Direct Numerical Simulations of Electrophoresis of Charged Colloids

Details Direct Numerical Simulations of Electrophoresis of Charged Colloids Direct Numerical Simulations of Electrophoresis of Charged Colloids

2006-01-24

arxiv.org/abs/cond-mat/0601534v3

Phys. Rev. Lett. 96, 208302 (2006)

Physics

Condensed Matter

Soft Condensed Matter

4pages, 3figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.208302

We propose a numerical method to simulate electrohydrodynamic phenomena in charged colloidal dispersions. This method enables us to compute the time evolutions of colloidal particles, ions, and host fluids simultaneously by solving Newton, advection-diffusion, and Navier--Stokes equations so that the electrohydrodynamic couplings can be fully taken into account. The electrophoretic mobilities of charged spherical particles are calculated in several situations. The comparisons with approximation theories show quantitative agreements for dilute dispersions without any empirical parameters, however, our simulation predicts notable deviations in the case of dense dispersions.

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