Influence of surface anchoring conditions on the dielectric and electro-optical properties of nematic droplets dispersed in a polymer network
作者： Mourad Boussoualem , Mimoun Ismaili , Frederick Roussel
DOI: 10.1039/C3SM52573B
关键词:
摘要: Dielectric and electro-optical properties of liquid crystal (LC) dispersions exhibiting two different surface anchoring conditions at the polymer–LC interface are investigated. The confining was tuned by changing side chains polymeric matrix in order to get either planar or homeotropic and, turn, bipolar radial LC droplets, respectively. In low frequency region dielectric spectra, exhibit a broad absorption domain, which has been assigned depolarization field effect (Maxwell–Wagner–Sillars (MWS) mechanism). strength relaxation MWS process closely related geometry confined phase. case electrical conductivity dominates whereas for droplets capacitive effects predominant. From (EO) measurements numerical simulations electric inside it is shown that enhanced EO performances compared their counterparts. Based on simple topological electrodynamic approaches, this phenomenon spatial distribution charges droplets.
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sci-hub.se 参考文章(42)
Broadband dielectric spectroscopy Springer. ,(2003) , 10.1007/978-3-642-56120-7
Frédérick Roussel, Cécile Canlet, Bing M. Fung, Morphology and orientational order of nematic liquid crystal droplets confined in a polymer matrix. Physical Review E. ,vol. 65, pp. 021701- ,(2002) , 10.1103/PHYSREVE.65.021701
Frédérick Roussel, Bing M. Fung, Anchoring behavior, orientational order, and reorientation dynamics of nematic liquid crystal droplets dispersed in cross-linked polymer networks. Physical Review E. ,vol. 67, pp. 041709- ,(2003) , 10.1103/PHYSREVE.67.041709
Surajit Dhara, N. V. Madhusudana, Enhancement of the orientational order parameter of nematic liquid crystals in thin cells. European Physical Journal E. ,vol. 13, pp. 401- 408 ,(2004) , 10.1140/EPJE/I2003-10084-8
Ivan Haller, Thermodynamic and static properties of liquid crystals Progress in Solid State Chemistry. ,vol. 10, pp. 103- 118 ,(1975) , 10.1016/0079-6786(75)90008-4
A. R. Brás, S. Frunza, L. Guerreiro, I. M. Fonseca, A. Corma, L. Frunza, M. Dionísio, A. Schönhals, Molecular mobility of nematic E7 confined to molecular sieves with a low filling degree Journal of Chemical Physics. ,vol. 132, pp. 224508- 224508 ,(2010) , 10.1063/1.3432775
G. K. Auernhammer, J. Zhao, B. Ullrich, D. Vollmer, Frequency-dependent deformation of liquid crystal droplets in an external electric field European Physical Journal E. ,vol. 30, pp. 387- 394 ,(2009) , 10.1140/EPJE/I2009-10538-Y
I. Vilfan, M. Vilfan, S. Žumer, Orientational order in bipolar nematic microdroplets close to the phase transition. Physical Review A. ,vol. 40, pp. 4724- 4730 ,(1989) , 10.1103/PHYSREVA.40.4724
Vincenzo Vitelli, William Irvine, The geometry and topology of soft materials Soft Matter. ,vol. 9, pp. 8086- 8087 ,(2013) , 10.1039/C3SM90111D
Y. J. Liu, X. W. Sun, Holographic Polymer-Dispersed Liquid Crystals: Materials, Formation, and Applications Advances in Optoelectronics. ,vol. 2008, pp. 1- 52 ,(2008) , 10.1155/2008/684349