Ultrasonic and Viscous Behaviour of Polymesomorphic Liquid Crystal

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概要

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• 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.

• 社団法人日本物理学会の論文
• 1971-09-05

著者

• Padmini A.

  Ultrasonics Lab. Physics Department Faculty Of Tech. And Engg. M.s. University Of Baroda

• Padmini A.

  Ultrasonics Laboratory Physics Department Faculty Of Technology And Engineering M.s. University Of B

• Kartha C.

  Ultrasonics Laboratory Physics Department Faculty Of Technology And Engineering M.s. University Of B

• Kartha C.

  Ultrasonics Laboratory Physics Department Faculty Of Technology And Engineering M.s. University Of B

• Kartha C.G.

  Ultrasonics Laboratory, Physics Department, Faculty of Technology and Engineering, M.S. University of Baroda

関連論文

• Viscous Behaviour of Cholesteric Liquid Crystals
• Elastic Properties of Bismuth-Antimony Alloys
• Ultrasonic Absorption in Cholesteric Liquid Crystals
• Ultrasonic and Viscous Behaviour of Polymesomorphic Liquid Crystal

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