Lamellar phase formation in catanionic mixtures of hydrogenated and fluorinated surfactants: a comparative study

文献类型： 外文期刊

第一作者： Shen, Yuwen

作者： Shen, Yuwen;Jiang, Lihua;Lin, Haitao;Yang, Li;Shen, Yuwen;Hao, Jingcheng;Hoffmann, Heinz

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关键词： Lamellar phase;Catanionic surfactant;Fluorinated surfactant

期刊名称：COLLOID AND POLYMER SCIENCE （ 影响因子：1.931； 五年影响因子：1.87 ）

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收录情况： SCI

摘要： The properties and phase behaviors of the catanionic mixtures consisting of tetradecyltrimetylammonium bromide (TTABr) and different anionic surfactants (i.e., sodium docanoate, C_(10)HOONa; sodium laurate, C_(12)HOONa; sodium perfluorodecanoate, C_(10)FOONa) were examined, in particular when the molar mixing ratio in the aqueous solution was exactly 1:1. Although the three inspected systems have identical head groups and counterions, they exhibited very different lamellar (La) phases. When using the hydrogenated surfactants, the CioHOONa-TTABr system formed domain-like L_a/Li two phases and the C_(12)HOONa-TTABr system formed cream-like L_a/Li two phases, respectively. In the case of the perfluorinated surfactant, the C_(10)OONa-TTABr system formed interdigitat-ed and tilted L_a gel. The microstructures of the three L_k phases were characterized by polarized microscope, freeze-fracture transmission electron microscope, small angle X-ray scattering, and X-ray diffiaction. The phase transition of the lamellar gel at different temperature was studied by differential scanning cal-orimetry and rheological measurements. The results elucidated the formation of the L-A phase in catanionic mixtures containing hydrogenated or fluorinated anionic surfactants with molar mixing ratio of 1:1.

分类号： O648`O63

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