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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng

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Journal



Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2015, 15 (2), 50—54.





Anisotropy of Dielectric Properties of the Nematic Mesophase of Two 4-Nitrobenzylidene-4'-Alkyloxyaniline Homologues



Z. Kh. Kuvatov,
A. N. Trofimov
, T. Z. Kondrashova

Author affiliations
Bashkir State University,
32 Validi Zaki St., Ufa, 450076, Russia
E-mail: smectic@mail.ru

Abstract
The paper presents experimental results of the research of the dielectric constant and dielectric loss tangent of the seventh and eighth 4-nitrobenzylidene-4'-alkyloxyaniline homologues. Both compounds form a nematic mesophase. The dependences of dielectric parameters on temperature, frequency of a measuring electric field and the orienting effect of an external magnetic field are given. The results show that the dielectric anisotropy of nematics εα = ε|| - ε is positive and the value εα of the seventh homologue is significantly greater than the anisotropy of the eighth homologue. In the nematic mesophase the low-frequency dispersion of a parallel component of the dielectric parameters is observed.

Keywords: liquid crystals, nematics, dielectric constant, anisotropy, dispersion





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