Variation of Ultrasonc and Thermo Acoustic Parameters of CYNO Byphenyl Liquid Crystal(8OCB) With Temperature

This research paper communicates the investigations of  variation of Ultrasonic and thermoacoustic parameters with temperature of   a technically important Liquid crystal 8OCB (4′-octyloxy-4-cyanobiphenyl). Parameters like adiabatic compressibility, Molar sound velocity, Molar compressibility and intermolecular free length and also certain thermoacoustic parameters like., isochoric temperature coefficient of internal pressure (χ), isochoric temperature coefficient of volume expansivity (χ′), pressure co-efficient of bulk modulus (c₁), reduced compressibility (β̄), reduced volume (v̄) and Sharma constant (S₀) are also evaluated. The anomalous behaviour observed in ultrasonic and thermoacoustic parameters provide supporting evidence to the smectic A- nematic transitions at 66°C and nematic- isotropic transition at 78°C of the liquid crystal under study.

Liquid Crystals, Thermoacoustic Parameters, Ultrasonic Velocity, Phase Transition, 8OCB

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