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![Page 1: Soft Matter Group philosophy Define projects, complimentarity, mobility and international collaborations, visitors, group meetings, funding Infrastructure.](https://reader031.fdocuments.in/reader031/viewer/2022032702/56649ccc5503460f94995676/html5/thumbnails/1.jpg)
Soft Matter
Group philosophyDefine projects, complimentarity, mobility and international collaborations,visitors, group meetings, fundingInfrastructure with expertise (basis for further development)
Members (senior)G. FytasG. Petekidis D. Vlassopoulos
FORTH people:A. Larsen, technicianU. Jonas, Researcher AB. Loppinet, Researcher B
Current funding: EU (ITN, NoE, LSI), limited industrial
Collaborations: US, Canada, Japan, Korea, France, UK, Germany, Belgium
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Tailoring the flow of soft matter molecular design: synergy of chemistry, modeling, physical
expt
HardSoft
Com
ple
xit
y -
tu
nab
ility
ThermodynamicsDynamic arrest
Structure / dynamicsRheology
D. Vlassopoulos UoC-MST & FORTH-IESL
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Viscoelasticity of entangled polymers
polymers with free ends
State-of-the-art: from Edwards over deGennes to Doi and McLeish
Tube modelPlateau modulus G=ρRT/Me
Linear: reptation etcStar: arm retraction
![Page 4: Soft Matter Group philosophy Define projects, complimentarity, mobility and international collaborations, visitors, group meetings, funding Infrastructure.](https://reader031.fdocuments.in/reader031/viewer/2022032702/56649ccc5503460f94995676/html5/thumbnails/4.jpg)
Viscoelasticity of entangled polymers
polymers with free ends
State-of-the-art: from Edwards over deGennes to Doi and McLeish
Q: polymers without free ends ?
Tube modelPlateau modulus G=ρRT/Me
Linear: reptation etcStar: arm retraction
Ring polymers
Roovers, NRC, 1985
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Pure linear melt and melt of ring PS (no plateau)
τe
0.43
Power-law stress relaxation of entangled rings
Kapnistos et al, Nat. Mat. 2008
M. Rubinstein, UNC, 2003
Key: Critical fractionation toobtain pure rings(T. Chang, Pohang Univ., 2000)
t [s]
0.0001 0.001 0.01 0.1 1 10 100 1000
G(t
) [P
a]
1e+0
1e+1
1e+2
1e+3
1e+4
1e+5
1e+6
1e+7
ring 81kG(t) prediction rubinstein 81kring 38kG(t) prediction rubinstein 38kring 24kG(t) prediction rubinstein 24k
R. Pasquino
Linear ‘contaminant’ chainpenetrates rings maximizingentropy and percolating
New PI rings 24, 38, 81 K: Hadjichristidis et al, Univ. Athens
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van Megen and Underwood, PRE 1994
Colloidal Glasses
Mason, Weitz, PRL, 1995
State-of-the-art: HS from Pusey over Götsche to Cates-Fuchs-Weitz
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van Megen and Underwood, PRE 1994
Colloidal Glasses
Mason, Weitz, PRL, 1995
State-of-the-art: HS from Pusey over Götsche to Cates-Fuchs-Weitz
Q: effects of softness, particle architecture
Star polymers
Roovers, Hadjichristidis, 1993Gauthier, U. Waterloo, 2007
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Binary star mixtures
Single glass Double glass
Asymmetric glass
Attractiveglass
Liquid(Ergodic)
C2
Single glass Double glass
Asymmetric glass
Attractiveglass
Liquid(Ergodic)
C2
Scale with softness S=δf/Na
with Stiakakis, Erwin, Cloitre, JCPM 2011
with Mayer, Stiakakis, Likos, Zaccarelli, Sciortino, Nat. Mat. 2008
10-6 10-4 10-2 100 102
100
101
102
103
[P
a]
[s-1].
1.0
Single star glass flow
Key: interpenetrability
П~R/√f
Rogers et al, PRL 2008
with B.Erwin,
M. CloitreJOR 2010, SM 2010PRE 2011
Cloitre
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G. G. FullerC. F. Brooks et al., Langmuir, 1999, 15, 2450
ISR: Interfacial Stress Rheometer
Interfacial Rheology and Dynamics
State-of-the-art: from Gibbs-Langmuir over Plateau to Fuller-Vermant
Q: tailor film rheology (molecular design), ‘transfer’ 3D problems to 2D
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G. G. FullerC. F. Brooks et al., Langmuir, 1999, 15, 2450
ISR: Interfacial Stress Rheometer
Interfacial Rheology and Dynamics
State-of-the-art: from Gibbs-Langmuir over Plateau to Fuller-Vermant
Q: tailor film rheology (molecular design), ‘transfer’ 3D problems to 2D
25 30 35 40 45 500
4
8
12
16
20
31 32 33 34 35
2
4
(m
N m
-1)
A (Å molecule-1)
F12H12 F11H1-core-H12 F12H20
(m
N m
-1)
A (Å2 molecule-1)
T = 20 °C
transition
0.1 1 10
0.1
1
T = 20 °C
G''
G'
G',
G''
(mN
m-1
)
f (rad s-1)
10 mN m-1
8 mN m-1
6 mN m-1
4 mN m-1
2 mN m-1
F12H12
fluorocarbon diblocks
colloidal particles
L. deViguerie, C. Christopoulou, C. Klein, R. Berger, C. Clark, K. Muellen, N. Vogel, K. Landfester and U. Jonas