Chromonic liquid crystalline phase transition involving a biphasic region of nematic and hexagonal phases |
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| Authors: | T.N. Govindaiah H.R. Sreepad |
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| Affiliation: | 1. Research Centre, Post-Graduate Department of Physics, Government College (Autonomous), University of Mysore, Mandya, Indiatngovi.phy@gmail.com;3. Research Centre, Post-Graduate Department of Physics, Government College (Autonomous), University of Mysore, Mandya, India |
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| Abstract: | We report the results of our studies on the optical and thermal properties of binary mixture of two compounds viz. abietic acid and poly ethylene glycol (PEG). The mixture shows a very interesting co-existent biphasic region of lyotropic nematic (N + I) and intermediate hexagonal (M + I) phases, sequentially when the specimen is cooled from its isotropic phase at different concentrations of abietic acid in PEG. The aggregated molecular size has been confirmed by X-ray studies. The temperature variation of optical anisotropy, electrical conductivity, ultrasonic velocity, and molar and adiabatic compressibility has also been discussed. |
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| Keywords: | binary mixture columnar phase lyotropic chromonic molecular aggregation nematic optical anisotropy ultrasonic velocity |
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