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Ultrasonic and Viscous Behaviour of Polymesomorphic Liquid Crystal

The ultrasonic and viscous behaviour of cholesteryl stearate which exhibits multiple mesophase transitions is studied. The variation of ultrasonic velocity ( V ), adiabatic compressibility (β ad ), molar sound velocity ( R ), viscosity (η) and flow activation energy ( E v ) with temperature have been studied in the isotropic, cholesteric and smectic mesophases. The velocity measurements are carried out with a fixed-path double-crystal interferometer and viscosities are measured by a cone-and-plate viscometer within a narrow range of shear rate. The adiabatic compressibility shows abrupt decrease in the vicinity of the thermodynamic transitions between the smectic, cholesteric and isotropic states. The plot of log η vs (1000/ T ) exhibits changes in slopes at the smectic-cholesteric and cholesteric-isotropic transitions. The activation energy for viscous flow is computed. The ultrasonic velocity data in this liquid crystal is reported for the first time.