Wormlike micelles and microemulsions in aqueous mixtures of sucrose esters and nonionic cosurfactants

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• 作者：Carlos Rodriguez-Abreu ; Kenji Aramaki ; Yusuke Tanaka ; M. Arturo Lopez-Quintela ; Masahiko Ishitobi and Hironobu Kunieda
• 刊名：Journal of Colloid and Interface Science
• 出版年：2005
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：2005
• 卷：291
• 期：2
• 页码：560-569
• 文件大小：358 K

摘要

A study of the phase and rheological behavior of sucrose hexadecanoate (C₁₆SE)/cosurfactant/water systems in the presence of solubilized oil, using complementary techniques such as dynamic light scattering and small angle X-ray scattering, is presented. Viscoelastic wormlike micellar solutions are found when a nonionic lipophilic cosurfactant is added to C₁₆SE aqueous systems. Contrary to previous reports, the effect of oil solubilization on these wormlike micelles is not unique and depends on several factors. Linear alkyl chain oils that tend to solubilize in the micellar core have a disrupting effect, decreasing the relaxation time and the viscosity of the systems. This effect is larger as the molecular volume of oil increases and as the solubility of the cosurfactant in oil increases. On the other hand, oils that penetrate in the palisade layer, such as p-xylene, induce micellar growth and have a thickening effect at a given micellar composition. Thermodynamic considerations are used to explain the experimental results.