文献类型：期刊文献

英文题名：Rheological Properties of a Novel Photosensitive Micelle Composed of Cationic Gemini Surfactant and 4-Phenylazo Benzoic Acid

作者：Yu, Licheng[1];Fang, Bo[1];Jin, Hao[1];Chen, Jie[1];Li, Kejing[1];Tian, Meng[1];Yang, Mo[1];Jin, Leiping[1]

机构：[1]E China Univ Sci & Technol, Lab Chem Engn Rheol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：36

期号：12

起止页码：1770

外文期刊名：JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20154101346482);WOS:【SCI-EXPANDED(收录号:WOS:000357797900010)】；

基金：This work was supported by the National Natural Science Foundation of China (21273072).

语种：英文

外文关键词：Cationic Gemini surfactant; micellar system; photorheological

摘要：A new and simple reversible photorhelogical (PR) micelle system was investigated, which is composed of the cationic Gemini surfactant propylene-(dimethyldioctadecylammonium chloride) (18-3-18) and the photoresponsive counter ion, trans-4-phenylazo benzoic acid (trans-ACA). Before UV irradiation, the 18-3-18/trans-ACA mixtures with proper compositions formed highly viscoelastic fluids, showing good viscoelasticity, thixotropy, and shear thinning properties. After UV irradiation, the rheological properties of 18-3-18/ACA micelles changed obviously, exhibiting UV photothinning properties, because the trans-ACA was isomerized to cis-ACA. For the 18-3-18/ACA (8 mM/10mM) micelle system, after 1 hour UV irradiation at 365 nm, the reduction percentage of the relative viscosity of the micelle was nearly 90%, and its thixotropy loop disappeared. It was revealed that the rheological properties of micelles changed gradually during the process of UV irradiation. In addition, the rheological properties of UV-irradiated micelles can recover after visible light irradiation. The proposed mechanism was validated by ultraviolet-visible (UV-vis) spectra of 18-3-18/ACA micelles.