Electrophoretic motion of a soft spherical particle in a nanopore

Mingkan Zhang; Ye Ai; Dong Soo Kim; Jun Ho Jeong; Sang W. Joo; Shizhi Qian

doi:10.1016/j.colsurfb.2011.06.027

Electrophoretic motion of a soft spherical particle in a nanopore

Mingkan Zhang, Ye Ai, Dong Soo Kim, Jun Ho Jeong, Sang W. Joo, Shizhi Qian

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

Many biocolloids, biological cells and micro-organisms are soft particles, consisted with a rigid inner core covered by an ion-permeable porous membrane layer. The electrophoretic motion of a soft spherical nanoparticle in a nanopore filled with an electrolyte solution has been investigated using a continuum mathematical model. The model includes the Poisson-Nernst-Planck (PNP) equations for the ionic mass transport and the modified Stokes and Brinkman equations for the hydrodynamic fields outside and inside the porous membrane layer, respectively. The effects of the " softness" of the nanoparticle on its electrophoretic velocity along the axis of a nanopore are examined with changes in the ratio of the radius of the rigid core to the double layer thickness, the ratio of the thickness of the porous membrane layer to the radius of the rigid core, the friction coefficient of the porous membrane layer, the fixed charge inside the porous membrane layer of the particle and the ratio of the radius of the nanopore to that of the rigid core. The presence of the soft membrane layer significantly affects the particle electrophoretic mobility.

Original language	English
Pages (from-to)	165-174
Number of pages	10
Journal	Colloids and Surfaces B: Biointerfaces
Volume	88
Issue number	1
DOIs	https://doi.org/10.1016/j.colsurfb.2011.06.027
State	Published - Nov 1 2011
Externally published	Yes

Funding

This work was supported by the Korea Institute of Machinery & Materials (KIMM), Grant No. 2011-0014246 of National Research Foundation of Korea , and the World Class University Grant No. R32-2008-000-20082-0 of the Ministry of Education, Science and Technology of Korea.

Funders	Funder number
World Class University	R32-2008-000-20082-0
Korea Institute of Machinery and Materials	2011-0014246
National Research Foundation of Korea
Ministry of Education, Science and Technology

Keywords

Double layer polarization (DLP)
Electrical double layer (EDL)
Electrophoresis
Nanopore
Soft particle

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AU - Kim, Dong Soo

AU - Jeong, Jun Ho

AU - Joo, Sang W.

AU - Qian, Shizhi

PY - 2011/11/1

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Electrophoretic motion of a soft spherical particle in a nanopore

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