کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
611974 880689 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sedimentation of concentrated monodisperse colloidal suspensions: Role of collective particle interaction forces
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Sedimentation of concentrated monodisperse colloidal suspensions: Role of collective particle interaction forces
چکیده انگلیسی

The sedimentation velocities and concentration profiles of low-charge, monodisperse hydroxylate latex particle suspensions were investigated experimentally as a function of the particle concentration to study the effects of the collective particle interactions on suspension stability. We used the Kossel diffraction technique to measure the particle concentration profile and sedimentation rate. We conducted the sedimentation experiments using three different particle sizes. Collective hydrodynamic interactions dominate the particle–particle interactions at particle concentrations up to 6.5 vol%. However, at higher particle concentrations, additional collective particle–particle interactions resulting from the self-depletion attraction cause particle aggregation inside the suspension. The collective particle–particle interaction forces play a much more important role when relatively small particles (500 nm in diameter or less) are used. We developed a theoretical model based on the statistical particle dynamics simulation method to examine the role of the collective particle interactions in concentrated suspensions in the colloidal microstructure formation and sedimentation rates. The theoretical results agree with the experimentally-measured values of the settling velocities and concentration profiles.

The sedimentation velocities and concentration profiles of low-charge, monodisperse hydroxylate latex particle suspensions were investigated experimentally as a function of the particle concentration to study the effects of the collective particle interactions on suspension stability.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 322, Issue 1, 1 June 2008, Pages 180–189
نویسندگان
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