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Phase Transition Studies of the Liquid Crystal Pentyloxybenzylidene Phenylazoaniline
Author(s) -
Rao K. R. K.,
Rao J. V.,
Venkatacharyulu P.,
Baliah V.
Publication year - 1986
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.2170210616
Subject(s) - liquid crystal , compressibility , phase transition , isotropy , adiabatic process , ultrasonic sensor , materials science , condensed matter physics , phase (matter) , thermodynamics , chemistry , optics , physics , organic chemistry , acoustics
Phase transition studies of the liquid crystal pentyloxybenzylidene phenylazoaniline are investigated with density and ultrasonic velocity measurements. The density variation with temperature confirms that the isotropic liquid‐nematic, nematic‐smectic A and smectic A‐smectic B transitions are of first order. The temperature variation of ultrasonic velocity confirms all the phase transitions. The adiabatic compressibility (β ad ), Rao number ( R n ) and Molar compressibility ( B ) are estimated from density and ultrasonic velocity.