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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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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

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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