Sedimentation Velocity and Potential in a Dilute Suspension of Charged Composite Spheres

Journal of Colloid and Interface Science
H J Keh, Y C Liu

Abstract

The sedimentation of a charged composite particle composed of a solid core and a surrounding porous shell in an electrolyte solution is analytically studied. In the solvent-permeable and ion-penetrable porous surface layer of the particle, idealized hydrodynamic frictional segments with fixed charges are assumed to distribute at a uniform density. The equations which govern the ionic concentration distributions, the electric potential profile, and the fluid flow field inside and outside the surface layer of a charged composite particle migrating in an unbounded solution are linearized assuming that the system is only slightly distorted from equilibrium. Using a perturbation method, these linearized equations are solved for a composite sphere with the charge densities of the rigid core surface and of the surface layer as the small perturbation parameters. An analytical expression for the settling velocity of the composite sphere in closed form is obtained from a balance among its gravitational, electrostatic, and hydrodynamic forces. The result demonstrates that the presence of the fixed charges in the composite sphere slows down its settling velocity relative to that of an uncharged one. A closed-form formula for the sedimentat...Continue Reading

Citations

Dec 14, 2011·The Journal of Chemical Physics·Huan J Keh, Tsung F Cheng
Dec 27, 2005·Journal of Colloid and Interface Science·Huan J Keh, Wei C Chen
Sep 6, 2005·Journal of Colloid and Interface Science·Eric LeeJyh-Ping Hsu
Mar 1, 2012·The Journal of Physical Chemistry. B·Yi Y Wu, Huan J Keh
Sep 18, 2013·The Journal of Physical Chemistry. B·Ya J Chang, Huan J Keh
Jun 2, 2012·The Journal of Physical Chemistry. B·Ping Y Huang, Huan J Keh
Aug 1, 2013·The Journal of Physical Chemistry. B·Wei J Chen, Huan J Keh
Feb 23, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Eric LeeJyh-Ping Hsu
Oct 23, 2018·The Journal of Physical Chemistry. B·Yen Z Yeh, Huan J Keh

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