Abstract
The variations in the orientation of the long axis of molecules in nematic liquid crystals induced by an ultrasonic wave have been studied using optical methods. The theoretical and numerical analysis which preceded the experimental examinations was based on the Nagai, Peters and Candau hypothesis assuming the acoustic flow force to be the factor responsible for variations in molecular orientation. The analysis allowed us to determine adequate experimental conditions for the liquid crystal samples situated in the cell of a given geometry with respect to the direction of initial orientation induced by a magnetic field, the direction of an ultrasonic wave and that of a polarized light beam. Our numerical results have been verified experimentally in the range of linear dependence of molecular orientation variations on the intensity of the ultrasonics.
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