Editorial Nanofiber Manufacture, Properties, and...
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Editorial Nanofiber Manufacture, Properties, and Applications 2013 Tong Lin, 1 Gajanan S. Bhat, 2 and Raghavendra Hegde 3 1 Australian Future Fibres Research and Innovation Centre, Institute for Frontier Materials, Deakin University, 75 Pigdons Road, Waurn Ponds, VIC 3216, Australia 2 Nonwovens Research Laboratory, e University of Tennessee, 1321 White Avenue, Knoxville, TN 37996, USA 3 Domtar Personal Care, 2332 US Highway 42 South, Delaware, OH 43015, USA Correspondence should be addressed to Tong Lin; [email protected] Received 12 January 2014; Accepted 12 January 2014; Published 18 February 2014 Copyright © 2014 Tong Lin et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Nanofibers possess versatile properties and wide applications. Although they can be prepared by several different methods, electrospinning is distinct from other nanofiber-making techniques in versatility to process different polymers, ability to control fiber diameter, morphology, orientation, com- ponent and fibrous structure, and potential for large-scale production. e ease of electrospinning nanofibers on small scales, mainly using a needle-based electrospinning setup, in laboratories has considerably facilitated researchers’ finding of the unique properties and applications of electrospun nanofibers. is special issue highlights the functional applications of electrospun nanofibers in gas sensor, drug delivery, and electronics fields. A planar-type methane sensor was prepared from a doped electrospun SnO 2 nanofiber. e sensor was reported to have good stability, prominent repro- ducibility, and excellent selectivity. In comparison with SnO 2 nanospheres, which were used conventionally for making methane sensors, the nanofibers had higher gas response and saturated detection concentration, as well as quicker response-recovery time. Controlling drug release has many applications in the biomedical field. In one of the papers on drug delivery nanofibers, drug was loaded in polymer/silica hybrid nanofibers. e presence of the silica remarkably enhanced drug loading efficiency, nanofiber hydrophilicity, and mechanical properties. Assessed by in vitro cell tests, the hybrid nanofibers showed good biocompatibility for guided bone regeneration. Another paper reports drug loaded nanofibers which were electrospun directly onto a polymeric backing film. e optimized nanofiber/film matrix system showed enhancement in drug dissolution rate, useful for rapid mucosal drug delivery. Two papers on electronics applications of electrospun nanofibers were included in this special issue. One paper reports on the p-n junction and rectifying property of a layered fibrous mat consisting of inorganic nanofibers and conducting polymer nanofibers. e fibrous mat had an obvious diode-rectifying characteristic, and the thickness of the nanofiber layers considerably influenced the device resistance and rectifying performance. Such nanofibrous diode rectifier may find applications in sensors, energy harvest, and electronic textiles. Another paper is on electrode connection solder. Short circuit oſten occurs at fine pitch interconnections of electronic devices. To solve this problem, solder balls were incorporated into polyvinylidenefluoride nanofibers through electrospinning. e nanofiber solder showed considerable improvement in solder capture rate and 100% insulation between electrodes. It also improved contact conductivity, current handling ability, and reliability. e special issue also collects fundamental research on electrospinning. Electric current between electrospinning electrodes originates from the movement of charge carriers through the spinning space. It was reported that the majority of charge carriers were formed by ionization of the air close to the metallic needle nozzle or the polymer jet. e addition of salt to polymer solution increased the carrier concentration. However, the conductivity of polymer jets did not significantly affect the current since the jets did not link the electrodes. Hindawi Publishing Corporation Journal of Nanomaterials Volume 2014, Article ID 543678, 2 pages http://dx.doi.org/10.1155/2014/543678
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Transcript of Editorial Nanofiber Manufacture, Properties, and...
EditorialNanofiber Manufacture, Properties, and Applications 2013
Tong Lin,1 Gajanan S. Bhat,2 and Raghavendra Hegde3
1 Australian Future Fibres Research and Innovation Centre, Institute for Frontier Materials, Deakin University, 75 Pigdons Road,Waurn Ponds, VIC 3216, Australia
2 Nonwovens Research Laboratory, The University of Tennessee, 1321 White Avenue, Knoxville, TN 37996, USA3Domtar Personal Care, 2332 US Highway 42 South, Delaware, OH 43015, USA
Correspondence should be addressed to Tong Lin; [email protected]
Received 12 January 2014; Accepted 12 January 2014; Published 18 February 2014
Copyright © 2014 Tong Lin et al.This is an open access article distributed under the Creative Commons Attribution License, whichpermits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Nanofibers possess versatile properties andwide applications.Although they can be prepared by several different methods,electrospinning is distinct from other nanofiber-makingtechniques in versatility to process different polymers, abilityto control fiber diameter, morphology, orientation, com-ponent and fibrous structure, and potential for large-scaleproduction. The ease of electrospinning nanofibers on smallscales, mainly using a needle-based electrospinning setup, inlaboratories has considerably facilitated researchers’ findingof the unique properties and applications of electrospunnanofibers.
This special issue highlights the functional applicationsof electrospun nanofibers in gas sensor, drug delivery,and electronics fields. A planar-type methane sensor wasprepared from a doped electrospun SnO
2nanofiber. The
sensor was reported to have good stability, prominent repro-ducibility, and excellent selectivity. In comparison with SnO
2
nanospheres, which were used conventionally for makingmethane sensors, the nanofibers had higher gas responseand saturated detection concentration, as well as quickerresponse-recovery time.
Controlling drug release has many applications inthe biomedical field. In one of the papers on drugdelivery nanofibers, drug was loaded in polymer/silicahybrid nanofibers. The presence of the silica remarkablyenhanced drug loading efficiency, nanofiber hydrophilicity,and mechanical properties. Assessed by in vitro cell tests, thehybrid nanofibers showed good biocompatibility for guidedbone regeneration. Another paper reports drug loadednanofibers which were electrospun directly onto a polymeric
backing film. The optimized nanofiber/film matrix systemshowed enhancement in drug dissolution rate, useful forrapid mucosal drug delivery.
Two papers on electronics applications of electrospunnanofibers were included in this special issue. One paperreports on the p-n junction and rectifying property of alayered fibrous mat consisting of inorganic nanofibers andconducting polymer nanofibers. The fibrous mat had anobvious diode-rectifying characteristic, and the thicknessof the nanofiber layers considerably influenced the deviceresistance and rectifying performance. Such nanofibrousdiode rectifier may find applications in sensors, energyharvest, and electronic textiles. Another paper is on electrodeconnection solder. Short circuit often occurs at fine pitchinterconnections of electronic devices. To solve this problem,solder balls were incorporated into polyvinylidenefluoridenanofibers through electrospinning. The nanofiber soldershowed considerable improvement in solder capture rate and100% insulation between electrodes. It also improved contactconductivity, current handling ability, and reliability.
The special issue also collects fundamental research onelectrospinning. Electric current between electrospinningelectrodes originates from the movement of charge carriersthrough the spinning space. It was reported that the majorityof charge carriers were formed by ionization of the airclose to the metallic needle nozzle or the polymer jet. Theaddition of salt to polymer solution increased the carrierconcentration. However, the conductivity of polymer jets didnot significantly affect the current since the jets did not linkthe electrodes.
Hindawi Publishing CorporationJournal of NanomaterialsVolume 2014, Article ID 543678, 2 pageshttp://dx.doi.org/10.1155/2014/543678
2 Journal of Nanomaterials
Apart from electrospun nanofibers, a paper on multi-walled carbon nanotube (MWCNT)/polyamide 66 compos-ites is also included in this special issue. MWCNTs withsurfacesmodified separatelywith acid and amine groupswereused as fillers. The amine-modified MWCNTs showed betterdispersion in the polymer matrix than pristine- and acid-modifiedMWCNTs.They induced heterogeneous nucleationof PA66 and significantly improved the composite hardnessand elastic modulus.
As guest editors of this special issue, we are pleased to seethis progress. We hope that this special issue will contributeto the wide use of nanofibers and that the papers collected inthis special issue are well received by the reader.
Acknowledgments
The editors gratefully thank the authors for their contri-butions to this special issue and the reviewers for theirconstructive comments and dedication.
Tong LinGajanan S. Bhat
Raghavendra Hegde
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