Electrophoresis of a dielectric particle in strong electric field
UDC
532.5.013:532.516:538.5:544.6DOI:
https://doi.org/10.31429/vestnik-18-4-33-40Abstract
This paper is devoted to the problem of motion of a dielectric microparticle in a strong electric field. For the case of a low electric field strength, a comparison of the electrophoresis rate obtained from the force balance condition with the classical Helmholtz-Smoluchowski formula showed good agreement. Direct numerical simulation of the problem in the full uncomplicated formulation for high electric field strength showed that at the interface between the solid particle and the electrolyte a region of spatial charge is formed, which was previously discovered for ion-selective microparticles. In an electric field of sufficiently high intensity, a part of the spatial charge detaches from the surface of the particle, which is swept away by the flow of the advancing liquid. This charge does not disintegrate and is preserved at a distance of several radii from the surface of the microparticle. Thus, there is a violation of the condition of local electroneutrality of the electrolyte solution at a sufficiently large distance from the surface of the microparticle.
Keywords:
electrophoresis, dielectric particle, Nernst-Planck-Poisson-Stokes system, strong electric field, non-equilibrium processesAcknowledgement
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Copyright (c) 2022 Frants E.A., Shelistov V.S., Ganchenko G.S., Gorbacheva E.V., Alekseev M.S., Demekhin E.A.
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