کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10377533 880737 2005 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of structural variation of alcohols on water solubilization in nonionic microemulsions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
The effect of structural variation of alcohols on water solubilization in nonionic microemulsions
چکیده انگلیسی
This article is the first part of a two-part study that exemplifies how to treat the solubilization of water in multicomponent surfactant-based systems. In particular, it aims at clarifying the role of cosurfactants in water solubilization in these systems. The judicious selection of the components in such systems to maximize water solubilization is occasionally thought to be dictated by the chain length compatibility principle, which may be expressed quantitatively by the BSO (Bansal, Shah, O'Connell) equation. Here we demonstrate some limitations of the equation. For example, in our best model system, C12(EO)8/dodecane + pentanol = 1:1 (by weight)/water at 27±0.2°C, the BSO equation predicts that no alcohol is needed for maximum water solubilization, contrary to our experimental findings. We discuss how to optimize the alcohol/oil weight ratio needed for stabilizing four-component microemulsions. In our model systems C12(EO)8 or C18:1(EO)10/pentanol/dodecane/water, this optimal weight ratio is 1:1. We also highlight the difference between the effect of normal alcohols on water solubilization-which passes via a maximum-and their effect on percolation processes and structured changes of proteins, which depends solely upon the alcohol hydrophobicity. For the investigation of the effect of branching on phase behavior the utilization of an extended form of the geometrical branching factor Fb is suggested. The meaning of this factor is elucidated by comparing it with topological indices.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 291, Issue 1, 1 November 2005, Pages 263-272
نویسندگان
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