Phase Transition from Worm-Like Micelles to Vesicles Triggered by pH Value

文献类型： 外文期刊

第一作者： Zhang, Yufeng

作者： Zhang, Yufeng;Lin, Haitao;Yang, Li;Hao, Jingcheng;Fan, Wenjing;Fan, Dawei

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关键词： Catanionic surfactant;vesicle;worm-like micelle

期刊名称：JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY （ 影响因子：2.262； 五年影响因子：2.064 ）

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收录情况： SCI

摘要： The transition from worm-like micelles to vesicles can take place in certain cationic-anionic (catanionic) systems such as the tetradecyltrimethylammonium laurate (TTAL) aqueous solution that is prepared by adding hydrochloric acid (HCl). It appears that the lamellar phase of 100 mmol . L-1 of TTAL aqueous solution should go through a series of phase transition processes under different pH conditions, in which the content of HCl is gradually increased. When the pH value was modulated to about 7, the lamellar phase became worm-like micelle phase. By further increasing the content of HCl, the worm-like micelle phase tends to separate into two phases. Specifically, the top phase seems to be turbid structure, whereas the lower phase is still worm-like micelle phase. In the worm-like micelle one phase (pH = 7.04), a phase transition from worm-like micelles to vesicles is evident with the increase in temperature. Therefore, such phase transition processes could be readily monitored by turbidity or rheological analyses. Dynamic light scattering and cryo-Transmission Electron Microscopy measurements were also employed to determine the structures before and after phase transition. Consequently, this work would yield new insights to understand the phase transition mechanism of catanionic surfactants induced by pH change.

分类号： O648

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