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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., 2016, 16 (1), 22—28.
DOI: 10.18083/LCAppl.2016.1.22





Influence of P, V, T – Termodynamic State Parameters upon Dynamics of Orientational Processes of Nematic Liquid Crystals



A. N. Larionov1, N. N. Larionova2, A. I. Efremov2

Author affiliations
1Voronezh State Agrarian University,
1 Michurin St., Voronezh, 394087, Russia
E-mail: larionovan@yandex.ru
2Voronezh State University,
1 University Squire, Voronezh, 394006, Russia

Abstract
The results of the experimental researches of thermodynamic state parameters upon Leslie coefficient α1 and twist viscosity of p-n-butoxybezylidene-p-n-butylaniline are presented. The pulse method of fixed distance at the frequency 3 MHz has been used. The influence of the thermodynamic state parameters upon the coefficient of rotational viscosity in a framework of free volume theory has been implemented. The coefficient of twist viscosity is exponentially depends on the temperature. The absence of the pressure and the temperature influence upon the activation energy was obtained. The energy of the free volume formation has been calculated. The enlargement of the specific volume leads to the diminution of the Leslie coefficient α1. At the inversion temperature of the ultrasound attenuation coefficient anisotropy the sign of Leslie coefficient α1 is changes. The increase of the temperature leads to the exponential decrease of the coefficient α1 in the range of positive values of this coefficient. The activation energy is linearly increased when the pressure is enlarged.

Keywords: twist viscosity, orientation relaxation, Leslie coefficient, ultrasound





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