Density and Ultrasonic Velocity Measurements in Hexyloxybenzylidene Phenylazoaniline |
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| Authors: | K R K Rao J V Rao P Venkatacharyulu V Baliah |
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| Institution: | 1. Physics Department , Nagarjuna University , Nagarjunanagar, 522 510, India;2. Chemistry Department , Nagarjuna University;3. Physics Department , Nagarjuna University , Nagarjunanagar, 522 510, India |
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| Abstract: | The temperature variation of density and ultrasonic velocity of the liquid crystal hexyloxybenzylidene phenylazoaniline are reported. The density across the smectic A—smectic B transition is more predominant than the other transitions. The density variation with temperature and the calculated thermal expansion coefficients suggest that the transitions isotropic liquid—nematic, nematic—smectic A and smectic A—smectic B are of first order. Anomalous behaviour of ultrasonic velocity is observed across the isotropic liquid—nematic transition and prominent dips in velocity are observed at the nematic—smectic A and smectic A—smectic B transitions. The adiabatic compressibility (β ad ) Rao number (R a ) and molar compressibility (B) are estimated using the experimental density and ultrasonic velocity. |
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| Keywords: | hexyloxybenzylidene phenylazoaniline density ultrasonic velocity thermal expansion coefficient adiabatic compressibility Rao number |
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