Pair Interaction in Electrophoresis of Charged Porous Particles Moving along Their Centerline
Date Issued
2012
Date
2012
Author(s)
Chang, Li-Yang
Abstract
Electrophoresis of two charged porous spheres moving along their line of centers is investigated theoretically, where overlapping and polarization effect of electric double layers are both taken into account. The thickness of electric double layer and fixed charge density of porous spheres are arbitrary. The coupling equations of electric potential, ion concentration, and flow field are linearized by assuming that the external electric field is weak. A pseudo-spectral method based on Chebyshev polynomials is applied to numerically solve the resulting electrokinetic equations.
To clarify the effect of particle interactions on the electrophoretic mobility, the effects of key parameters are examined such as the double layer thickness, fixed charge density, friction coefficient of porous particles, and surface distance between particles. The most curial finding, besides the non-zero interactions between identical particles, is that particle mobility decreases as double layer of two particles touched due to the polarization effect on the role of electric interactions. More interesting findings is that particle mobility may lower than that of the single one when high double layer overlapping is consideration. These findings was not investigated in the corresponding studies of two particle interactions where overlapping of electric double layers or polarization effect is neglected, indicating the importance of these two factors. Particle interactions between two charged porous particles can be used to describe homogeneous concentrated suspensions of polyelectrolyte in a fundamental aspect of colloid science.
Subjects
electrophoresis
charged porous particles
particle interactions
polarization effect
double-layer overlap
pseudo-spectral method
Type
thesis
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