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Abstract
It has been known empirically that some kinds of liquid crystal align perpendicular to inorganic flat surface such as In2O3 film. The authors clarified in the previous paper that this phenomena was due to perpendicular adsorption of amphiphilic impurities contained in the liquid crystal to the substrate surfaces. In this paper, the authors evaluate the adsorbabilities of various amphiphilic materials to inorganic surfaces by using a chromatographic effect and investigate the correlation between the adsorbability and the liquid crystal orientation. From the results, it is found that the perpendicular alignment of liquid crystal is induced when polarities of the amphiphilic material and substrate surface are both strong. It is also found that there is evident relation between the polarity and IEPS (Isoelectric Point of Solid Surface) which is a measure of basicity of the surface. This fact suggests that adsorption of the amphiphilic impurity to the surface is due to the acid-base interaction.