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Seo, Youngwook P.,Choi, Hyoung Jin,Seo, Yongsok The Royal Society of Chemistry 2012 SOFT MATTER Vol.8 No.17
<P>A new rheological model was applied to the analysis of the electrorheological behavior of a fluid containing silica nanoparticle-decorated polyaniline nanofibers. The model's predictions were compared with the experimental data, revealing that the proposed model correctly predicted the shear stress behavior both quantitatively and qualitatively. The shear stress data of the electrorheological fluid showing aligned fibers' structural reformation as a function of the shear rate agreed well with the new model which required fewer parameters than the CCJ (Cho–Choi–Jhon) model. The static yield stress was found to be quadratically dependent on the field strength, in agreement with the predictions of the polarization model. A scaling function was used to model the yield stress behavior of the electrorheological fluid over a range of electric fields, and it correctly predicted the static yield stress behavior both quantitatively and qualitatively.</P> <P>Graphic Abstract</P><P>A new rheological model was applied to the analysis of the electrorheological behavior of a fluid containing silica nanoparticle-decorated polyaniline nanofibers. The model's predictions were compared with the experimental data, revealing that the proposed model correctly predicted the shear stress behavior both quantitatively and qualitatively. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2sm07275k'> </P>
Properties and Applications of Carbon Nanotube/PVDF Composites
Yongsok Seo(서용석) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Poly(vinylidene fluoride) (PVDF), a polymorphic material, has useful electro active properties. The piezoelectric crystallization polymorph is the β-phase which has an all-trans (TTTT) conformation. We investigated elongational deformation effect on the conversion of the α-phase crystals into the β-phase crystals and on the piezoelectric properties of PVDF/CNT nanocomposite. A kinetic equation for the nonisothermal crystallization was employed to analyze the crystallization behaviors PVDF/MWCNT composites and its polymorph development. The Avramic exponent, n, could be reasonably well determined from the nonisothermal crystallization exotherm. We applied PVDF/CNT nanocomposite to the fabrication of cell growth scaffolds. The cell growth behavior of the three types of cells was congruent with the amount of the polar β-phase. In vitro tests revealed synergy effects of scaffold's stiffness and ferroelectricity on the cellular activity.