation of emulsion drops

K Szczepanowicz D Dronka-Goacutera L Szyk-Warszyńska P Warszynski

Institute of Catalysis and Surface Chemistry Polish Academy of Sciencesul Niezapominajek 8 30-329 Krakow Poland

We demonstrated two methods of encapsulation of emulsion drops to obtain the liquid core capsules within the size range of 50 ndash 200 nm First method is based on the formation of emulsion droplets containing silane derivatives which can undergo hydrolysis and condensation on the drop surface that leads to formation of silica shell around liquid or semi-liquid core We used APS (3ndashaminopropyl) triethoxysilane) and DTSACl (dimethyloctadecyl [3-(trimethoxysilyl)propyl] ammonium chloride) as silica sources in emulsions of chloroform in water We measured the interfacial tension of chloroformwater interface in presence of silica sources to establish the conditions favourable for emulsification Then we obtained emulsions by evaporation technique stabilized if it was necessary by addition of TWEEN 80 We prepared emulsions containing different amount of APS or DTSACl with the average drop size 50 ndash 200 nm and we examined their zeta potential and stability Progress of shell formation by hydrolysis of silica sources were observed using NMR-spectroscopy The second method of preparation of loaded nanocapsules is based on the liquid cores encapsulation by multilayer polyelectrolyte adsorption The process requires a specific selection of surfactants which simultaneously have good properties as emulsifier and provides a stable surface charge for sequential adsorption of polyelectrolytes without losing stability of the emulsion We present the results for encapsulation of the emulsion of oil drops stabilized by AOT(Docusate sodium salt) PDADMAC (polydiallyldimethylammonium chloride) surface complex by various combinations of synthetic and natural polyelectrolytes The multilayer polyelectrolyte shells were prepared by saturation method The resulting capsules of the size 100 ndash 200 nm were visualized by incorporation of fluorescent dye either to the capsule core or to its shell

25



12 Impact and spreading of a microdroplet on a solid wall

M Muradoglu

Department of Mechanical Engineering Koc University Rumelifeneri Yolu Sariyer 34450 Istanbul Turkey

Impact and spreading of a viscous micro droplet are studied computationally using a finite-differencefront-tracking method The problem is motivated by single cell epitaxy developed for printing biological cells on a solid substrate using ink-jet printer technology In this study we consider impact and spreading of a simple droplet on a partially wetting substrate as a first step in developing a complete compound droplet model for the single cell epitaxy The numerical method is general and can treat non-wetting partially wetting and fully wetting cases but the focus here is placed on partially wetting substrates The contact angle is specified dynamically using the empirical correlation given by Kistler (1993) In addition a precursive film model is also used especially for the highly wettable cases ie the static contact angle is smaller than 30$^o$ due to numerical difficulty of resolving thin liquid later penetrating into surrounding gas near the solid surface The numerical method is first applied to simple droplet spreading and the results are compared with experimental data of Sikalo et al (2005) Then the effects of governing non-dimensional numbers on the spreading rate apparent contact angle and deformation of the droplet are investigated Finally a few preliminary results are presented for the impact and spreading of a compound microdroplet on a partially wetting surface

Key Words Compound droplet dynamic contact angle front-tracking method single cell-epitaxy

Acknowledgements This work is supported by the Scientific and Technical Research Council of Turkey

26


13 Use of microdroplets in the aerosol analysis

D Kiselev M Moret L Bonacina J P Wolf

Groupe de physique appliqueacute bio-photonique Universiteacute de Genegraveve Ecole de meacutedecine No 20 1211 Geneva Switzerland

Rapid detection and identification of pathogenic aerosols such as Bacillus anthracis (anthrax) from potential bioterrorism release as well as epidemic agents of infectious diseases are urgent safety issues1 We recently developed a technique in which the potentially harmful bacteria are sorted out by a puff of air2 enriching the aerosol mixture by several orders of magnitude (figure 1) A major difficulty is however to transfer the particles in the liquid phase after sorting in order to identify the pathogen type (by biochemical assays Raman spectroscopy aso)

Here we propose to use a droplet instead of an air puff in order to use the droplet as a micrometer size-reactor and thus to drive cost and maintenance to a minimum

We developed and built the experimental set-up (figure 2) that allows for studying the interaction between (fluorescently labelled) particles and water droplets The device was designed to address and sort out individual particles of different size shape and composition (polysterene spheres salt crystals bacteria)

The next step will be the study of interaction between droplets and solid particles as a function of size velocity viscosity etc We would like to test different approaches for improving the collection efficiency For instance particles and droplets will be charged with opposite signs to improve sticking and coalescence

Fig1 Basic scheme

Fig2 3D ModeleActual set-up

The collected particles will be analyzed both by chemical and optical means Biochemical identifyers such as aptamers will be embedded in the droplets to realize chemical microreactors for the chemical analysis For the optical measurments multi-photon fluorescence Raman and laser plasma spectroscopy (LIBS) will be emploied

[1] Pan Y L J Hartings et alSingle-particle fluorescence spectrometer for ambient aerosols Aerosol Science and Technology 378 628-639 2003[2] Pan Y L V E Boutou et al A puff of air sorts bioaerosols for pathogen identification Aerosol Science and Technology 38 6 598-602 2004

27


14 Laser beams interactions with microdroplets

M L Pascu 1 I R Andrei 1 C Ticos 1 V Nastasa 1T Beica 2

1 National Institute for Laser Plasma and Radiation Physics Bucharest Romania2 National Institute for Materials Physics Bucharest Romania

The paper reports on the interaction of laser beams with dropletsmicrodroplets of distilled water The droplets were generated using a computer controlled system (Microlab ML560C Hamilton) The pumped liquid volumes were typically 4 ndash 5 microl with diameters of the generated droplets in the range 15 ndash 2mmThe droplets images were recorded using a PHOTRON FASTCAM camera and the recordings were made at 500 framessec with a resolution of 10241024 pixelsThe laser beam incident on the droplet was emitted in single pulse regime at 540nm the laser pulse having 6ns FTW The beam was focused on the dropletrsquos surface so that the focus diameter was 01mm and the peak power density in the focus was around 3 kWcm2 At this value the droplet was sputtered in 4π when exposed to a single pulseIn order to obtain more effects on the droplet without destroying it the energy density of the laser pulse was lowered down to 009kWcm2 ndash 024kWcm2 by passing the laser beam through a neutral optical filterThe breakdown at high power densities on the droplet surface is accompanied by the formation of plasma which propagates at supersonic speed and is accompanied by emission of radiation in the visibleTowards lower power densities besides the shock wave produced by the plasma and the plasma emission a small liquid volume is expulsed form the droplet and the remaining droplet exhibits an oscillatory movement sometimes accompanied by the climbing of the droplet on the capillary tipThe forms of the droplets and their modification were measured the time evolution of the droplets form and of the cross section surface through the droplet was studied as well as the linear dimensions variations of the cross sections

Aknowledgements The authors are grateful to Romanian Ministry of Education and Research for the financial support by PALIRT2007 Project

28


15 Destabilization of suspension drops conveyed by Poiseuille flow inside a channel

K Sadlej M L Ekiel-Jeżewska E Wajnryb

Polish Academy of Sciences Institute of Fundamental Technological Researchul Świętokrzyska 21 00-049 Warsaw Poland

In this work we consider a suspension drop conveyed by Poiseuille flow inside a channel modeled by two infinite parallel walls The drop is modelled by a cluster of solid spherical particles separated by fluid identical to the surrounding environment Low-Reynolds-number flow is assumed leading to a mathematical description based on the Stokes equations Hydrodynamic interactions between individual particles and walls are evaluated within the frame-work of the multipole method In course of the evolution the initially spherical cluster gets deformed by the fluid flowFrom our perspective the most important and interesting phenomenon occurring during evolution is a shear induced destabilization process of the suspension drop Depending on the density of the suspension drop the rate and character of destabilization changes significantly For small densities the individual particles are packed relatively loose allowing for fluid to penetrate quickly and disperse the particles On the other hand drops characterized by high volume fractions stay compact for significantly longer times and tend finally to destabilize into clusters of smaller size which further remain intact rotating during evolution Three snapshots of the evolution are presented in Figure 1 There the volume fraction of the drop is 40 All particles have been projected onto a single plane The flow is in the horizontal x direction parallel to the walls placed at z=0 and z=50 (dimensions measured in particle diameters) The Poisueille flow amplitude is 1

-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35

Figure 1 Three snapshots of the evolution of a suspension drop conveyed by Poiseuille flow The initial spherical drop first deforms Then smaller clusters of particles detach from the main group Their motion is characterized by rotation exhibited by elongated bodies in shear flow Note that even for very long times one cluster contains a great majority of particles

The outcome of this research may be useful in the field of micro-fluids concerning micro- and nanoparticle transport through channels Note that the flow considered here ndash the Poiseuille flow constrained by two parallel walls ndash is identical to the flow present in such channels This research was partly also inspired by medical application concerning pulmonary drug delivery by inhalation The therapeutic effectiveness of an inhaled drug depends on how much of it bypasses the oropharynx and deposits in the lungs It is therefore important to control the rate at which clusters of the drug destabilize

30

z x


16 Preparation and characterization of A2B6 nanowires arrays for photovoltaic applications

S Antohe 1 I Enculescu 2 L Ion 1

1 University of Bucharest Faculty of Physics PO Box MG-11 Magurele 077125 Romania2 National Institute for Materials Physics PO Box MG-7 Magurele 077125 Romania

Nanowires made of A2B6 semiconductor compounds were produced by using a template method Polymer ion track foils (30 micrometers thick) were used as templates after a proper chemical etching Nanowires were electrochemically grown in the resulting pores A discussion of the observed correlations between the morphologicalstructural properties of the wires and the growth conditions is givenElectrical properties of the arrays of nanowires were studied in the temperature range of 40 K ndash 300 K after contacting them by sputtering a gold layer on top of the membranes Symmetric non-linear I-V characteristics were recorded in the voltage range used and an activated electrical resistance was observed in the ohmic regime After establishing the influence of growth conditions on the composition and structure of CdTe wire arrays samples were produced for use in the fabrication of hybrid inorganicorganic photovoltaic structures A thin film of organic dyes in our case either zinc phthalocyanine (ZnPc) or 5101520-tetrakis(4-pyridyl)-21H23H-porphine (TPyP) is used as light absorber in such structures A better efficiency of exciton dissociation process has been obtained by creating a large area interface between the organic dye and a nanostructured inorganic semiconductor but currently work is necessary to improve the efficiency of these structures

31


17 Laser droplet joining ndash systems process and applications

F Albert M Schmidt

Bayerisches Laserzentrum GmbH Konrad-Zuse-Straszlige 2-6 91052 Erlangen Germany

New joining applications always demand new and innovative joining technologies in order to meet the different requirements of todays and future production Laser Droplet Joining is an innovative technology that opens up application possibilities beyond state of the art laser joining methods At Laser Droplet Joining the process is realized by a laser generated liquid metal droplet which is deposited onto the parts to be joined Regarding the restrictions of conventional laser micro welding or brazing the advantages of Laser Droplet Joining become obvious The droplets offer sufficient material to bridge gaps between the joining partners The thermal influence on the partners is only given by the energy stored in the droplet This technology is suited to join high reflective parts and heat sensitive components eg thin metallic foils or wires on thin metallizations of ceramic substrates Different system technologies with different setups for the realization of the Laser Droplet Joining process will be shown and discussed Further investigations are focused on the process sequence especially on the droplet creation droplet flight and joining process on different materials for applications in the fields of electronics production precision engineering as well as medical technology

32


18 Laser droplet welding of dissimilar materials

M Weigl M Schmidt


ldquoLaser Droplet Weldingrdquo is an innovative technology for producing material conclusive connections between dissimilar materials The weld is realized by a laser generated liquid metal droplet placed onto the parts to be joined Hereby the material for the droplet is fed in form of wire whose tip gets molten by laser radiation In addition to the possibility of joining dissimilar materials the process implies the advantage of being able to bridge gaps between the connected parts by the droplets The low thermal stress for the joining partners only induced by the heat content of a single droplet is another advantage of the process This definable thermal load provides the opportunity to weld even small devices thin coatings and heat sensitive components without negative influence on their mechanical and electrical function At the COST-meeting a closer look at the Laser Droplet Welding process with its advantages and disadvantages will be given In particular results of Laser Droplet Welding joints of dissimilar materials are presented and discussed The analysis of the microstructure in the welding area with its alloys and the hardness tests allow deeper insight into the metallophysical changes during the welding process by issuing qualitative and even quantitative information on this welding technique

33


Working Group 1 Working Group 1

19 Instabilities in segmented flow ndash bubble formation and partial wetting

M T Kreutzer 1 V van Steijn 1 CR Kleijn 1 P Parthiban 2 SA Khan 2

1 Delft University of Technology Julianalaan 136 2628 BL Delft The Netherlands2 National University of Singapore National University of Singapore Blk E5 4 Engineering

Drive 4 Singapore 117576

An important application of multiphase microfluidics is chemical analysis and synthesis using segmented flows in which aliquots of one phase act as micoreactors that are convected through a chip network by another phase In this talk we address to important questions how are bubbles formed and how are they convected along in hydrophobic (PDMS) chips

It is well understood how bubble volume scales with flow rates of gas and liquid (Garstecki 2005) With respect to the mechanism of formation there are two conflicting views The first is that the forming bubble goes through a series of equilibrium shapes until the final stage of pinch-off (Garstecki 2005) The second view is that pinch-off is a Plateau-Rayleigh-like instability problem not in equilibrium at all In this talk we report experiments that resolve this issue Our conclusion is that the pinch-off is not driven by a local capillary instability but rather depends on secondary flows around the forming bubble driven by differences in Laplace pressures In the initial stages of bubble formation liquid leaks past the forming bubble and more interestingly we observe that the pinch off is driven by a reversal of this leakage ie by countercurrent flow through the gutters This insight allows us to predict accurately how the size of bubbles and droplets scales with the widths and height in the T-junction without any fitted parametersThe second question deals with partial wetting around an elongated bubble in a rectangular microchannel The classical experiments of partial wetting are the withdrawal of a flat plate from a bath (Snoeijer 2008) or the withdrawal of a liquid plug from a liquid-filled tube of circular cross-section (Quere 1991) While insightful such experiments do not address phenomena that arise from the inability of fluid interfaces to conform to sharp wedges or corners This lack of topological agreement leads to remarkable consequences In our geometry we find three regimes non-wetting full forced wetting and unstable forced wetting We observe that the Landau-Levich films are unconditionally unstable and given enough time rupture near the gutters The mechanism for film rupture has many interesting similarities to film draining near Plateau borders Engineering aspects of microfluidic segmented flows such as fluidic resistance follow naturally from the understanding of the partial wetting phenomena developed here

34


20 From spherical to polymorphous droplets in wateroil emulsions

M Schmitt-Roziegraveres 1 J Kraumlgel 2 DO Grigoriev 2 L Liggieri 3 R Miller 2 S Vincent-Bonnieu 4 M Antoni 1

1 Aix-Marseille Universiteacute ndash Universiteacute Paul Ceacutezanne UMR-CNRS 6263 ISM Centre St Jeacuterocircme BP 451 Marseille 13397 Marseille Cedex 20 France

2 MPI of Colloids and Interfaces Am Muumlhlenberg 1 14476 Potsdam-Golm Germany3 CNR-IENI Via de Marini 6 16149 Genova Italy

4 ESA Physical Science Unit Keplerlaan 1 2200 AG Noordwijk The Netherlands

Optical scanning tomography is used to characterize bulk properties of transparent and dilute water in paraffin oil emulsions stabilised with CTAB A flow of five hundred grey level images are used to analyse each scanning shot of the considered emulsions with a precision of 1 μm The role of silica nanoparticles in the structure of the water droplets is investigated Depending on the concentration of CTAB and nanoparticles a transition occurs in their shape that changes from spherically to polymorphous This transition is controlled by the ratio R=[CTAB][SiO2] and is described using an identification procedure of the topology of the grey level contours of the images The transition occurs for Rcritsasymp310-2 and is shown to correspond to a pH of the dispersed phase of 85

35


21 Phase separation transition in liquids and polymers induced by electric field gradients

Y Tsori S Samin

Dept of Chemical Engineering Ben-Gurion University 84105 Beer-Sheva Israel

Spatially uniform electric fields have been used to induce instabilities in liquids and polymers and to orient and deform ordered phases of block - copolymers Here we discuss the demixingphase transition occurring in liquid mixtures when they are subject to spatially nonuniform fieldsAbove the critical value of potential a phase-separation transition occurs and two coexisting phases appear separated by a sharp interface Analytical and numerical composition profiles are given and the interface location as a function of charge or voltage is found The possible influence of demixing on the stability of suspensions and on inter-colloid interaction is discussed

36


22 Emulsification and emulsion stability of silica-charged silicone oils

S Tcholakova N D Denkov D Hristova

Laboratory of Chemical Physics amp Engineering Faculty of Chemistry Sofia University Bulgaria

The emulsification of oils containing hydrophobic solid particles could be a serious challenge because the particles play the role of very efficient demulsifying agent To find appropriate conditions for emulsification of silicone oils containing hydrophobic silica particles of high concentration (up to 20 wt ) we performed systematic experiments to clarify which factors play significant role in the emulsification process These experiments showed that emulsification is possible only when the viscosity of the aqueous surfactant solutions is sufficiently high so that the oil emulsification occurs in the viscous regime and the interfacial tension is sufficiently low An additional requirement specific to these systems is that the emulsion films should be thicker than the protrusion depth of the silica particles into the aqueous phase in order to avoid the demulsification effect of the particles Best results were obtained with properly selected surfactant-polymer mixtures which satisfied all requirements for efficient oil drop breakup and formation of stable oil-in-water emulsions Interestingly stable water-in-oil emulsions were obtained much easier when appropriate surfactants decreasing the contact angle of the silica particles below 130 degree (measured through the oil phase) so that the particles adsorb better on the oil-water interface and stabilize very efficiently the aqueous drops dispersed in the oily phase

37


23 Jamming in sheared foams and emulsions explained by critical instability of the films between neighboring bubbles and drops

N D Denkov 1 S Tcholakova 1 K Golemanov 1 A Lips 2

1 Laboratory of Chemical Physics amp Engineering Faculty of Chemistry Sofia University Bulgaria

2 Unilever Global Research Center Trumbull Connecticut 06611 USA

Phenomenon of foam and emulsion jamming at low shear rates is explained by considering the dynamics of thinning of the transient films formed between neighboring bubbles and drops After gradually thinning down to a critical thickness these films undergo instability transition and thin stepwise forming the so-called ldquoblack filmsrdquo which are only several nanometers thick and thereby lead to strong adhesion between the dispersed particles Theoretical analysis shows that such film thickness instability occurs only if the contact time between the bubblesdrops in sheared foamemulsion is sufficiently long which corresponds to sufficiently low (critical) rate of shear Explicit expression for this critical rate is proposed and compared to experimental data

38


24 A drop of spectroscopy

D Terwagne T Gilet N Vandewalle S Dorbolo

GRASP-Photopocircle FNRS Physics Department B5 University of Liegravege B-4000 Liegravege Belgium

Droplet coalescence in a liquid bath can be delayed by oscillating the surface of the bath vertically (frequency from 20 Hz to 400 Hz) the droplet bounces on the interface [12] A low viscous oil droplet is dropped on a high viscous oil bath We observe that the conditions for bouncing depends on the frequency more precisely we observe resonance when the eigenfrequency of the droplet is excited In some conditions droplet presents a non axi-symmetric mode of deformation That leads to a rotation of the drop and to a horizontal displacement [3]

[1] Y Couder E Fort C H Cautier A Boudaoud Phys Rev Lett 94 177801 2005 [2] N Vandewalle D Terwagne K Mulleners T Gilet S Dorbolo Phys Fluids 18 091106 2006[3] S Dorbolo D Terwagne N Vandewalle T Gilet New J Phys 10 113021 2008

39


25 Impact of drops of surfactant solutions

A Rozhkov 1 B Prunet-Foch 2 M Vignes-Adler 2

1 A Ishlinsky Institute for Problems in Mechanics Russian Academy of Sciences Moscow 119526 Russia

2 Universiteacute Paris-Est Laboratoire de Physique des Mateacuteriaux Diviseacutes et des Interfaces UMR8108 du CNRS Marne-la-Valleacutee France

The collisions of drops of surfactant solutions with small disk-like targets at high Reynolds and Weber numbers were studied both experimentally and theoretically Upon impact the drops very fast spread beyond the target in the shape of a thin lamella surrounded by a thick rim The use of a small disk as an impact target instead of the usual unbounded solid plate removes liquidsolid viscous drag since the number of influential factors decreases the interpretation of the observations and the modelling of the phenomenon are simplified As surfactant solutions are used the drop surfaces experience such a high rate of deformation upon impact that they become very far from thermodynamic equilibrium The drop outcome depends on the ability of the solution surfactants to restore or not the equilibrium during the collision Three surfactants were investigated the dioctyl sulfosuccinate sodium salt (DOS) that is characterized by a fast kinetics of adsorption of the surfactant molecules to the surface whereas the two others the didodecyl-dimethylammonium bromide (DDAB) and the trisiloxane oxypropylene polyoxyethylene (Silwett L77) are slow surfactants No significant difference between water and surfactant solutions was observed in the early stage of the impact ie when the circular liquid lamella was formed But the collapse stages were very different In particular the lamellas of DDAB and Silwett L77 solutions disintegrated due to the growth and subsequent coalescence of a number of holes spontaneously nucleated giving to the lamella a web-like structure prior to its break-up In contrast lamellas of DOS solutions collapse like water lamellas ie the external rim retracts and produces outwards-directed secondary jets Moreover addition of DOS significantly increased the maximum diameter and the lifetime of the lamella compared with pure water and other surfactant solutions A theoretical analysis shows that the observed instability effects in the lamella can be caused by Marangoni stresses and the increase of the size and lifetime of the lamella by the relaxation of the surface tension to equilibrium level

40


26 Micro-droplets of a dense suspension settling under gravity in a viscous fluid

M L Ekiel-Jeżewska E Wajnryb

Institute of Fundamental Technological Research Polish Academy of Sciences Śęwiętokrzyska 21 00-049 Warsaw Poland

Sedimentation of suspension droplets in a viscous fluid has been observed and investigated in many biological medical and industrial fluids Frequently it happens that suspended particles are not distributed randomly inside the droplet Sometimes they form regular structures aggregating It is of interest to understand how the settling process depends on the structure of the particle clusterTherefore in this work [1] we analyze theoretically and evaluate numerically velocities of small conglomerates of micro-particles settling under gravity in a fluid We investigate how the settling speed can be enhanced or decreased by a suitable modification of the configuration and orientation or by a change of the relative motion of the particles We also compare to velocity of clusters made of separated particles The accurate spherical multipole method of solving the Stokes equations is used with the controlled high order of the truncation [2]The mobility problem is solved velocities of the particles are evaluated and the dynamics is determined In particular we investigate a simple model of a conglomerate made of three identical spheres under gravity in a low-Reynolds number flow Stationary solutions of Stokesian dynamics are found For each of them its collective translation as well as rotation of individual spheres are specified Stable stationary configurations are found The results are also compared to the point-particle model For touching spheres such an approximation has to take into account additional constraint forces which do not allow the points which approximate the touching spheres to change the interparticle distance A chain-like system in which such separation is not allowed and each sphere always touches another one is important because of practical applications Its dynamics is investigated separately and the only stable equilibrium configuration is found Settling of a chain of beads which are free to rotate around their line of centres is shown to differ significantly from the motion of a rigid chain at the same configurationIt is shown that nonsymmetric microobjects orient while settling under gravity in a viscous fluid To analyze this process a simple shape is chosen a non- deformable lsquochainrsquo The chain consists of two straight arms made of touching solid spheres In the absence of external torques the spheres are free to spin along the arms It is demonstrated that the spinning beads speed up sedimentation by a small amount and increase the orientation rate significantly in comparison to the corresponding rigid chain It is shown that chains orient towards the V-shaped stable stationary configuration In contrast rods and star-shaped microobjects do not rotate

41


10485761048576 FIG 1 Conglomerates which rotate towards V-shaped orientation while settling under gravity

The hydrodynamic orienting found in this work is important for efficient swimming of microorganisms which are more dense than the fluid The results are also relevant for suspensions of chain-like conglomerates settling under gravity On the long time scale while reorienting takes place the suspension structure and settling speed may change leading to ordering of the sediment and possible applications to segregation and filtration techniques

[1] M L Ekiel-Jeżewska E Wajnryb Hydrodynamic orienting of asymmetric microobjects under gravity J Phys Condens Matter 2 2009 in print[2] B Cichocki ML Ekiel-Jeżewska E Wajnryb J Chem Phys 111 3265 1999

42


27 3D velocity measurement in an oscilating drop

V Palero 1 J Lobera 1 P Brunet 2 M P Arroyo 1

1 Grupo de Tecnologiacuteas Oacutepticas Laser (TOL) I3A-Universidad de ZaragozaC Pedro Cerbuna 12 50009-Zaragoza Espantildea

2 Laboratoire de Meacutecanique de Lille (LML) Boulevard Paul Langevin ndash Citeacute Scientifique 59655 Villeneuve drsquoAscq France

The purpose of this work is to show some of the results obtained in the collaboration between the Laboratoire Mecanique de Lille in France and the Optical Laser Technology group in Spain

The main objective of this collaboration was to study the three-dimensional movement inside an oscillating liquid drop by means of holographic techniques A liquid drop was squeezed between two parallel glass plates separated a distance of 2 mm The glass was treated to be slightly hydrophobic (contact angle around 90ordm with hysteresis around 10ordm) The plates were attached to the vertical axis of a mechanical shaker connected to a function generator that produces vibrations in a wide range of frequencies A scheme of this set-up is shown in figure 1The drop was illuminated from below with an expanded laser beam A mirror redirected the light to a high speed camera Digital in-line holograms were recorded with the droplet oscillating at a frequency of 555 Hz As the vertical acceleration is increasing different transitions can be observed for a flat squeezed drop Firstly the unpinning of the contact line (figure 2) and at higher acceleration the drop loses its axial symmetry and takes the shape of a star (with 3 to 6 branches depending on the size of drop figure 3) The hologram reconstruction and analysis is currently under way We expect to measure the 3D flow inside the drop in order to show a qualitative change in the inner flow each time the drop transits to another regime at growing vibration amplitude

Figure 1 Figure 2 Figure 3

43


PostersPosters

44


1 Diffusion properties of crystalline microbubbles

A J Meagher A van der Net D Weaire S Hutzler

School of Physics Trinity College Dublin University of DublinDublin Ireland

We report on the evolution of the top layer of crystalline microfoam due to the slow diffusion of gas For foam produced with nitrogen gas and detergent solution we observe a self-organising effect Due to the escape of gas from the bubbles in the top layer bubbles shrink and create spaces for the bubbles of the lower layers to interpose themselves at the top This occurs irregularly but finally a newly ordered bidisperse top layer is formed This process can be followed for several episodes of elimination of the top layer Compared with diffusion of a single bubble or monodisperse monolayers on top of a liquid pool the diffusion is much faster This may be accounted for by the extra buoyancy force leading to a larger exposure of the bubbles at the surface Samples composed of bubbles containing slow diffusing perfluorhexan (PFH) dissolved in nitrogen show a different behaviour Due to the partial pressures invoked by thepresence of the PFH nitrogen from the atmosphere diffuses into the top layer of the foam causing an increase in the average bubble diameter in this layer In this case no bubbles are observed to emerge from the second layer

45


2 Synthesis of metal spheres obtained in an anodic arc plasma in high vacuum

C Surdu-Bob M Badulescu

National Institute for Laser Plasma and Radiation Physics Low temperature plasma Laboratory POBox MG-36 077125 Romania

This paper presents an original arc plasma-based technique which has recently shown great potential for the synthesis of metal nano and micro spheres The Thermionic Vacuum Arc (TVA) plasma is a PVD technique which uses an electron beam and a high voltage biased anode The basic principle of TVA is ignition of an arc plasma in the vapours of the material of interest here a metal The metal is melted in a crucible (the anode) by bombardment with high-energy electrons emitted by a hot filament Due to the high voltage applied on the anode (1-4 keV) the electrons evaporate the metal and initiate an arc plasma by collisions with the as created metal vapours Typical arc currents 1 - 25 AIt should also be mentioned that no buffer gas or catalyst is needed the plasma source only works under vacuum of 10-6 torrIn Fig 1 an image of a TVA plasma ignited in Cu vapours is shown as example As can be observed in this figure the TVA plasma is localized it does not fill the chamber

Figure 1 The TVA plasma ignited in Chromium vapours

The main application of this plasma source is deposition of thin films We have recently produced perfectly spherical particles of different metals using TVAUnder certain plasma conditions described in the paper metal nano and micro spheres of a large range of sizes from under 1 micron to hundreds microns were obtained As the TVA works under high vacuum the spherical particles obtained contain pure metal only The TVA is a promising technique for the synthesis of micromaterials

46


3 Surface dilatational rheological properties of surfactant mixtures

D Dimitrova 1 F Ravera 2 L Liggieri 2 S Tcholakova 1 K Marinova 1


2 CNR-Istituto per lrsquoEnergetica e le Interfasi (IENI) Genova Italy

The surface dilatational rheological properties of surfactant mixtures containing anionic surfactant zwitterionic surfactant and fatty acids (myristic or lauric) were measured by oscillating bubble method [1] The effects on the surface dilatational modulus of the type of fatty acid its concentration presence of glycerol and temperature were studied The experimental results show that the surface dilatational modulus depends strongly on the presence and chain-length of the fatty acid and on temperature Relatively weak dependence on the concentration of fatty acid in the mixture was found The observed high surface modulus in the presence of fatty acids is explained with the formation of surface condensed phase of fatty acid molecules in the surfactant adsorption layer The increase of temperature above the surface phase transition leads to significant decrease of the surface modulus The measured dependence of the surface loss modulus on the frequency of oscillation was incorporated in the theoretical model for predicting the rheological properties of bulk foams stabilized by the surfactant mixtures studied [2] Very good agreement between the predicted and measured dependence of the foam viscous stress on the foam shear rate is found

[1] F Ravera M Ferrari E Santini L Liggieri ldquoInfluence of Surface Processes on the Dilational Visco-Elasticity of Surfactant Solutionsrdquo Adv in Colloid and Interface Sci117 75-100 2005 [2] S Tcholakova N D Denkov K Golemanov K P Ananthapadmanabhan A Lips ldquoTheoretical model of viscous friction inside steadily sheared foams and concentrated emulsionsrdquo Phys Rev E 78 011405 2008

47


4 Dilational viscoelasticity measurement by the oscillating bubbledroptechniques using a capillary pressure tensiometer

F Ravera 1 L Liggieri 1 M Ferrari 1 G Loglio 2 P Pandolfini 2

1 CNR - Istituto per lrsquoEnergetica e le Interfasi Genova-Italy2 Department of Organic Chemistry University of Florence Italy

The Capillary Pressure Tensiometry (CPT) can be used for dilational rheological studies of adsorbed layers according to the oscillating drop bubble method [1] where a pressure signal is acquired as response to harmonic perturbations of the dropbubble interfacial area allowing for an indirect determination of the dilational viscoelasticity versus frequencyThe working principle of this tensiometer exploits in fact the relationship between the pressure difference between two phases separated by a curved interface its curvature radius and the interfacial tension which is the Laplace equationThe principal critical aspects of this technique are here analyzed which mainly concern the calculation of the real and imaginary part of the dilational viscoelasticity from the directly acquired experimental dataSuch calculation requires a specific experiment theory accounting also for the compressibility of the closed part of the experimental cell and for the fact that the acquired pressure is a superposition of different fluid dynamic contributions An extension of a previously proposed approach [23] is here presented where the pressure inside the measurement cell is theoretically calculated considering the contributions not only of the capillary pressure but also of the Poiseuille pressure due to the fluid motion through the capillary and of hydrodynamic inertial terms Two different tensiometer configurations are here analyzed and for both a simplified modelling of the experimental cell is assumed where the compressibility is simulated by an equivalent gas volume evaluable by side experimentsSimulations of experimental pressure signal are calculated as a function of specific experimental parameters in order to evaluate their influence on the measurement and as a tool to improve the effectiveness of the apparatus and the experimental methodology Moreover in order to validate the assumptions of this approach specifically acquired experimental data are analysed

[1] VI Kovalchuk J Kraumlgel EV Aksenenko G Loglio L Liggieri in ldquoNovel Methods to Study Interfacial Layersrdquo Moumlbius D Miller R Eds Studies in Interface Science Series Elsevier-Amsterdam11485-516 2001[2] L Liggieri M Ferrari D Mondelli F Ravera Fararday Discussions 125 129 2005[3] F Ravera M Ferrari E Santini L Liggieri Adv in Colloid and Interface Sci 75 117 2005

48


5 Spectral studies of medicines to be delivered in microdroplets form

M Dicu 1 AStaicu 1 A Smarandache 1 I R Andrei 1 M Ferrari 2L Liggieri 2 L Frunza 3 M L Pascu 1

1 National Institute for Laser Plasma and Radiation Physics Laser Department POBoxMG-36 077125 Romania

2 CNR- Institute for Energetics and Interphases Via De Marini 6 I-16149 Genova Italy3 National Institute of Materials Physics POBox Mg-07 077125 Magurele Romania

The paper reports on the modifications produced in anthracycline antibiotic compounds at molecular level by exposure to coherent uncoherent optical radiation the aim is to obtain more efficient antibiotics with cytostatic action by modifying their molecular structures in order to improve their therapeutic effect and to make them able to fight acquired multi drug resistance (MDR)Adriamycin often known as doxorubicin is a widely used anthracycline with efficient chemotherapeutics applications Doxorubicin has characteristic ultraviolet and visible absorption spectra as well as fluorescence spectra due to the nature of the chromophore portion in its structure We use UV-VIS Absorption Spectroscopy and Fluorescence Spectroscopy in order to investigate the effect of concentrationradiation on doxorubicin absorptionfluorescence spectra The results show that doxorubicin spectra are concentration dependent and highly reactive at exposure to nonionising radiation especially at low concentrations The polimerization degree value which was 184 indicates the presence of two molecular species in doxorubicin solutions beginning with 10-4 M concentrationThe photo-transformation of doxorubicin analysed samples shows that the molecules are photo-reactive and their therapeutic effect may be improved by exposure to UV-VIS radiationAnother issue to approach in order to develop a more efficient treatment is the medicines delivery procedures to targets We report results on generation of droplets in perspective micro- and nano-droplets containing doxorubicin to provide a new and more efficient vector for the transport of the medicine to targets within the organism The measurements show that the equilibrium values of the ST are constant in time and equal for all drugs concentrations The values are close to pure water ones ndash ie at the drug concentrations which were used the adsorption effects at water-air interface are absent or very low and the distribution of drug molecules in droplet is uniform and remains constant in time The equilibrium values of the contact angles of the droplets on hydrophobic surfaces do not depend on the solutions concentrations and are nearly as high as for the pure water


49


6 Wetting of solvents for drug delivery on superhydrophobic surfaces

M Ferrari 1 L Liggieri 1 F Ravera 1 M L Pascu 2 M Dicu 2

1CNR-Istituto per lEnergetica e le Interfasi via De Marini 6 16149 Genova Italy2National Institute for Laser Plasma and Radiation Physics Str Atomistilor 409 077125

Magurele Romania

Very low energy surfaces known as superhydrophobic or ultrahydrophobic with a water-contact angle (CA) greater than 150deg have raised great interest both in fundamental and application research fields Different methods have been proposed to enhance the water repellence by acting on the chemistry of the coating and on the surface topography Water soluble drugs have shown very low or negligible surface activity and wetting properties on superhydrophobic substrates In this work superhydrophobic surfaces have been prepared and the effect of single and mixed solvents suitable for drugs delivery purpose in presence of surfactant solutions on the wetting of these surfaces in air-water and oil-water systems has been investigated

[1] M Ferrari F Ravera L Liggieri Wetting of Single and Mixed Surfactant Solutions on Superhydrophobic Surfaces Journal of Adhesion Science and Technology 23 483ndash492 2009[2] M Ferrari Surfactants adsorption at hydrophobic and superhydrophobic solid surfaces in Contact angle Wettability and Adhesion Ed KL Mittal VSP 5 2008

50


7 Antibubbles liquid onions and mayonnaise droplets

N Vandewalle S Dorbolo T Gilet D Terwagne

GRASP Dept of Physics B5a University of Liegravege B4000 Liegravege Belgium

In this poster we emphasize our long series of experiments proving that the physical processes along fluid interfaces can be exploited for creating unusual fluidic objects We report new fluidic objects so-called ldquoliquid onionsrdquo and ldquomayonnaiserdquo droplets The study starts from the observation of antibubbles exhibiting unstable liquid-air-liquid interfaces We show that the lifetime of such a system has the same origin as floatingcoalescing droplets on liquid surfaces By analyzing such behaviours we created droplets bouncing on a liquid bath The methods and physical phenomena collected in this poster provide a basis for the development of a discrete microfluidics

51


8 Contribution of droplet explosion to charge release in laser-assisted condensation

S Henin Y Petit D Kiselev J Kasparian J P Wolf

University of Geneva ndash GAP Biophotonics 20 Rue de lrsquoEcole de Medecine CH 1211 Genegraveve Switzerland

Artificial triggering of water condensation in clouds hence of rain would be of high benefit for the local populations and economy in those lands who suffer of low precipitation rates we evaluate the chance to induce this phenomenon by means of a femtosecond laser beam As condensation nuclei required for water condensation1 we consider pre-existing water droplets on laser path We estimate through a reduced-scale experiment the contribution of laser-induced droplets explosion to the charge release along the laser-generated plasma channel2 By comparing this contribution to that of the laser beam itself we finally show that this path of charge release cannot be considered as the dominant mechanism in laser-assisted water nucleation

[1] HR Pruppacher JD Klett Microphysics of Clouds and Precipitation Kluwer Academic Pub 1996[2] J Kasparian JP Wolf Opt Exp 16 466-493 2008

52


9 Preliminary study of vancomycin on a normal epithelial retinal cell line

A Manea 1 S Kevorkian 1 A Dinischiotu 1 M Dicu 2 M L Pascu 2 M Costache 1B Carstocea 3


2 University of Bucharest Department of Biochemistry and Molecular Biology POBox 050107 str MKogalniceanu 36-46 Romania

3 University of Medicine and Pharmacy bdquoCarol Davilardquo Ophthalmplogy Clinic Bucharest Romania

Vancomycin is an antimicrobial glycopeptide active against almost all clinically significant Gram positive cocci and is frequently used in severe corneal infections In this preliminary study we studied the effect of non-irradiated and UV-VIS irradiated vancomycin on the ATCC cell line ARPE-19 which represents the normal retinal pigmented epithelium We used seven concentrations of vancomycin from 10macr10M to 10macr4M After a treatment of four hours the whole cytotoxic effect of doxorubicin in ARPE -19 cell line was evaluated using the tetrazolium based MTT assay The results obtained in case of non-irradiated vancomycin did not show a major cytotoxic effect In case of irradiated vancomycin we observed a small proliferation of the cells This study will be continued on a tumoral epithelial cell line in order to investigate the antitumoral effect of this substance

53


10 Wettability properties of textile materials by water droplets optically visualized

T Beica I Zgura L Frunza L C Nistor C Morosanu

National Institute of Materials Physics POBox Mg-07 077125 Magurele Romania

This contribution presents some results obtained in characterizing the wettability properties of glass fibre fabric materials by plasma treatments which were at hand in our laboratory Magnetron sputtering (MS) plasma was used in this aim The glass fibre fabric was commercially available Glass reference plates to follow the layer thickness and composition were used as well Layers were deposited onto fabric samples as follows indium-tin oxide (ITO) and hydroxyapatite (HA) The gas atmosphere in the deposition chamber was given by argon or argon and oxygen The target was made from the material to be deposited Complex methods were applied to characterize the layers deposited Diffuse reflectance and specular reflectance sets-up were used in the IR and UV-vis domains Kubelka-Munk function was applied to quantitatively interpret the obtained spectra When appropriate Scanning Electron Microscope (SEM) images were taken in order to establish the morphology of the layersWettability of the fabric samples was checked by studying the behaviour of a water droplet onto the fabric surface Visualization techniques allowed a comparison of the fabric samples before and after the treatments Thus the samples were obliquely (45o) illuminated from a white cold source Water droplets were introduced using a syringe needle The droplet was followed by optical microscope at 45o the receiver being a Nikon Coolpix 2000 camera (collecting 5 imagess) For vizualisation at large angles a CCD camera has been used We found from the SEM images taken at the same magnification that the ITO deposition is less uniform than the HA depositionDroplet advance and wetting images allowed determining the corresponding angles We found that the wetting angle depends on the surface treatment and the advance angle is higher than the wetting one as expectedCollecting the images of the water droplets onto the woven of glass fibres during a time period after their deposition the wetting kinetics and the degree of water spreading onto the woven covered with the mentioned layers was evaluated Dried samples were obtained by exposing the samples at the room atmosphere for several hours We observed the formation of a persistent spot at the water contact with the woven The kinetic curves were sigmoids The wetting is faster on the untreated fabric than on those with ITO or HA depositions The most efficient treatment was chosen on the basis of these observations it was the ITO treatment under the specified conditions

54


11 Atomization of pharmaceutical solutions

T R Sosnowski


Selected issues of production of micrometer-sized droplets in medical inhalers are discussed The influence of dynamic surface tension on atomization efficiency and the size distribution of droplets produced with a commercial inhaler is studied experimentally for selected medicinal formulation typically used in inhalation therapies The result of the study suggest that the dynamic value of the surface tension of the atomized solution ie the value attained in the millisecond time-scale is a significant parameter determining the quality of aerosol emitted from the medical inhaler which has an impact on the outcome of inhalation therapy

55


12 Surface tension of drug solutions

T Beica 1 I Zgura 1 L Frunza 1 I Andrei 2 M Dicu 2 M L Pascu 2

1 National Institute of Materials Physics POBox Mg-07 Magurele Romania2 National Institute for Laser Plasma and Radiation Physics Magurele Romania

This contribution presents some results regarding the determination of the superficial tension and contact angle as important characteristics of a series of ophthalmic solutions The purpose of the measurements is to determine the influence of some factors (the chemical nature and the structure of the molecules concentration and their modification by irradiation) upon the mentioned properties of the surfaceDoxorubicin and vancomicine (drugs) are studied in aqueous solutions with 10-3 and 10-6 ML concentrations Both substances are structurally related with the alizarine dye Doxorubicin is known to be hydrophobic and exhibiting low water solubilityTo prevent decomposition of the dissolved substance the solutions were kept refrigerated and protected from light (bdquoas suchrdquo solutions) and degasing was accomplished by low vacuum and mild shaking at room temperature (bdquodegasedrdquo solutions)To determine the superficial tension it was used the pendant drop method with its well-known balance relationship between gravitational and surface forces applied to a drop at the end of a capillary tube The temperature of the surface temperature (at physiologic temperatures or close to them) and time dependence of the surface tension was determined The contact angle was measured for a hydrophobic teflon substrate Both superficial tension and contact angle were measured using a commercial DSA 100 device (from Kruss) The density was measured using a DMA4500 densimeter (from Paar)The behaviour of the solutions was compared to the solvent alone (water) It was observed a nonlinear temperature dependence of the surface temperature of pure water in accordance with the data published in literatureThe temperature dependence of the superficial tension of the solutions is the expected one ie it decreases with increasing temperatureThe time variation of the surface tension (for the bdquoas suchrdquo solutions) show at constant temperature a decrease in the surface tension followed by an equilibrium settling which is faster for more concentrated solutions This decrease in superficial tension in time could be linked to various factors which include diffusion coefficient and its temperature variation the adsorption equilibrium at the air water interface and the molecule aggregation equilibrium Similar behaviours have been observed for other organic substancesThe importance of the disolved gases in these measurements was revealed

Aknowledgements The authors are grateful to Romanian Ministry of Education and Research for the financial support by PALIRT Project

56


13 Characterization of microdroplets which contain solutions of medicines

I R Andrei 1 M Ferrari 2 L Liggieri 2 M Dicu 1 V Nastasa 1 M L Pascu 1

1 National Institute for Lasers Plasma and Radiation Physics PO Box MG-36str Atomistilor 409 077125 Magurele Romania

2 CNR Institute for Energetics and Interphases Via De Marini 6I-16149Genova Italy

In the recent years the malignant tumours revelled the development of the acquired resistance to treatment with standard cytostatics which lead to new attempts for finding alternatives to the existing medicines and treatment procedures There are three alternate solutions developing new classes of medicines strengthening the effects of existing cytostatics by modifying their molecular structures to improve their photosensitizing properties approaching new medicines delivery procedures to targets in order to develop a more efficient treatment Usually the development of new classes of medicines is time consuming and too expensive It is possible that the resistance of the malignant tumours differs from a medicine class to another From this point of view the last two solutions are an alternative to the first one because they are cheaper and can be applied on a relative large number of medicines Along the line of strengthening the effects of existing cytostatics by modifying their molecular structures it was investigated the compound encoded BG1120 [1] having the formula 18 bis [thio(2-N-N amino-ethyl] diethylaminoethyl)] 9methyl 45- diazantracene its molecules exhibited important modifications after exposure at uncoherent optical and laser radiation (the solutions were prepared in distilled water and the pH remained neutral) It was evidenced that the exposures to (coherent) optical radiation of the BG1120 solutions produce modifications in the pyridinium compounds at molecular level and these slight modifications of the molecules made them more efficient in healing pseudotumour eye tissues [2] As for the new medicines delivery procedures to targets we report results regarding the wetting properties of droplets containing BG1120 unexposed to opticallaser radiation The measurements about the surface tension and contact angles (on hydrophobic and superhydrophobic surfaces [3]) gave information on the BG1120 molecules distribution in the droplets which is important in evaluating irradiation efficiencies it is also important for the studies on the compatibility between droplets containing medicines and some materials which are of interest for droplet instrumentation The reported results are useful for further studies on generation of droplets which contain medicines and which are protected with respect to the surrounding media to reach the target tissues

[1] F Ungureanu L Voicu IR Andrei The modification of phenyl-pyridine compounds under UV irradiation FTIR investigation Journal of Optoelectronics and Advance Materials 8 1 315-318 2006[2] R A Pascu M Trifu M Dumitrescu A Mahamoud A Staicu B Carstocea MLPascu In vivo studies of the effects of alkyl substituted benzo[b]pyridinium compounds exposed to optical radiation Romanian Reports in Physics 60 3877 ndash 884 2008 [3] M Ferrari FRavera L Liggieri Preparation of a superhydrophobic surface by mixed inorganic-organic coating Applied Physics Letters 88 203125 2006

57


14 Strong hybrid electro-gravity-induced capillary attraction between charged particles at a fluid interface

M P Boneva K D Danov N C Christov P A Kralchevsky

Laboratory of Chemical Physics amp Engineering Faculty of Chemistry Sofia University 1 J Bourchier Blvd 1164 Sofia Bulgaria

We investigated experimentally and theoretically the motion of spherical glass particles of radii 240 ndash 310 m attached to a tetradecane-water interface [12] Pairs of particles which are moving toward each other under the action of lateral capillary force are observed by optical microscopy The purpose is to check whether the particle electric charges influence the particle motion and whether an electric-field-induced capillary attraction could be detected The particles have been hydrophobized by using two different procedures which allow one to prepare charged and uncharged particles To quantify the hydrodynamic viscous effects we developed a semiempirical quantitative approach whose validity was verified by control experiments with uncharged particles An appropriate trajectory function was defined which should increase linearly with time if the particle motion is driven solely by the gravity-induced capillary force The analysis of the experimental results evidences for the existence of an additional attraction between two like-charged particles at the oil-water interface [2] This attraction exceeds the direct electrostatic repulsion between the two particles and leads to a noticeable acceleration of their motion Its long-range character indicates that this interaction is a kind of hybrid electro-gravity-induced lateral capillary force

[1] K D Danov P A Kralchevsky M P Boneva Langmuir 22 2653ndash2667 2006[2] M P Boneva N C Christov K D DanovP A Kralchevsky PCCP 9 6371ndash6384 2007

58


15 FASES an instrument for Fundamental and Applied Studies of Emulsions Stability

L Liggieri 2 G Loglio 3 R Miller 4 A Steinchen 5 M Antoni 5 M Roziere 5 D Clausse 6 L del Gaudio 7 C Dalmazzone 8 T Karapantsios 9 V Dutschk 10 R G Rubio 11

G Picker 12 T Dewandre 1 O Minister 1 S Vincent-Bonnieu 1

1 European Space Agency-ESTEC Noordwijk The Netherlands2 Istituto per lrsquoEnergetica e le Interfasi - CNR Genova Italy

3 Dip di Chimica Organica Universitagrave di FirenzeSesto Fiorentino Italy4 Max-Planck Inst fuumlr Kolloid und Grenzflaumlchenforschung GolmPotsdam Germany

5 Faculteacute de Science Aix-Marseille Universiteacute Marseille France6 Deacutep Genie Chimique Universiteacute de Technologie Compiegravegne France

7 ENI EampP San Donato Milanese Italy8 Institute Francais du Peacutetrole Riel Malmaison France

9 Dept Chemical Eng Aristotle University Thessaloniki Greece10 Leibnitz Inst fuumlr Polymer Forschung Dresden Germany

11 Dept Quimica Fisica Universidad Complutense Madrid Spain12 EADSAstrium Friedrichshafen Germany

This paper is about the FASES Experiment Container an experiment on emulsion stability developed and built by EADSAstrium for the European Space Agency (ESA) FASES EC is one of the 2 experiments developed for the project on Emulsion Stability ldquoFASESrdquo(3) The FASES EC will be integrated on orbit into the Fluid Science laboratory (FSL) inside the Columbus module on-board the ISS on December 2009The emulsions and foams are present in everyday life milk cream oil However the mechanisms of stabilisation are complicated both particles and surfactant are widely involved The stability is also an important challenge for many industries food cosmetic pharmaceutics but also for waste water treatment or crude oil recovery where separation phase phenomena occur FASES will be focused of course on the emulsion and dropdrop interactions Progresses will be done on the characterisation of the elementary mechanisms of emulsion dynamic as well as the development of models for the evolution of the droplets size distribution (1) The FASES EC experiment developed for the scientists is composed of two experiments in the same container1 A calorimeter which is designed for investigations on opaque emulsions Making the correlation between droplet under cooling and size one obtains the coalescence time and the droplet size distribution2 A Scan tomography microscope designed for investigations on transparent emulsions (2) Software will reconstruct the 3D distribution of droplets from the scan tomography giving dropdrop interactions and drop dynamics (ripening aggregation coalescence) We will present briefly scientific objectives of the experiments the ground experiments modelling and a description of the module

59


Figure Water Paraffin oil emulsion by the scantomography microscope

Keywords Emulsion Interfacial rheology Adsorption Surfactant Nanoparticles

[1] L Liggieri et al Microgravity Science and Technology Journal 18 2006[2] M Antoni et al Colloid and Surfaces A 2007 in press[3] MAP AO 99-052 L Liggieri G Loglio A Steinchen M Antoni R Miller D ClausseL Del Gaudio C DalmazzoneT Karapansios V Duschk M Velarde ESA SP-1290 2005[4] D Clausse F Gomez C Dalmazzone C Noik JColloid Interface Sci 287 2 694-703 2005

60


Author indexAuthor index

A GAksenenko E V 16 Gilet T 38 50 Moskal A 18Albert F 31 Golemanov K 37 Muradoglu M 25Andrei I R 27 48 55 56 Grigoriev D O 34Antohe S 30 Guido S 17 NAntoni M 15 34 Năstasă V 27 56Arroyo M P 42 H Niecikowska A 22

Henin S 51 Nistor L C 53B Hristova D 36Bădulescu M 45 Hutzler S 44 PBasheva E S 20 Palero V 42Beauloye S 14 I Pandolfini P 16 47Beică T 27 54 55 Ion L 30 Pascu M L 27 48 49 52 55 56Bonacina L 26 Ivanov I B 20 PetitY 51Boneva M P 57 Prunet-Foch B 39Brunet P 42 J

Javadi A 16 RC Ralston J 19 22Caserta S 17 K Ravera F 16 19 46 47 49Cacircrstocea B 53 Karapantsios T 21 58 Rozhkov A 39Christov N L 57 Kasparian J 51Costache M 52 Kevorkian S 52 SCouder Y 23 Kiselev D 26 54 Sadlej K 28

Kostoglou M 21 Samin S 35D Kovalchuk V I 16 Santini E 19Danov K D 57 Kraumlgel J 16 34 SchmidtM 31 32Denkov N 36 37 Kralchevsky P A 57 Schmitt-RoziegraveresM 15 34Dicu M 48 49 52 5556 Krasowska M 22 Smarandache A 48Dimitrova D 46 Kreutzer M 33 Sosnowski T R 54Dinischiotu A 52 Staicu A 48Dominici C 15 L Surdu-Bob C 45Dorbolo S 38 50 Liggieri L 1619 3446 47 4849 5658 Szczepanowicz K 24Dronka-Goacutera D 24 Limage S 15 Szyk-Warszyńska L 24Dutschk V 19 58 Lips A 37

Lobera J 42 TE Loglio G 16 19 4758 Tcholakova S 36 37 46Eddi A 23 Terwagne D 38 50Ekiel-Jeżewska M L 2840 M Ticoş C 27Enculescu I 30 Malysa K 22 Tomaiuolo G 17

Manea A 53 Tsori Y 35F Marinova K G 20 46Ferrari M 19 47 48 49 56 Meagher A J 44 VFornasiero D 19 Miller R 16193458 Vignes-Adler M 39Fort E 23 Moret M 26 Vincent-Bonnieu S 153458Frunză L 48 53 55 Moroşanu C 53 Van der Net A 44

Vandewalle N 38 50

61


WWajnryb E 28 40Warszynski P 24Weaire D 44Weigl M 32Whitby C 19Wolf J P 26 51

ZZgură I 53 55

62


Participants listParticipants list

Adler Michele France adleruniv-mlvfr

Albert Florian Germany falbertblzorg

Andrei Ionuţ Relu Romania ionutandreiinflprro

Antohe Stefan Romania santohesolidfizicaunibucro

Antoni Mickael France mantoniuniv-cezannefr

Beauloye Stephanie Belgium sbeauloyecostesforg

Beică Traian Romania tbeicainfimro

Boneva Mariana Bulgaria mblcpeuni-sofiabg

Cacircrstocea Benone Romania bencarstoceayahoocom

Cojocaru Marian Romania mariancojocaruinflprro

Costache Marieta Romania marietacostacheyahoocom

Couder Yves France couderlpsensfr

Dănăila Leon Romania leondanailaneurochinfo

Denkov Nikolai Bulgaria ndlcpeuni-sofiabg

Dicu Mădălina Romania madalinadicuinflprro

Dimitrova Dora Bulgaria dtlcpeuni-sofiabg

Dinischiotu Anca Romania dinischiotuyahoocom

Ekiel-Jeżewska Maria Polonia mekielipptgovpl

Enculescu Ionuţ Romania santohesolidfizicaunibucro

Ferrari Michele Italy mferrarigeienicnrit

Frunză Ligia Romania lfrunzainfimro

Frunză Ştefan Romania lfrunzainfimro

Ganea Paul Romania paulganeainfimro

Guido Stefano Italy steguidouninaitHenin Stefano Switzerland stefanoheninunigech

63


Ion Lucian Romania santohesolidfizicaunibucro

Javadi Aliyar Germany aliyarjavadimpikgmpgde

Karapantsios Thodoris Greece karapantchemauthgr

Kevorkian Steliana Romania stelyana2004yahoocom

Kiselev Denis Switzerland deniskiselevunigech

Kreutzer Michiel The Netherlands mtkreutzertudelftnl

Liggieri Libero Italy lliggierigeienicnrit

Malysa Kazimierz Poland ncmalysacyf-kredupl

Manea Adina Romania adina_maneayahoocom

Marin Mihaela Romania mihaelamarininflprro

Marinova Krastanka Bulgaria kmlcpeuni-sofiabg

Meagher Aaron Ireland meagheajtcdie

Medianu Rareş Romania raresmedianuinflprro

Moldovan Rodica Romania mrodiinfimro

Moskal Arkadiusz The Netherlands moskalichippwedupl

Mugele Frieder The Netherlands fmugeleutwentenl

Muradoglu Metin Turkey mmuradoglukuedutr

Palero Virginia Spain palerounizares

Pascu Alexandru Romania alexpascuinflprro

Pascu Mihail Romania mihaipascuinflprro

Pascu Ruxandra Romania ruxandra_pascuyahoocouk

Ravera Francesca Italy fraverageienicnrit

Romaniţan Mihaela Romania oana_pascu_romanitanyahoocom

Romaniţan Mircea Romania mircea_romanitanyahoocom

64


Sadlej Krzysztof Poland ksadlejipptgovpl

Schmitt-Roziegraveres Murielle France muriellerozieresuniv-cezannefr

Smarandache Adriana Romania adrianasmarandacheinflprro

Sosnowski Tomasz Poland sosnowskichippwedupl

Staicu Angela Romania angelastaicuinflprro

Stăncalie Viorica Romania vioricastancalieinflprro

Surdu Bob Cristina Romania cristinasurdubobplasmacoatingsro

Tcholakova Slavka Bulgaria sclcpeuni-sofiabg

Terwagne Denis Belgium dterwagneulgacbe

Ticoş Cătălin Romania catalinticosinflprro

Tsori Yoav Israel tsoribguacil

Vandewalle Nicolas Belgium nvandewalleulgacbe

Vincent-Bonnieu Seacutebastien The Netherlands sebastienvincent-bonnieuesaint

Warszynski Piotr Poland ncwarszycyf-kredupl

Weigl Markus Germany mweiglblzorg

Zgură Irina Romania irinazgurainfimro

65




1CNR-Istituto per lEnergetica e le Interfasi via De Marini 6 16149 Genova Italy

[1] HR Pruppacher JD Klett Microphysics of Clouds and Precipitation Kluwer Academic Pub 1996

A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56


Romanian Parliament House Romanian Parliament House BucharestBucharest

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S Beauloye




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A Moskal



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Fig1 Basic scheme




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F Albert M Schmidt



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M Weigl M Schmidt



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PostersPosters

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Magurele Romania



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T R Sosnowski



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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






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S Beauloye




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A Moskal



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M Muradoglu





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Fig1 Basic scheme




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3670 3680 3690 3700 3710 3720

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7580 7590 7600 7610 7620 7630

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F Albert M Schmidt



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M Weigl M Schmidt



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Y Tsori S Samin



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PostersPosters

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Magurele Romania



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T R Sosnowski



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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56


LocationsLocations


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Bucharest




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Tel 4021 457 44 89 Fax 4021 457 42 43















7














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S Beauloye




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16









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A Moskal



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M Muradoglu





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Fig1 Basic scheme




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3670 3680 3690 3700 3710 3720

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7580 7590 7600 7610 7620 7630

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F Albert M Schmidt



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M Weigl M Schmidt



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Y Tsori S Samin



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PostersPosters

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Magurele Romania



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T R Sosnowski



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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







4










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Bucharest




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Tel 4021 457 44 89 Fax 4021 457 42 43















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S Beauloye




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A Moskal



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M Muradoglu





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Fig1 Basic scheme




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325

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3670 3680 3690 3700 3710 3720

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x

x


7580 7590 7600 7610 7620 7630

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F Albert M Schmidt



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M Weigl M Schmidt



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Y Tsori S Samin



36






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PostersPosters

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Magurele Romania



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T R Sosnowski



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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56










5







Bucharest




6



Tel 4021 457 44 89 Fax 4021 457 42 43















7














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12


















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S Beauloye




15








16









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A Moskal



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24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

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30

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35

3670 3680 3690 3700 3710 3720

175

20

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z

z

x

x


7580 7590 7600 7610 7620 7630

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20

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30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



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Y Tsori S Samin



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PostersPosters

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49





Magurele Romania



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T R Sosnowski



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56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







Bucharest




6



Tel 4021 457 44 89 Fax 4021 457 42 43















7














8












9














10














11









12


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

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30

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29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

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30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









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Y Tsori S Samin



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PostersPosters

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Magurele Romania



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T R Sosnowski



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56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56















7














8












9














10














11









12


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

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30

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29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

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25

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30

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35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



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Y Tsori S Samin



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PostersPosters

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Magurele Romania



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T R Sosnowski



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56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56














8












9














10














11









12


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

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25

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30

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35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









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35



Y Tsori S Samin



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43


PostersPosters

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Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56












9














10














11









12


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

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35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

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25

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30

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35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









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Y Tsori S Samin



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PostersPosters

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Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56














10














11









12


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

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25

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30

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35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









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35



Y Tsori S Samin



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PostersPosters

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48








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Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56














11









12


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

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30

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35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






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43


PostersPosters

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48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56









12


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

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35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






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43


PostersPosters

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48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56


















13



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







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41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



14



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







39







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41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



S Beauloye




15








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







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40






41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








16









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







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40






41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56









17






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







39







40






41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






18



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







39







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41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



A Moskal



19









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







39







40






41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56









20






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







39







40






41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






21






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

325

35



30

z x






31



F Albert M Schmidt



32



M Weigl M Schmidt



33









34








35



Y Tsori S Samin



36






37







38







39







40






41





42









43


PostersPosters

44






45








46








47







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






22







23








24






25




M Muradoglu





26









Fig1 Basic scheme




27







28






-30 -20 -10 0 10 20

175

20

225

25

275

30

325

35

3670 3680 3690 3700 3710 3720

175

20

225

25

275

30

325

35

29

z

z

x

x


7580 7590 7600 7610 7620 7630

175

20

225

25

275

30

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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

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Eddi A 23

F

Ferrari M 19 47 48 49 56







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Fig1 Basic scheme




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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








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M Muradoglu





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Fig1 Basic scheme




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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






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M Muradoglu





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Fig1 Basic scheme




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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56




M Muradoglu





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Fig1 Basic scheme




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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56









Fig1 Basic scheme




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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






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Vandewalle N 38 50

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ZZgură I 53 55

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65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56


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Vandewalle N 38 50

61



ZZgură I 53 55

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63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






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F Albert M Schmidt



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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56









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Vandewalle N 38 50

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ZZgură I 53 55

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65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



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Vandewalle N 38 50

61



ZZgură I 53 55

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65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






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Vandewalle N 38 50

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ZZgură I 53 55

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65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







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Vandewalle N 38 50

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ZZgură I 53 55

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A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56





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Magurele Romania



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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56









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Magurele Romania



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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56


PostersPosters

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Magurele Romania



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Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






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47







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Magurele Romania



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51







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53






54



T R Sosnowski



55







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57







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59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








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47







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49





Magurele Romania



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51







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53






54



T R Sosnowski



55







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57







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59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








47







48








49





Magurele Romania



50






51







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53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







48








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







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57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








49





Magurele Romania



50






51







52








53






54



T R Sosnowski



55







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57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56





Magurele Romania



50






51







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53






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T R Sosnowski



55







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57







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59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






51







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53






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T R Sosnowski



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57







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59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







52








53






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








53






54



T R Sosnowski



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57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56






54



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



T R Sosnowski



55







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56








57







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56







58












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56












59





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56





60









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56









Vandewalle N 38 50

61



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



ZZgură I 53 55

62



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56



























63


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56


























64


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56


















65






A

Aksenenko E V 16

B

Bădulescu M 45

C

Caserta S 17

Cacircrstocea B 53

D

Danov K D 57

E

Eddi A 23

F

Ferrari M 19 47 48 49 56

ORAL PRESENTATIONSp21mcm.inflpr.ro/BOOKLET_ABSTRACTS.doc · Web view4-6 MAY, 2009 Romanian...

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Transcript of ORAL PRESENTATIONSp21mcm.inflpr.ro/BOOKLET_ABSTRACTS.doc · Web view4-6 MAY, 2009 Romanian...