Phase Transition Studies in Mixed Polymesomorphic Liquid Crystals with Cholesteric and Smectic A Phase

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Abstract

Cholesteric mesomorphism was induced in a polymesomorphic liquid crystal with nematic and smectic A phases by mixing it with a low pitch cholesteric. A variety of mixtures for a wide range of concentrations were studied. It was observed that the addition of cholesteric liquid crystal disrupts the smectic phase of the parent polymesomorphic liquid crystal. The measured valuses of ultrasound velocity and specific volume and their related parameters were found to exhibit anomalies near each of the phase transitions. The mean interaction parameter \documentclass{article}\pagestyle{empty}\begin{document}$ \bar \alpha $\end{document} was estimated for different mixtures and was found to decrease with increasing concentration of cholesteric liquid crystal in the mixture. It was observed that smectic A‐cholesteric transition becomes second‐order at a particular concentration in agreement with the theoretical predictions.

Original languageEnglish
Pages (from-to)361-365
Number of pages5
JournalCrystal Research and Technology
Volume27
Issue number3
DOIs
Publication statusPublished - 1992

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Liquid Crystals
mixed crystals
Liquid crystals
Cholesteric liquid crystals
Phase transitions
liquid crystals
Density (specific gravity)
Ultrasonics
anomalies
predictions
interactions

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "Cholesteric mesomorphism was induced in a polymesomorphic liquid crystal with nematic and smectic A phases by mixing it with a low pitch cholesteric. A variety of mixtures for a wide range of concentrations were studied. It was observed that the addition of cholesteric liquid crystal disrupts the smectic phase of the parent polymesomorphic liquid crystal. The measured valuses of ultrasound velocity and specific volume and their related parameters were found to exhibit anomalies near each of the phase transitions. The mean interaction parameter \documentclass{article}\pagestyle{empty}\begin{document}$ \bar \alpha $\end{document} was estimated for different mixtures and was found to decrease with increasing concentration of cholesteric liquid crystal in the mixture. It was observed that smectic A‐cholesteric transition becomes second‐order at a particular concentration in agreement with the theoretical predictions.",
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T1 - Phase Transition Studies in Mixed Polymesomorphic Liquid Crystals with Cholesteric and Smectic A Phase

AU - George, A. K.

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N2 - Cholesteric mesomorphism was induced in a polymesomorphic liquid crystal with nematic and smectic A phases by mixing it with a low pitch cholesteric. A variety of mixtures for a wide range of concentrations were studied. It was observed that the addition of cholesteric liquid crystal disrupts the smectic phase of the parent polymesomorphic liquid crystal. The measured valuses of ultrasound velocity and specific volume and their related parameters were found to exhibit anomalies near each of the phase transitions. The mean interaction parameter \documentclass{article}\pagestyle{empty}\begin{document}$ \bar \alpha $\end{document} was estimated for different mixtures and was found to decrease with increasing concentration of cholesteric liquid crystal in the mixture. It was observed that smectic A‐cholesteric transition becomes second‐order at a particular concentration in agreement with the theoretical predictions.

AB - Cholesteric mesomorphism was induced in a polymesomorphic liquid crystal with nematic and smectic A phases by mixing it with a low pitch cholesteric. A variety of mixtures for a wide range of concentrations were studied. It was observed that the addition of cholesteric liquid crystal disrupts the smectic phase of the parent polymesomorphic liquid crystal. The measured valuses of ultrasound velocity and specific volume and their related parameters were found to exhibit anomalies near each of the phase transitions. The mean interaction parameter \documentclass{article}\pagestyle{empty}\begin{document}$ \bar \alpha $\end{document} was estimated for different mixtures and was found to decrease with increasing concentration of cholesteric liquid crystal in the mixture. It was observed that smectic A‐cholesteric transition becomes second‐order at a particular concentration in agreement with the theoretical predictions.

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