Photoresponsive Behavior of Wormlike Micelles Constructed by Gemini Surfactant 12-3-12·2Br – and Different Cinnamate Derivatives

作者：Tu Yan, Qizhou Chen, Yazhuo Shang, Hongni Teng, Honglai Liu · 发表于：Langmuir · 年份：2019 · DOI：10.1021/acs.langmuir.8b04290 · 被引用次数：24 · 研究领域：Surfactants and Colloidal Systems、Porphyrin and Phthalocyanine Chemistry、Photochemistry and Electron Transfer Studies

The photoresponsive wormlike micelles constructed by Gemini surfactants and cinnamate derivatives play a great role in the field of smart materials. However, how the structure of cinnamate derivatives affects the photoresponsive behavior of micelles is still a hotspot for scientists to research. Here, three kinds of aromatic salts with different ortho-substituted groups including trans - o -methoxy cinnamate ( trans -OMCA), trans - o -hydroxy cinnamate ( trans -OHCA), and trans -cinnamate ( trans -CA) were introduced into Gemini surfactant 12-3-12·2Br – aqueous solutions to construct photoresponsive wormlike micelles through their noncovalent interactions. Their properties were researched using the rheological method, cryo-transmission electron microscopy, and 1 H NMR and two-dimensional nuclear Overhauser effect spectra. The results show that these cinnamate derivatives could well construct wormlike micelles with 12-3-12·2Br – . Furthermore, subtle differences in the ortho substituents’ structure have a significant effect on the photoresponsive behavior of formed wormlike micelles. Specifically, the zero viscosity (η 0 ) of 40 mM 12-3-12·2Br – /24 mM trans -OHCA mixed solution decreases from 26.72 to 2.6 Pa·s with the shortening of the length of wormlike micelles after UV irradiation. Correspondingly, the η 0 for the same ratio of 12-3-12·2Br – / trans -OMCA decreases from 2.42 to 0.06 Pa·s and the wormlike micelles are transited into rodlike micelles and even spherical mice...