کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
598026 1454080 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixed vesicles and mixed micelles of the cationic–cationic surfactant system: Didecyldimethylammonium bromide/dodecylethyldimethylammonium bromide/water
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Mixed vesicles and mixed micelles of the cationic–cationic surfactant system: Didecyldimethylammonium bromide/dodecylethyldimethylammonium bromide/water
چکیده انگلیسی

The spontaneous formation of mixed vesicles, and their coexistence and solubilization due to the formation of mixed micelles have been investigated on the aqueous solutions of a mixed surfactant system constituted by two cationic surfactants: a C10-double-chain surfactant, didecyldimethylammonium bromide (di-C10DMAB), and a C12-single-chain surfactant, dodecylethyldimethylammonium bromide (C12EDMAB). The concentration at which the monomer-to-mixed vesicle transition occurs CVC*, as well as the concentration at which mixed micelles start to form and coexist with mixed vesicles (the so-called CMC*) have been determined from conductometric experiments at several compositions of the system. The surface characteristics of the vesicle aggregates have been also analyzed by means of laser-Doppler electrophoresis (LDE) experiments, which allow for the determination of ζ-potential and surface charge density. Theoretical calculations of the effective packing parameter allows for the analysis of the aggregation behaviour of the mixed system from a molecular point of view. The effect of lengthening the double chain of the vesicle forming surfactant, and/or the influence of the charge of the single-chain micelle forming surfactant on the self-organization properties of the mixed systems have been discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 292, Issues 2–3, 15 January 2007, Pages 165–172
نویسندگان
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