Experimental Investigations on Ultrasonic Velocity and Behavior of Thermodynamic Parameters of Four Members of nO.m Series

D. Madhavi Latha; V.G.K.M. Pisipati; M. Ramakrishna Nanachara Rao; P.V. Datta Prasad

doi:10.4028/www.scientific.net/SSP.181-182.43

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HomeSolid State PhenomenaSolid State Phenomena Vols. 181-182Experimental Investigations on Ultrasonic Velocity...

Experimental Investigations on Ultrasonic Velocity and Behavior of Thermodynamic Parameters of Four Members of nO.m Series

Abstract:

Ultrasonic velocity measurements are carried out on four nOm compounds viz., N-(p-n-methoxy and ethoxy benzylidene)-p-n-dodecyl and tetradecyl anilines, 1O.12, 1O.14, 2O.12 and 2O.14. The first three compounds exhibit mono variant nematic phase while the last compound exhibits nematic and smectic-A phases with variable thermal ranges. The temperature dependence of sound velocity, U shows minima at the isotropic-nematic and nematic-smectic-A transitions. In conjunction with the density data of these compounds, the thermo acoustic parameters such as adiabatic compressibility (β_ad), the molar sound velocity (Rao’s number) (R_n), molar compressibility (W), molecular free length (L_f) and available volume (V_a) are estimated. In addition the intermolecular free length (L_f) is estimated in three different ways employing density and ultrasonic velocity data. The results are compared with the data available in literature of other compounds.

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Solid State Phenomena (Volumes 181-182)

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43-46

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.181-182.43

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November 2011

Authors:

D. Madhavi Latha, V.G.K.M. Pisipati, M. Ramakrishna Nanachara Rao, P.V. Datta Prasad

Keywords:

Adiabatic Compressibility, nO.m Compounds, Phase Transition, Sound Velocity

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