Electrophoresis of a soft particle normal to a plane

Cheng, Wen-Li; He, Yan-Ying; Lee, Eric

doi:10.1016/j.jcis.2009.02.051

Cited by 24 publications

(31 citation statements)

References 29 publications

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“…Either situation is excluded from the scope of the current analysis. A pseudospectral method adopted by Lee et al [7][8][9] is applied here again for the solution of the resulted governing electrokinetic equations. The method has proven to be a very powerful tool treating electrophoresis problems and other electrokinetic systems.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, it also finds tremendous potential applications in nanotechnology such as a biosensor or a labon-a-chip device [1,2]. While uniform suspensions, either dilute or concentrated, are normally used to investigate the electrophoretic behavior of colloidal particles in fundamental colloid science, systems involving a nearby physical boundary are often encountered in practical applications [3][4][5][6][7]. Among them, the electrophoresis of a colloidal particle near a planar wall has been studied extensively with theoretical approaches.…”

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confidence: 99%

“…(ix) The particle is nonconducting and assumes a constant surface potential, or zeta potential z a . Note also that that the scope of the current theoretical analysis assuming chargeless interface has to be confined to systems with no ions adsorbed to the air-water interface, as observations of surface charges were made in recent years for some specific electrolytes [23].The fundamental electrokinetic equations are as follows [7]:where e is the permittivity of the solution, r the space charge density, e the elementary charge, m the viscosity of the solution, D j the diffusivity of the ionic species j, k B the Boltzmann constant, and T the absolute temperature. In Eqs.…”

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confidence: 99%

“…The mobility of a particle can thus be calculated based on the requirement that the net force acting on the particle surface, the summation of the electric driving force and the retarding hydrodynamic force, must vanish at the quasi-steady state in electrophoresis. The details of the numerical procedure can be found elsewhere [6][7][8]. …”

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Electrophoresis of a spherical particle normal to an air–water interface

Tsai

Lou

et al. 2010

Electrophoresis

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Electrophoresis of a spherical particle normal to an air-water interface is considered theoretically in this study. The presence of the air-water interface is found to reduce the particle mobility in general, especially when the double layer is very thick. This boundary effect diminishes as the double layer gets very thin. The higher the surface potential, the more significant the reduction of mobility due to the polarization effect from the double layer deformation when the particle is in motion. Local extrema are observed in the mobility profiles with varying double layer thickness as a result. Comparison with a solid planar boundary is made. It is found that the particle mobility near an air-water interface is smaller than that near a solid one when the double layer is thick, and vice versa when the double layer is thin, with a critical threshold value of double layer thickness corresponding roughly to the touch of the interface. The reason behind it is clearly explained as the buildup of electric potential at the air-water interface, which reduces the driving force as a result.

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Section: Introductionmentioning

confidence: 99%

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Electrophoresis of a spherical particle normal to an air–water interface

Tsai

Lou

et al. 2010

Electrophoresis

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“…Assuming that the polarization effect is negligible, as well as a very thin double layer, he was able to obtain approximate expressions for the electrokinetic quantities of interest. The polarization effect on the soft particle systems were later investigated [29][30][31] for various electrokinetic phenomena. In particular, Hill et al [33] consider the electrophoresis of spherical polymer-coated colloidal particles.…”

Section: Introductionmentioning

confidence: 99%