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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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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2015, 15 (2), 55—62. |
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Orientational Order in Surface Layers of Mesogens at the Isotropic Phase – Nematic Liquid Crystal Transition
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E. N. Vasilchikova, N. N. Barabanova, M. I. Kozeeva, D. L. Bogdanov, V. V. Belyaev, A. K. Dadivanyan
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Author affiliations
Moscow State Regional University,
10а Radio St., Moscow, 105005, Russia
E-mail: dadivank@mail.ru
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Abstract
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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