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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), 55—62.

Orientational Order in Surface Layers of Mesogens at the Isotropic Phase – Nematic Liquid Crystal Transition

E. N. Vasilchikova, N. N. Barabanova, M. I. Kozeeva, D. L. Bogdanov, V. V. Belyaev, A. K. Dadivanyan

Author affiliations
Moscow State Regional University,
10а Radio St., Moscow, 105005, Russia

The oriented layer of mesogens on the interphase at the isotropic phase – nematic liquid crystal transition has been studied by the polarization microscopy method. The thickness of the oriented layer was found being equal to 50÷1000 mcm and it decreases with the decrease of the surface curvature radius. Analytical expressions for the phase difference arising at passing of plane-polarized light through the mesogen layer oriented towards cylindrical and spherical surfaces were derived. The order parameter in mesogens at the isotropic phase – nematic liquid crystal transition was determined.

Keywords: liquid crystal, polarization microscopy, oriented layer, birefringence, order parameter

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