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Ultrasonic relaxation studies in the liquid crystal 80CB
Author(s) -
Venkatacharyulu P.,
Gupta A. V. N.,
Prasad N. V. L. N.,
Rao J. V.
Publication year - 1989
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.2170241015
Subject(s) - liquid crystal , isotropy , relaxation (psychology) , ultrasonic sensor , adiabatic process , phase transition , condensed matter physics , phase (matter) , materials science , nuclear magnetic resonance , thermodynamics , chemistry , optics , physics , acoustics , organic chemistry , psychology , social psychology
The variation of the ultrasonic velocity with temperature in the liquid crystal 4′‐n‐octyloxy‐4‐cyanobiphenyl (80CB) at four different fixed ultrasonic frequencies is studied. From these studies various relaxation parameters like the adiabatic relaxation time, velocity at zero frequency, in the vicinity of isotropic‐nematic phase transition and velocity at infinite frequency are estimated. From these parameters the relaxation mechanism in the vicinity of isotropic‐nematic phase transition is studied and the results are discussed.