|Title:||Electrophoresis of concentrated spherical particles with a charge-regulated surface||Authors:||Hsu J.-P.
|Issue Date:||2000||Journal Volume:||112||Journal Issue:||14||Start page/Pages:||6404-6410||Source:||Journal of Chemical Physics||Abstract:||
The electrophoretic behavior of spherical colloidal particles is modeled theoretically. The classic analysis is extended to the case of a concentrated dispersion in which the double layer surrounding a particle can assume an arbitrary thickness, and the effect of double-layer polarization is taken into account. Also, the surface of a particle is charge regulated, which leads to a general mixed-type boundary condition, and simulates entities bearing dissociable functional groups such as biological cells and particles with a membrane layer. We show that the absolute surface potential decreases with the increase in £ea, £e and a are, respectively, the reciprocal Debye length and the radius of a particle. The variation of the absolute electrophoretic mobility as a function of £ea is found to have a local maximum. The higher the surface potential the more significant the effect of double-layer polarization, and it becomes insignificant if £ea approaches infinity. ? 2000 American Institute of Physics.
|Appears in Collections:||化學工程學系|
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