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Electrophoresis of large polyelectrolyte-coated colloidal particles

J. J. Liétor-Santos and A. Fernández-Nieves

M. Márquez

Group of Complex Fluids Physics, Department of Applied Physics, University of Almeria, Almeria 04120 Spain

INEST Group–New Technology Research Department, PMUSA, Richmond, Virginia, 23234, USA;
Los Alamos National Laboratory, Chemistry Division, Los Alamos, New Mexico, 87545, USA;
and Harrington Department Bioengineering, Arizona State University, Tempe, Arizona, 85287–9709, USA

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Phys. Rev. E 71, 042401 – Published 14 April, 2005

DOI: https://doi.org/10.1103/PhysRevE.71.042401

Abstract

We perform electrophoretic mobility $μ$ measurements of spherical colloidal particles coated with a charged polyelectrolyte shell versus 1:1 electrolyte concentration $c$ . Instead of the expected Smoluchowski scaling law $μ \sim c^{- \frac{1}{2}}$ for large $κ a$ , with $κ$ the inverse of the Debye length, we find that $μ$ scales as $μ \sim c^{- \frac{1}{3}}$ . We account for this result using a general theory for the electrophoresis of soft particles [H. Ohshima, Adv. Colloid Interface Sci. 62, 189 (1995)] combined with the salt concentration dependence of the shell thickness, as described by Pincus [P. Pincus, Macromolecules 24, 2912 (1991)].

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References (27)

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Electrophoresis of large polyelectrolyte-coated colloidal particles

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