Abstract
Abstract A memory effect of molecular orientation observed in a nematic liquid crystal cell without rubbing is investigated by using a pairing of plane and parallel electrode structures. The liquid crystal cell gives an opaque state by heating it up to an isotropic phase and cooling down to a nematic phase with an external field applied; strong light scattering properties can be obtained. The opaque state is stable for a long period of time at room temperature. However, once the liquid crystal cell is heated up to an isotropic phase and cooled down in the absence of an external field, the opaque state can be cleared and the cell returns to its transparent initial state. The light scattering properties and microscopic textures of the liquid crystal cell are investigated for various experimental conditions.
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