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Multifrequency ultrasonic investigations in the liquid crystal 80CB
Author(s) -
Venkatacharyulu P.,
Gupta A. V. N.,
Murthy V. Krishna,
Rao J. V.
Publication year - 1988
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170230718
Subject(s) - compressibility , isotropy , liquid crystal , intermolecular force , ultrasonic sensor , adiabatic process , thermodynamics , crystal (programming language) , materials science , chemistry , condensed matter physics , physics , optics , molecule , acoustics , organic chemistry , computer science , programming language
Investigations on the temperature variation of the specific volume and ultrasonic velocity (at four different fixed frequencies) in the liquid crystal 4′‐n‐octyloxy‐4‐cyanobiphenyl (80CB) are carried out both in the nematic and isotropic phases. From these studies various physical parameters like adiabatic compressibility (ß ad ), molar sound velocity or Rao number ( R n ), molar compressibility ( B ), Van der Waal's constant ( b ) and the intermolecular free lengths ( L ) as a function of temperature are estimated. The variation of all these parameters with the ultrasonic frequency is also studied. The variation of the order parameter with temperature is also studied at the four frequencies and the results are discussed.