کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
610854 880660 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase behavior of semifluorinated catanionic mixtures: Head group dependence and spontaneous formation of vesicles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Phase behavior of semifluorinated catanionic mixtures: Head group dependence and spontaneous formation of vesicles
چکیده انگلیسی

Hexadecyltrimethylammonium bromide (C16TAB)–sodium perfluorooctanoate (C8FONa) and hexadecylpyridynium bromide (C16PyB)–C8FONa catanionic semifluorinated mixtures have been studied by conductivity, dynamic light scattering (DLS), cryo-transmission electron microscopy (cryo-TEM) and polarizing microscopy. The regular solution theory, applicable for a limited fluorinated molar ratio, does not predict long-range electrostatic interactions. The results are consistent with the fact that in the hydrogenated-rich region the interaction is attractive in both catanionic mixtures. The systems containing pyridinium headgroups were of the stronger interaction. A transition from micelles was found in both mixtures as a function of fluorinated molar ratio. Special attention was devoted to the effect of the head group in the system properties. The information related with the mean vesicle radius measured by DLS was compared with the vesicle size distribution as well as the elastic properties of the bilayer measured with cryo-TEM.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 331, Issue 2, 15 March 2009, Pages 522–531
نویسندگان
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