Abstract
Abstract Orientations of liquid crystals on modified surfaces with different chemical groups were investigated using Langmuir-Blodgett (LB) films, in order to clarify the alignment mechanism in liquid crystal cells. The surfaces, covered with carboxyl, hydroxyl, amine, cyano and alkyl groups, were prepared by combination of a conventional LB method and a horizontal lifting method. It has been found that the molecular alignment in liquid crystal cells depend on the dipole interaction term in the surface energy of the substrate film. LB films with polar groups, such as carboxyl and hydroxyl, at the outermost surface, used for the substrate, produced good liquid crystal cell properties, involving small pre-tilt angles, clear in-plane anisotropy of transmittance and sharp voltage response, as compared with polyimide films.
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