Photoinduced formation of threadlike micelles from mixtures of a cationic surfactant and a stilbene amphiphile

Yutaka Takahashi, Mai Kishimoto, Yukishige Kondo

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


This study examined the influence of ultraviolet (UV) irradiation on aqueous surfactant solutions containing an anionic stilbene derivative (sodium [4-[(E)-2-(4-butylphenyl)ethenyl]phenoxy]acetate; C4StilNa) as a photoresponsive skeleton. Prior to UV irradiation, an aqueous solution of cetyltrimethylammonium bromide (CTAB) and C4StilNa was a low-viscosity fluid forming spheroidal micelles. Exposure of the low-viscosity fluid to UV light resulted in the formation of threadlike micelles and an increase in the viscosity of the aqueous CTAB/C4StilNa solution. 1H nuclear magnetic resonance spectroscopy indicated that the photochemically induced isomerization and dimerization reactions of C4StilNa molecules had occurred in the aggregates due to UV irradiation. Overall, the structural transformation of the stilbene groups in the C4StilNa molecules with the photochemical reactions leads to an increase in the critical packing parameter and consequently a photoinduced transition of spheroidal micelles to threadlike micelles.

Original languageEnglish
Pages (from-to)250-256
Number of pages7
JournalJournal of Colloid And Interface Science
Publication statusPublished - 2016 May 15
Externally publishedYes


  • Cationic surfactant
  • Photochemical reaction
  • Self-assembly
  • Stilbene
  • Threadlike micelle
  • UV light irradiation
  • Viscosity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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