title: Induced-charge electroosmotic flow around dielectric particles in uniform electric field.
abstract: The current research of induced-charge electroosmotic flow (ICEOF) is mostly confined to systems with ideally or fully polarizable surfaces (e.g., metal). However, most materials in nature have various degrees of polarizability, which directly affects the induced charges and subsequently the induced-charge electroosmotic flow. This paper studied the effect of the polarizability of the materials on the ICEOF. An analytical expression of the induced potential on the surface of a dielectric particle in a uniform electrical field was derived. Three-dimensional transient numerical simulations of the ICEOF and the motion of dielectric particles were performed to study the effect of the polarizability. Simulation results show that the transportation of the dielectric particle in a microchannel is not affected by the polarizability of the particle; however, the interaction of two dielectric particles is sensitive to the polarizability of the particles.
authors.affiliation: Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Fang
authors.initials: F
authors.lastname: Zhang
authors.forename: Dongqing
authors.initials: D
authors.lastname: Li
keywords: Dielectric particle; ICEOF; Induced surface potential; Induced-charge electroosmotic flow; Polarizability; induced-charge electroosmotic flow