Diffusiophoresis of an Elongated Cylindrical Nanoparticle along the Axis of a Nanopore

Title
Diffusiophoresis of an Elongated Cylindrical Nanoparticle along the Axis of a Nanopore
Author(s)
주상우스즈첸이상윤
Keywords
CHARGED SPHERICAL-PARTICLE; ELECTRIC SURFACE PHENOMENA; DOUBLE-LAYER THICKNESS; FIBROUS POROUS-MEDIA; 2 PLANE WALLS; ELECTROLYTE-SOLUTIONS; ELECTROPHORETIC MOTION; CAPILLARY SLIT; FINE CAPILLARIES; COLLOIDAL SPHERE
Issue Date
201010
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMPHYSCHEM, v.11, no.15, pp.3281 - 3290
Abstract
The translation of a charged, elongated cylindrical nanoparticle along the axis of a nanopore driven by an imposed axial salt 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 modified Stokes equations for the hydrodynamic field. The diffusiophoretic motion is driven by the induced electrophoresis and chemiphoresis. The former is driven by the generated overall electric field arising from the difference in the ionic diffusivities and the double layer polarization, while the latter is generated by the induced osmotic pressure gradient around the charged particle. The induced diffusiophoretic motion is investigated as functions of the imposed salt concentration gradient, the ratio of the particle's radius to the double layer thickness, the cylinder's aspect ratio (length/radius), the ratio of the nanopore size to the particle size, the surface charge densities of the nanoparticle and the nanopore, and the type of the salt used. The induced diffusiophoretic motion of a nanorod in an un-charged nanopore is mainly governed by the induced electrophoresis, driven by the induced electric field arising from the double layer polarization. The induced particle motion is driven by the induced electroosmotic flow, if the charges of the nanorod and nanopore wall have the same sign.
URI
http://hdl.handle.net/YU.REPOSITORY/23493http://dx.doi.org/10.1002/cphc.201000433
ISSN
1439-4235
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공과대학 > 기계공학부 > Articles
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