New low-melting cholesterogens for electro-optical displays and surface thermography

Abstract
New optically active biphenyl compounds have been synthesised. Low-melting mixtures with biphenyl nematogens give stable, room-temperature cholesteric liquid crystals of positive dielectric anisotropy. These give the cholesteric-nematic electro-optical phase-change effect. Mixtures of the new compounds exhibit thermochromism—selective reflection of light varying with temperature.

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