Analytic Expression for Electrophoretic Mobility of Soft Particles with a Hydrophobic Inner Core at Different Electrostatic Conditions

Langmuir : the ACS Journal of Surfaces and Colloids
BhartiHiroyuki Ohshima

Abstract

This paper presents a simplified model for the electrophoresis of a soft particle with a nonwettable rigid core with charged polyelectrolyte corona under a weak-field and low-charge density consideration. We have derived a closed form solution for the mobility, which reduces to the well-known expressions for mobility as derived by Ohshima for limiting cases such as a hydrophilic charged core coated with an uncharged polymer (Ohshima, H. J. Colloid Interface Sci. 2002, 252, 119-125) or an uncharged no-slip core coated with a polyelectrolyte layer (Ohshima, H. Electrophoresis 2006, 27, 526-533). The generalized mobility expression reduces to the existing expression for mobility of a rigid hydrophobic colloid as the soft layer shrinks to zero. The general form of the mobility expression involves elliptic integrals, which can be computed easily through a software like Mathematica. We have derived analytical solutions for mobility pertaining to several particular cases. The occurrence of mobility reversal when the core and polyelectrolyte layer has a charge of opposite polarity is demonstrated in this paper.

References

Feb 3, 2000·Journal of Colloid and Interface Science·D A Saville
Jul 7, 2000·Journal of Colloid and Interface Science·H Ohshima
Jun 29, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Lee P YezekHerman P van Leeuwen
Sep 30, 2005·Environmental Science & Technology·Jérôme F L DuvalJacques Buffle
Dec 31, 2005·Electrophoresis·Hiroyuki Ohshima
Apr 6, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Jérôme F L Duval, Hiroyuki Ohshima
Jan 22, 2009·Journal of Colloid and Interface Science·Julián López-ViotaSilke Krol
Apr 16, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Sagar M AgnihotriKimiko Makino
Dec 7, 2011·Physical Chemistry Chemical Physics : PCCP·Antonio SiberRudolf Podgornik
Dec 12, 2012·Electrophoresis·Hung Mok Park
Sep 27, 2018·Physical Review. E·Saurabh K MauryaH Ohshima

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