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Refractive and birefringent properties and order parameter of nematic liquid crystal at the direct and reverse nematic ↔ isotropic liquid phase transition

A. E. MAMUK1, A. NESRULLAJEV1,*

Affiliation

  1. Muğla Sıtkı Koçman University, Faculty of Natural Sciences, Department of Physics, Laboratory of Liquid and Solid Crystals, 48000 Kötekli Muğla, Turkey

Abstract

Temperature dependences of the refractive indices, birefringence and molecular polarizability in large temperature interval and especially in the region of the direct nematic mesophase – isotropic liquid (for the heating process) and the reverse isotropic liquid – nematic mesophase (for the cooling process) phase transitions have been studied. Thermotropic monomorphic liquid crystalline material with enantiotropic nematic mesophase has been used. Temperature behavior of the order parameter has been determined. Peculiarities of the biphasic regions of the direct crystal – nematic mesophase and nematic mesophase – isotropic liquid and reverse isotropic liquid – nematic mesophase and nematic mesophase - crystal phase transitions have been investigated..

Keywords

Liquid crystal, Refractive indices, Optical birefringence, Molecular polarizability, Order parameter, Phase transitions..

Submitted at: Sept. 15, 2015
Accepted at: Nov. 25, 2016

Citation

A. E. MAMUK, A. NESRULLAJEV, Refractive and birefringent properties and order parameter of nematic liquid crystal at the direct and reverse nematic ↔ isotropic liquid phase transition, Journal of Optoelectronics and Advanced Materials Vol. 18, Iss. 11-12, pp. 928-937 (2016)