The Effect of Axial Concentration Gradient on Electrophoretic Motion of a Charged Spherical Particle in a Nanopore

Title
The Effect of Axial Concentration Gradient on Electrophoretic Motion of a Charged Spherical Particle in a Nanopore
Author(s)
주상우이상윤[이상윤]에렌얄신[에렌얄신]스즈첸아슈샬마바이살[바이살]
Keywords
ELECTRIC SURFACE PHENOMENA; DIFFUSIOPHORESIS; NANOTUBE; INTERFACE; CAVITY; PLANE
Issue Date
201009
Publisher
SPRINGER
Citation
MICROGRAVITY SCIENCE AND TECHNOLOGY, v.22, no.3, pp.329 - 338
Abstract
The electrophoretic motion of a charged spherical nanoparticle along the axis of a nanopore connecting two fluid reservoirs, subjected to an axial electric field and electrolyte concentration gradient, has been investigated using a continuum model. The model consists of the Poisson and Nernst-Planck equations for the electric potential and ionic concentrations and the Stokes equations for the hydrodynamic field with zero gravity. In addition to the electrophoresis generated by the externally imposed electric field, the particle also experiences diffusiophoresis arising from the externally imposed concentration gradient. The effects of the diffusiophoresis on the axial electrophoretic motion are examined with changes in the ratio of the particle size to the thickness of the electric double layer (EDL), and the imposed concentration gradient. Since the EDL thickness, the particle size, and the nanopore size are of the same order of magnitude, the diffusiophoresis is dominated by the induced electrophoresis driven by the generated electric field arising from the double-layer polarization (DLP). For a relatively small kappa a (p) , the ratio of the particle size to the EDL thickness, the diffusiophoresis is dominated by the induced electrophoresis from the type II DLP, which propels the particle toward regions with lower salt concentration. Depending on the magnitude and direction of the externally imposed concentration gradient, the electrophoretic motion can be accelerated, decelerated, and even reversed by the diffusiophoresis.
URI
http://hdl.handle.net/YU.REPOSITORY/23713http://dx.doi.org/10.1007/s12217-010-9195-8
ISSN
0938-0108
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공과대학 > 기계공학부 > Articles
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