کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
612366 880696 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Use of a cell model for the evaluation of the dynamic mobility of spherical silica suspensions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Use of a cell model for the evaluation of the dynamic mobility of spherical silica suspensions
چکیده انگلیسی

In this paper we evaluate the validity of a cell model for the calculation of the dynamic mobility of concentrated suspensions of spheres. The key point is the consideration of the boundary conditions (electrical and hydrodynamic) at the boundary of the fluid cell surrounding a single probe particle. The model proposed is based on a universal criterion for the averages of fluid velocity, electric potential, pressure field or electrochemical properties in the cell. The calculations are checked against a wide set of experimental data on the dynamic mobility of silica suspensions with two different radii, several ionic strengths, and two particle concentrations. The comparison reveals an excellent agreement between theory and experiment, and the model appears to be extremely suitable for correctly predicting the behavior of the dynamic mobility, including the changes in the zeta potential, ζ, with ionic strength, the frequency and amplitude of the Maxwell–Wagner–O'Konski relaxation, and the inertial relaxation occurring at the top of the frequency range accessible to our experimental device.

The cell model proposed for the dynamic mobility of concentrated suspensions describes very accurately the behavior for different particle sizes and volume fractions.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 309, Issue 2, 15 May 2007, Pages 342–349
نویسندگان
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