Electrokinetic transport of a spherical gel-layer model particle: inclusion of charge regulation and application to polystyrene sulfonate

Journal of Colloid and Interface Science
Stuart A Allison, Yao Xin

Abstract

An electrokinetic gel-layer model of a spherical, highly charged colloid particle developed previously [S. Allison, J. Colloid Interface Sci. 277 (2004) 248], is extended in several ways. The charge of the particle is assumed to arise from deprotonation of acidic groups that are present, in uniform concentration, over a portion (or all) of the gel layer. Free energy considerations coupled with Poisson-Boltzmann theory are used to estimate how the local electrostatic environment of a charged gel layer alters the local pK(a) of the acidic groups. This modulation of the charge of the colloidal particle, or "charge regulation," can be significant even for colloidal particles with strongly acidic groups at moderate pH if the ambient salt concentration is low. The methodology is applied to the viscosity and electrophoretic mobility data of a particular polystyrene sulfonate latex over a broad range of monovalent salt (NaCl) concentration [M.J. Garcia-Salinas, F.J. de las Nieves, Langmuir 16 (2000) 715]. The experimental data can be accounted for by a gel layer model that decreases in thickness, but does not vanish, as the salt concentration is increased. Viscosity data provides valuable information about the degree of solvation of th...Continue Reading

References

Mar 1, 1993·Proteins·A S YangB Honig
Jan 14, 1999·Journal of Colloid and Interface Science·M Rasmusson, S Wall
Jul 7, 2000·Journal of Colloid and Interface Science·H Ohshima
May 15, 2001·Journal of Colloid and Interface Science·Jozua Laven, Hans N. Stein
Mar 31, 2005·Journal of Colloid and Interface Science·Pascal BorgetCécile Bonnet-Gonnet

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Citations

Dec 23, 2008·Journal of Colloid and Interface Science·Stuart Allison
Dec 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Hiroyuki Ohshima
May 21, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Hiroyuki Ohshima
Oct 26, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Hiroyuki Ohshima

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