کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
596318 1454041 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solubilization and interfacial curvature in microemulsions: I. Interfacial expansion and co-extraction of oil
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Solubilization and interfacial curvature in microemulsions: I. Interfacial expansion and co-extraction of oil
چکیده انگلیسی

We show that solubilization in microemulsion droplets is best described as a combination of interfacial adsorption and internal absorption. We progressively add solute to a Winsor type I system, and simultaneously measure the amount of solute at the oil–water interface and its effect on the interfacial curvature. We determine the relationship between the effective packing parameter and the amount of solute adsorbed at the oil–water interface. For four solutes, a significant amount of oil is co-extracted with solute into the interfacial film. Moreover, we show that solubilization in microemulsions can be characterized by two physical quantities with precise meaning: (1) the increase in interfacial area per molecule of adsorbed solute and (2) the number of oil molecules co-extracted with each solute molecule into the interfacial film. To quantify these effects, we introduce the constant interfacial thickness (CIT) model. It provides a general relationship between curvature, packing and interfacial composition in oil/water/surfactant/solute mixtures. Finally, we show that these results can be used to calculate the free energy of transfer of solute and oil from the droplet core to the interface.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 331, Issues 1–2, 10 December 2008, Pages 31–39
نویسندگان
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