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

Takahiro Yamamoto*, Hiroshi Yokoyama, Yuka Tabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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/[967]-219/[975]
JournalMolecular Crystals and Liquid Crystals
Issue number1
Publication statusPublished - 2007 Jan


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

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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