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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Broadband dielectric study of liquid crystal 4-n-decyl-4 '-cyanobiphenyl (10CB) dispersed with hydrophilic aerosil particles
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Broadband dielectric study of liquid crystal 4-n-decyl-4 '-cyanobiphenyl (10CB) dispersed with hydrophilic aerosil particles

机译：亲水性气溶胶颗粒分散的液晶4-n-癸基-4'-氰基联苯（10CB）的宽带介电研究

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摘要

Real (epsilon') and imaginary (epsilon") parts of the complex dielectric permittivity (epsilon*) of the liquid crystal 4-n-decyl-4'-cyanobiphenyl (10CB) dispersed with hydrophilic aerosils, were studied by means of broadband dielectric spectroscopy. In bulk 10CB, which has a direct transition from isotropic to a smectic-A phase, there exists one relaxation process for the parallel orientation of the director to the probing field and another fast relaxation process in the perpendicular orientation. All molecular relaxation processes in 10CB have an Arrhenius-like temperature dependence. The aerosil particles in the LC-aerosil system attach to each other via hydrogen bonding and form a three-dimensional interconnecting aerosil network, thus dividing the LC phase into small domains. IOCB dispersed with different concentrations of hydrophilic aerosils lead to the emergence of a slow relaxation process that was stronger for higher concentration of aerosils. The slow process in the LC-hydrophilic aerosil system is attributed to the relaxation of the molecules that are homeotropically aligned close to the surfaces of the aerosil particles. The temperature dependence of the relaxation times of this process is quite weak. (c) 2005 Elsevier B.V. All rights reserved.
机译：通过宽带电介质研究了分散有亲水性气溶胶的液晶4-n-癸基-4'-氰基联苯（10CB）的复介电常数（epsilon *）的实部（ε'）和虚部（ε“）。在从各向同性到近晶A相直接转变的10CB本体中，存在一个使指向矢与探测场平行取向的弛豫过程，以及一个垂直取向的快速弛豫过程。 10CB中的AOC具有类似Arrhenius的温度依赖性，LC-aerosil系统中的aerosil颗粒通过氢键相互连接并形成三维互连的aerosil网络，从而将LC相分为较小的区域。亲水性气溶胶的出现导致出现慢速弛豫过程，该过程对于较高浓度的气溶胶更强。硅藻土气溶胶系统归因于垂直排列在气溶胶颗粒表面附近的分子的弛豫。该过程的弛豫时间的温度依赖性非常弱。 （c）2005 Elsevier B.V.保留所有权利。

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