Abstract
Temperature dependence of the tilt angle, polarization and capacitance has been studied in three different FLC-mixtures and various cell thicknesses and the Landau expansion coefficients α and b have been determined. It has been found that these parameters are considerably affected by the thickness of the samples and smaller values of apparent Landau expansion coefficients have been obtained in the case of thin samples. This effect has been attributed to the surface forces action.
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