The behaviour of polymer dispersed cholesteric droplets in electric fields has been investigated for materials with both negative and positive dielectric anisotropy. Microscopic observations parallel and perpendicular to the electric field were performed. In materials with εa < 0, the cholesteric pitch remains constant but a disclination ring occurs due to reorientation of the local helix directions. In systems with εa > 0, however, helical unwinding was observed.
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Kitzerow et al. (1993) studied this question.
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