Anisotropic Ultrasonic Properties of a Nematic Liquid Crystal

Abstract
Ultrasonic measurements (2 to 6 MHz) on a room-temperature nematic liquid crystal have shown the attenuation to vary strongly with the angle θ between the sound-wave propagation direction and the direction of an aligning magnetic field. The velocity change is quite small, amounting to some 0.1% between the θ=90 and the θ=0 case. The orientation-dependent attenuation is of the hysteresis type.

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