Diffusiophoretic Motion of a Charged Spherical Particle in a Nanopore

Title
Diffusiophoretic Motion of a Charged Spherical Particle in a Nanopore
Author(s)
주상우이상윤에렌얄신스즈첸바이살[바이살]
Keywords
ELECTRON-CONDUCTING MICROCHANNELS; DOUBLE-LAYER THICKNESS; FIBROUS POROUS-MEDIA; 2 PLANE WALLS; ELECTROPHORETIC MOTION; CAPILLARY SLIT; CYLINDRICAL PARTICLES; ELECTROOSMOTIC FLOWS; COLLOIDAL SPHERES; SURFACE PHENOMENA
Issue Date
201005
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.114, no.19, pp.6437 - 6446
Abstract
The diffusiophoretic motion of a charged spherical particle in a nanopore, subjected to an axial electrolyte concentration gradient, is investigated using a continuum theory, which consists of the ionic mass conservation equations for the ionic concentrations, the Poisson equation for the electric potential in the solution, and the Stokes equations for the hydrodynamic field. With the concentration gradient imposed, the particle motion is induced by two different mechanisms: an electrophoresis generated by the induced electric field arising from the difference of ionic diffusivities and the double layer polarization (DLP) and a chemiphoresis by the resulting osmotic pressure gradient induced by the solute gradient in the electrical double layer around the particle. The particle diffusiophoretic velocity along the axis of the nanopore is computed as functions of the ratio of the particle size to the thickness of the electrical double layer, the ratio of the nanopore size to the particle size, the particle surface charge density, and the properties of the salt solution. The diffusiophoretic behavior of a particle comparable to the nanopore size is governed predominantly by the induced electrophoresis generated by the DLP-induced electric field, caused by the imposed concentration gradient and the double layer compression due to the presence of the impervious nanopore wall.
URI
http://hdl.handle.net/YU.REPOSITORY/22502http://dx.doi.org/10.1021/jp9114207
ISSN
1520-6106
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공과대학 > 기계공학부 > Articles
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