کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
613754 880727 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Anticipating colloidal instabilities in cationic vesicle dispersions by measuring collective motions with dynamic light scattering
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Anticipating colloidal instabilities in cationic vesicle dispersions by measuring collective motions with dynamic light scattering
چکیده انگلیسی

Vesicle dispersions are useful for many applications from medicinal to consumer products. However, using these dispersions requires some knowledge of and control over their colloidal properties. Measuring interparticle interactions between vesicles should allow framing the problem in terms of Smoluchowski kinetic models and consequently anticipating time-dependent aggregation and coalescence for the dispersions. However, this can be a difficult task for many complex mixtures. A primary goal of this paper is to show that it is possible to measure interparticle potential between small vesicles by measuring the concentration-dependent collective motion using dynamic light scattering. These measurements allow determination of the second virial coefficient for the dispersion, providing a convenient platform for summing all contributions to the interaction potential over all vesicle conformations, thus making the analysis of complex mixtures more tractable. As a verification of the approach, a comparison is made to dispersions in which the stability is governed solely by electrostatics, using existing techniques to anticipate instabilities. A second goal of this paper is to build a simple potential model in which the Smoluchowski model can be used to quantitatively anticipate the aggregation behavior of the small vesicle dispersion. Together, these observations constitute a convenient approach to anticipating the behavior of vesicle (and other) dispersions in complex mixtures.

A simple model derived from concentration-dependent collective motions measured by dynamic light scattering is used to anticipate the stability of a dispersion of small, cationic vesicles.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 296, Issue 2, 15 April 2006, Pages 599–607
نویسندگان
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