Study on optical characterization of TGB and reentrant smectic-A phases in binary mixture of two liquid crystals |
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| Authors: | TN Govindaiah HR Sreepad |
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| Institution: | 1. Post-Graduate Department of Physics, Government College (Autonomous), University of Mysore, Mandya, Indiatngovi.phy@gmail.com;3. Post-Graduate Department of Physics, Government College (Autonomous), University of Mysore, Mandya, India |
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| Abstract: | In this work, our investigation is to study the optical and thermal properties of the binary mixture of cholesteric and nematic compounds, namely, cholesteryl nonanoate and p-methoxybenzylidene-p-ethylaniline, which exhibits a very interesting liquid crystalline twisted grain boundary (TGB) phase and reentrant smectic-A phase. The chiral liquid crystalline TGB phases and reentrant smectic-A phases have been observed at different concentrations and at different temperatures. The existence of TGB and reentrant smectic-A phases is confirmed by differential scanning calorimetry and optical microscopic studies. The variation of optical anisotropy has been discussed. The helical pitch of the cholesteric phase has also been discussed. |
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| Keywords: | reentrant smectic phase phase transition TGB phase pitch |
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