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STUDY OF STRUCTURAL PATTERNS EXHIBITED BY A BINARY MIXTURE OF SMECTIC AND CHOLESTERYL COMPOUNDS

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Author(s): GOVINDAIAH T.N., SREEPAD H.R. AND NAGAPPA

Journal: International Journal of Machine Intelligence
ISSN 0975-2927

Volume: 3;
Issue: 3;
Start page: 112;
Date: 2011;
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Keywords: Optical textures | Renn and Lubbensky model | Smectic and Cholesteric mixture | TGB phase

ABSTRACT
The binary mixture of Cholesteryl ethyl corbonate (CEC) and Terephthal-bis-p-n-Tetradecylaniline (TB14A) exhibits a twisted grain boundary (TGB) phase and smectic polymorphic phases. The mixture exhibits TGB-A and TGB-C phases in different concentrations and at different temperatures. Mixtures with higher concentrations of TB14A exhibit I – Ch - TGB-A - TGB-C - Sm A - Sm I - Sm F phases sequentially when the specimen is cooled from its isotropic melt. The existence of different TGB phases and polymorphic smectic phases are confirmed by DSC and optical microscopic studies.
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