Reversible alignment change of nematic liquid crystals induced by photochromic molecular films. V. Some attempts to regulate alignment of nematic liquid crystals by various photochromic monolayers.

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  • フォトクロミック分子膜による液晶配向制御に関する研究　第５報　種々のフォトクロミック化合物による石英基板表面修飾と液晶配向制御の試み
  • シュジュ ノ フォトクロミック カゴウブツ ニ ヨル セキエイ キバン ヒョウ

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Surfaces of quartz plates were modified with photochromic compounds including azobenzene, stilbene, cinnamaldehyde, retinal, hemithioindigo, and spiropyran. Photochromic behavior was confirmed for these monolayered compounds except hemithioindigo which underwent irreversible photochemical reaction. The photo-induced alignment change between homeotropic and parallel modes of a nematic liquid crystal (LC) was obsersed only for LC cells which were made of quartz plates modified with azobenzene and stilbene. Attempts to regulate the alignment alteration photochemically with use of the spiropyran monolayer by simultaneous surface treatment with silylating reagents of long alkyl chains were failed. These imply that the change in molecular shape of the photochromic unit is closely related to the LC alignment change.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 47 (10), 771-777, 1990

    The Society of Polymer Science, Japan

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