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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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Journal



Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2012, 4, 39—46.





Influence of Ionic Impurities on Impedance Spectra of Liquid Crystals



B. A. Belyaev1, N. A. Drokin1, A. N. Maslennikov1,2

Author affiliations
1Kirensky Institute of Physics SB RAS 660036,
Krasnoyarsk, Akademgorodok, 50. Russia. 
E-mail: belyaev@iph.krasn.ru
2Siberian Federal University. 
660041, Krasnoyarsk, Svobodny Prospect, 79. Russia

Abstract
Investigations of the total complex resistance (impedance) of the 8CB liquid crystal doped with cetyl-trimethyl ammonium bromide (CTAB) ionic surfactant in the frequency range f =10-2 – 108 Hz were performed. It was established that the introduction of ions into the surfactant leads to an increase of the real and imaginary components of the impedance at low frequencies. Using the method of substitution of the sample with the equivalent electrical circuit, the approximation of the impedance spectra was done and the electrical characteristics of the material were determined.

Keywords: electric impedance, surfactant, ion conductivity, relaxation, diffusion, adsorption, liquid crystals





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