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ISRN Condensed Matter Physics
Volume 2012 (2012), Article ID 423650, 8 pages
http://dx.doi.org/10.5402/2012/423650
Research Article

Image Analysis Studies for Phase Transitions of Ferroelectric Liquid Crystals

1Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur 522510, India
2Department of Geology, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur 522510, India
3Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Malaysia

Received 5 September 2012; Accepted 24 September 2012

Academic Editors: C. Homes, R. Rossmanith, and S. Wang

Copyright © 2012 S. Sreehari Sastry et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Phase transition temperatures of ferroelectric liquid crystals ((S)-(-)-2-methylbutyl 4′-(4-n-alkanoyloxybenzoyloxy) biphenyl-4-carboxylates (where and 18)) are studied through two techniques of image analysis. One is a statistical method, applied to compute the statistical parameters from the textures of each sample and the other, computation of Legendre moments being applied as image moment analysis, both of which are considered as a function of temperature. The textures of the samples are recorded with the polarizing optical microscope (POM) attached to the hot stage and high resolution camera. The phase transition temperatures of samples are inferred by the abrupt changes in the computed parameter values. The results obtained from the present methodology are in good agreement with those published in earlier literature done by the different techniques, like differential scanning calorimetry (DSC).