Abstract
The reflection spectrum of a mixed nematic-cholesteric liquid crystal has been obtained as a function of mechanical shear. Data are explained in terms of a layered structure consisting of tilted and untilted helical Grandjean texture and a dynamic focal-conic texture for shear rates less than 103 sec−1. The correlated helical structure is shown to tilt under applied shear with slight distortion. At shear rates greater than 103 sec−1, homeotropic texture is generated. The results of this study are consistent with a theoretical model prepared earlier and suggest that the molecular forces maintaining the integrity of the helical structure in cholesteric systems in the Grandjean texture are significantly weakened by incorporation of nematic liquid crystalline materials.
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