DC-electrokinetic motion of colloidal cylinder(s) in the vicinity of a conducting wall

Date
2022-06
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Source Title
Electrophoresis
Print ISSN
0173-0835
Electronic ISSN
1522-2683
Publisher
Wiley-VCH Verlag GmbH & Co. KGaA
Volume
43
Issue
12
Pages
1263 - 1274
Language
English
Type
Article
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Abstract

The boundary effects on DC-electrokinetic behavior of colloidal cylinder(s) in the vicinity of a conducting wall is investigated through a computational model. The contribution of the hydrodynamic drag, gravity, electrokinetic (i.e., electrophoretic and dielectrophoretic), and colloidal forces (i.e., forces due to the electrical double layer and van der Waals interactions) are incorporated in the model. The contribution of electrokinetic and colloidal forces are included by introducing the resulting forces as an external force acting on the particle(s). The colloidal forces are implemented with the prescribed expressions from the literature, and the electrokinetic force is obtained by integrating the corresponding Maxwell stress tensor over the particles' surfaces. The electrokinetic slip-velocity together with the thin electrical double layer assumption is applied on the surfaces. The position and velocity of the particles and the resulting electric and flow fields are obtained and the physical insight for the behavior of the colloidal cylinders are discussed in conjunction with the experimental observations in the literature.

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Keywords
Boundary element method, Colloidal cylinders, Colloidal forces, Dielectrophoresis, Electrophoresis
Citation
Published Version (Please cite this version)