Waldemar Greubel

Electric Field Induced Texture Changes in Certain Nematic/Cholesteric Liquid Crystal Mixtures

Abstract In dielectrically positive mixtures of the nematic N4 with cholesteryl-chloride an unusual texture transition was observed which can be applied in a storage effect. The variation of several characteristic parameters of these mixtures with concentration and temperature was measured.

The Homogeneous Alignment of Liquid Crystal Layers

Abstract The usual way to align a liquid crystal layer homogeneously is rubbing the substrate, wherby micro-grooves are produced. We investigated the orienting influence of micro-grooves of variable density using different substrate materials and different liquid crystals. Some theoretical considerations concerning the aligning effect on liquid crystals of surface deformations are presented.