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首页> 外文期刊>Journal of Molecular Liquids >Strong modulation of electric permittivity at an isotropic-nematic phase transition in a liquid crystal mixture for optical devices based on the Kerr effect
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Strong modulation of electric permittivity at an isotropic-nematic phase transition in a liquid crystal mixture for optical devices based on the Kerr effect

机译：基于克尔效应的光学器件液晶混合物中各向同性-向列相变时介电常数的强调制

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摘要

We report dielectric and electro-optical characteristics of a new bicomponent mixture, which at room temperature exhibits an isotropic phase. The mixture is based on the commonly known 4-Cyano-4'-pentylbiphenyl (5CB) compound and its structural homologue with a fluorine atom substituted laterally at a rigid molecular core. Due to a potential application of the studied mixture for optical devices based bathe Kerr effect, the extensive study of the dielectric and optical properties of investigated mixture was done in a vicinity of an isotropic to a nematic phase transition. The investigated mixture is characterized by a large dielectric pretransitional effect. Under an electric field in the isotropic phase, a paranematic phase with a strong DC-modulation of electric permittivity was observed. Moreover, an unexpected increase of electric permittivity was observed exactly at clearing temperature. This behaviour was confirmed by an electro-optical observation. Relaxation processes at the phase transition are discussed and their parameters for pure compounds and the bicomponent mixture were calculated and analyzed. All experimental results are compared with observations obtained for the pure 5CB compound as a reference. (C) 2016 Elsevier B.V. All rights reserved.
机译：我们报告了一种新的双组分混合物的介电和电光特性，该混合物在室温下表现出各向同性相。该混合物基于众所周知的4-氰基-4'-戊基联苯（5CB）化合物及其结构同系物，在刚性分子核心上侧向取代有氟原子。由于研究的混合物在基于巴斯克尔效应的光学器件中的潜在应用，因此在各向同性至向列相变附近对被研究的混合物的介电和光学性质进行了广泛的研究。所研究的混合物的特征在于大的介电预过渡效应。在各向同性相的电场下，观察到具有强介电常数的直流调制的旁向相。此外，在清洁温度下，确切地观察到介电常数的意外增加。通过电光观察证实了这一行为。讨论了相变过程中的弛豫过程，并计算和分析了其纯化合物和双组分混合物的参数。将所有实验结果与纯5CB化合物作为参考所获得的观察结果进行比较。 （C）2016 Elsevier B.V.保留所有权利。

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