Abstract
An optical and a dielectric memory effect is observed in compensated mixtures of cholesteryl chloride and cholesteryl laurate. When the temperature is increased after a sufficiently high dc electric field is once applied and then reduced to zero at low temperatures, the liquid crystal becomes transparent and the dielectric constant becomes maximum at a temperature approaching the cholesteric to nematic phase transition temperature. This effect can be erased by heating up to an isotropic state. The phase transition from the homeotropic to the plane texture is observed by applying the high frequency electric field. The critical frequency depends upon the sample temperature and it varies from 3 kHz to 500 kHz as the temperature rises from 17°C to 50°C. These phenomena are discussed based on the orientation effects of liquid crystal molecules.
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