Twisted grain boundary phase in binary mixture of liquid crystals

Govindaiah, T. N. and Nagappa and Sreepad, H. R. (2013) Twisted grain boundary phase in binary mixture of liquid crystals. Molecular Crystals and Liquid Crystals, 574 (1). pp. 1-8. ISSN 1542-1406

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In the present work, our investigation is to study the optical and thermal properties of the binary mixture of cholesteric and nematic compounds, namely, cholesteryl chloride and 4,4′-hexyloxy azoxy benzene, which exhibits a very interesting liquid crystalline twisted grain boundary (TGB) phase and induced smectic phases like SmA, SmC*, SmE, and SmB phases. The chiral liquid crystalline TGB phases have been observed at different concentrations and at different temperatures. The mixture with concentration from 26% to 37% of shows I-Ch-TGB-SmA-SmC*-SmE-SmB phases sequentially when the specimen cooled from isotropic phase. The existence of TGB phase is confirmed by DSC and optical microscopic studies. The temperature variation of optical anisotropy is also discussed. X-ray studies have been carried out to understand the intermolecular interactions in the mixture. With the help of phase diagram, the phase behavior has also been discussed.

Item Type: Article
Uncontrolled Keywords: Chlorine compounds, Binary mixtures, Smectic phasis, Temperature variation, Optical and thermal properties, Intermolecular interactions, Phase diagrams, Cholesteryl chloride, Grain boundaries, Grain boundary phase, Liquid crystalline, Liquid crystals, Phase transitions, TGB phase
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: Arshiya Kousar
Date Deposited: 16 Sep 2019 06:00
Last Modified: 16 Sep 2019 06:00

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