‘Exact’ solutions of the full electrokinetic model for soft spherical colloids: Electrophoretic mobility

Electric-field-induced displacement of a charged spherical colloid embedded in an elastic Brinkman medium.

When an electric field is applied to an electrolyte-saturated polymer gel embedded with charged colloidal particles, the force that must be exerted by the hydrogel on each particle reflects a delicate balance of electrical, hydrodynamic, and elastic stresses. This paper examines the displacement of a single charged spherical inclusion embedded in an uncharged hydrogel. We present numerically ex...

The Electrophoretic Mobility of Bare and Soft Spherical Colloids: a Molecular Dynamics Study

Electrophoresis and electroosmosis as determined on the level of a single isolated colloid by use of optical tweezers

Experiments are described on the electrophoretic mobility of a single isolated colloid and the electroosmotic response of the surrounding medium. For that optical tweezers are employed which enable one to trap a particle without any mechanical contact and to measure its position and the forces acting on it with high resolution (±2 nm, ±200 fN). In a custom-made microfluidic cell, the two effect...

Dynamic electrophoretic mobility of concentrated dispersions of spherical colloidal particles. On the consistent use of the cell model.

This paper outlines a complete and self-consistent cell model theory of the electrokinetics of dense spherical colloidal suspensions for general electrolyte composition, frequency of applied field, zeta potential, and particle size. The standard electrokinetic equations, first introduced for any given particle configuration, are made tractable to computation by averaging over particle configura...

An Experimental Test of the Ion Condensation Theory for Spherical Colloidal Particles.

This paper deals with the notion of ion condensation for spherical colloids and, more specifically, with a recent model developed to predict effective charges (Y. Levin, M. C. Barbosa, and M. N. Tamashiro, Europhys. Lett. 41, 123, 1998). Electrophoretic mobility measurements (carried out for a set of well-characterized latexes) were used to find out to what extent this theory is able to account...