Abstract
Abstract The existence of strong fluctuations of the orientational order in the isotropic phase of nematics determines the nature of electro-optical effects near to Tc the temperature of the phase transition of the isotropic liquid into the liquid crystalline state. Electric birefringence in the isotropic phase of liquid crystals differing in the value and direction of the dipole moment of the molecules was investigated. The relaxation phenomena manifest using a radio frequency sinusoidal electric field in the isotropic phase of nematogens in the vicinity of Tc are discussed. Two ranges of dispersion of the Kerr effect were detected experimentally: a low frequency range (f = 105 to 106 Hz) and a high frequency range (for f> 106 Hz) The first range has been related to supermolecular relaxation processes and characterizes the rotational mobility of the fluctuation ‘swarm’ (i.e., the nucleus of the mesophase) in the isotropic phase. The second range was due to the relaxation of the dipole orientation of the ...
Published Version
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