Abstract

The electrorheology (ER) effect in liquids and liquid crystals are investigated by ultrasonic wave propagation. The acoustic phase-delay change, which is related to the ultrasonic wave velocity, is related to the viscosity of liquids and liquid crystals. The applied voltage dependence of acoustic phase-delay change in nematic liquid crystal, the ferroelectric liquid crystal and silicone oil are measured. The ER effect in liquid and liquid crystals are discussed in the viewpoint of liquid-crystal director orientation.

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