Photoinduced Reversible Change of Fluid Viscosity

Hideki Sakai,*†‡ Yoichi Orihara,† Hideki Kodashima,† Atsutoshi Matsumura,† Takahiro Ohkubo,‡ Koji Tsuchiya,‡ and Masahiko Abe†‡
Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan, and Institute of Colloid and Interface Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
J. Am. Chem. Soc., 2005, 127 (39), pp 13454–13455
DOI: 10.1021/ja053323+
Publication Date (Web): September 13, 2005
Copyright © 2005 American Chemical Society
*

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

,
†

 Faculty of Science and Technology.

,
‡

 Institute of Colloid and Interface Science.

, hisakai@rs.noda.tus.ac.jp

Abstract

Abstract Image

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.

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History

  • Published In Issue October 05, 2005
  • Received May 21, 2005

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