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Maximum Eigen Value Analysis Study to Detect Phase Transitions of Ferroelectric Liquid Crystals

Abstract

Phase transition temperatures of ferroelectric liquid crystals: ((S)-(-)-2-methylbutyl 4’-(4”–nalkanoyloxybenzoyloxy) biphenyl-4-carboxylates (where n = 16 and 18) are identified using of maximum eigen value analysis. The textures of the samples are recorded with the Optical Polarizing Microscope (POM) which has the attachments of hot stage and high resolution camera connected directly to computer system. Eigen values of the recorded textures are computed using MATLAB software. The phase transition temperatures of samples are inferred by the abrupt changes in the computed maximum eigen values. The results of study are in good agreement with those published in earlier literature being made with technique Differential Scanning Calorimetry. The smooth transitions smectic A to Smectic C* which are not resolved in the DSC studies are identified using maximum Eigen value analysis.

S. Sreehari Sastry, K. Lakshmi Sarada, K. Mallika, L. Tanuj Kumar and Ha Sie Tiong

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