Erasure of Textures Stored in Nematic-Cholesteric Mixtures
In a previous paper (1) we had already reported results on the erasure by an ac field (1 KHz) of the texture stored in nematic-cholesteric mixtures by application of a dc field. The decay of the scattered light intensity after the dc field removal can be characterized by an erasure time τE defined as the time during which this intensity falls from 90 to 10 per cent of its initial value. This time can easily be determined and the variations of τE with various parameters have been examined for mixtures of negative dielectric anisotropy consisting of a commercial product (LCI), nematic in the range 5–70°C and of cholesteryl nonanoate (CN). The experimental results showed that the time τE decreases when the temperature increases (following a law similar to that of the pure nematic substance)and also when the erasing ac voltage rises, the greater the concentration the faster the decrease. In this paper we have studied in more detail for the same mixtures, the variations of the erasure time τE (for 1 KHz) with the dc voltage producing the storage effect.
KeywordsLiquid Crystal Scattered Light Intensity Storage Effect Liquid Crystal Mixture Alternative Voltage
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- (1).B. Kerllenevich and A. Coche, Mol. liquid Crystals, (in press).Google Scholar