Photoinduced reversible change of fluid viscosity

Hideki Sakai, Yoichi Orihara, Hideki Kodashima, Atsutoshi Matsumura, Takahiro Ohkubo, Koji Tsuchiya, Masahiko Abe

Research output: Contribution to journalArticle

141 Citations (Scopus)


We report a reversible photoinduced fluid viscosity change. A small amount of a "photoswitchable" azobenzene-modified cationic surfactant (4-butylazobenzene-4′-(oxyethyl)trimethylammonium bromide, AZTMA) was added to a wormlike micellar solution of cetyltrimethylammonium bromide (CTAB) containing sodium salicylate (NaSal). The trans-AZTMA solution had a remarkably high viscosity as a result of the entangled network of wormlike micelles. UV light irradiation on the trans-AZTMA solution remarkably decreased the viscosity of the solution because the bulky structure of cis-AZTMA is likely to disrupt the network structure of wormlike micelles. This photoinduced viscosity change is perfectly reversible between the trans- and cis-AZTMA solutions.

Original languageEnglish
Pages (from-to)13454-13455
Number of pages2
JournalJournal of the American Chemical Society
Issue number39
Publication statusPublished - Oct 5 2005
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Sakai, H., Orihara, Y., Kodashima, H., Matsumura, A., Ohkubo, T., Tsuchiya, K., & Abe, M. (2005). Photoinduced reversible change of fluid viscosity. Journal of the American Chemical Society, 127(39), 13454-13455.