Light-induced transformation of defect structures in photochromic liquid-crystal emulsions

Takahiro Yamamoto, Hiroshi Yokoyama, Yuka Tabe

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    We investigated photoresponsive behavior of azobenzene-containing liquid crystals dispersed with glycerol or water droplets. At an initial state, Saturn ring and hedgehog defects were formed around the glycerol and water droplets, respectively, indicating that homeotropic anchoring was induced by adsorption of the azobenzene molecules onto the droplets. For the glycerol droplets, we observed structural transformation between Saturn ring and boojums on irradiation with ultra-violet and visible light. For the water droplets, an inter-droplet distance varied by changes of the defect size on the irradiation. These phenomena would result from modulation of anchoring conditions by the photoisomerization of the adsorbed dyes.

    Original languageEnglish
    Pages (from-to)211-219
    Number of pages9
    JournalMolecular Crystals and Liquid Crystals
    Volume478
    Issue number1
    DOIs
    Publication statusPublished - 2007 Jan

    Fingerprint

    Liquid Crystals
    Defect structures
    glycerols
    Emulsions
    Liquid crystals
    Saturn rings
    emulsions
    liquid crystals
    defects
    Glycerol
    water
    irradiation
    Azobenzene
    Water
    dyes
    Irradiation
    modulation
    Photoisomerization
    Defects
    adsorption

    Keywords

    • Azobenzene
    • Boojums
    • Hedgehog
    • Liquid-crystal colloid
    • Saturn ring

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Light-induced transformation of defect structures in photochromic liquid-crystal emulsions. / Yamamoto, Takahiro; Yokoyama, Hiroshi; Tabe, Yuka.

    In: Molecular Crystals and Liquid Crystals, Vol. 478, No. 1, 01.2007, p. 211-219.

    Research output: Contribution to journalArticle

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