Sakai Hideki, Orihara Yoichi, Kodashima Hideki, Matsumura Atsutoshi, Ohkubo Takahiro, Tsuchiya Koji, Abe Masahiko
Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
J Am Chem Soc. 2005 Oct 5;127(39):13454-5. doi: 10.1021/ja053323+.
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.
我们报道了一种可逆的光致流体粘度变化。向含有水杨酸钠（NaSal）的十六烷基三甲基溴化铵（CTAB）蠕虫状胶束溶液中加入少量“光开关”偶氮苯修饰的阳离子表面活性剂（4-丁基偶氮苯-4'-（氧乙基）三甲基溴化铵，AZTMA）。由于蠕虫状胶束的缠结网络，反式AZTMA溶液具有非常高的粘度。对反式AZTMA溶液进行紫外光照射会显著降低溶液的粘度，因为顺式AZTMA的庞大结构可能会破坏蠕虫状胶束的网络结构。这种光致粘度变化在反式和顺式AZTMA溶液之间是完全可逆的。
