ULTRASONIC STUDIES IN CHOLESTERYL MYRISTATE-CHOLESTERYL PROPIONATE LIQUID CRYSTALLINE MIXTURES.

A. K. George, A. R K L Padmini

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Abstract

Mixtures of Cholesteryl Myristate (CM) and Cholesteryl Propionate (CP) were studied at four different concentrations. CM exhibits smectic, cholesteric and blue phases, while CP is a cholesteric liquid crystal. Addition of CP to CM disrupts the smectic phase while it enhances the cholesteric and blue phases. Ultrasonic velocity (V) was measured in all the mixtures besides the pure ones using fixed path double crystal interferometer at a frequency of 2 MHz. Specific volume ( nu ) was measured using a special dilatometer designed for the study of liquid crystals. The parameters, viz. , adiabatic compressibility (K//a//d) and molar sound velocity (R) were also estimated. Anomalous behavior was observed in all the parameters, viz. , V, nu , K//a//d and R. The results are interpreted on the basis of McMillan's and Lee's theories. The mean interaction parameter was estimated for different mixtures and found to decrease with increasing concentration of CP in the mixture. It was observed that the cholesteric-smectic A transition becomes second order when the mean interaction parameter equals 0. 78 which is in agreement with McMillan's predictions.

Original languageEnglish
Pages (from-to)217-226
Number of pages10
JournalMolecular Crystals and Liquid Crystals
Volume65
Issue number3-4
Publication statusPublished - 1981

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Propionates
ultrasonics
Ultrasonics
Crystalline materials
Liquids
liquids
liquid crystals
Cholesteric liquid crystals
Liquid Crystals
Ultrasonic velocity
extensometers
Dilatometers
Acoustic wave velocity
acoustic velocity
Compressibility
Density (specific gravity)
Interferometers
Liquid crystals
compressibility
interferometers

ASJC Scopus subject areas

  • Engineering(all)

Cite this

ULTRASONIC STUDIES IN CHOLESTERYL MYRISTATE-CHOLESTERYL PROPIONATE LIQUID CRYSTALLINE MIXTURES. / George, A. K.; Padmini, A. R K L.

In: Molecular Crystals and Liquid Crystals, Vol. 65, No. 3-4, 1981, p. 217-226.

Research output: Contribution to journalArticle

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