Ion Concentration Polarization in Polyelectrolyte-Modified Nanopores

Title
Ion Concentration Polarization in Polyelectrolyte-Modified Nanopores
Author(s)
스즈첸Li-Hsien Yeh[Li-Hsien Yeh]Mingkan Zhang[Mingkan Zhang]Jyh-Ping Hsu[Jyh-Ping Hsu]Shiojenn Tseng[Shiojenn Tseng]
Keywords
SOLID-STATE NANOPORES; CURRENT RECTIFICATION; SINGLE NANOCHANNELS; DNA TRANSLOCATION; CHANNELS; SELECTIVITY; PARTICLES; MEMBRANES; PROTEINS
Issue Date
201204
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.116, no.15, pp.8672 - 8677
Abstract
Nanopores functionalized with synthetic or biological polyelectrolyte (PE) brushes have significant potentials to rectify ionic current and probe single biomacromolecules. In this work, electric-field-induced ion transport and the resulting conductance in a PE-modified nanopore are theoretically studied using a continuum-based model, composed of coupled Poisson-Nernst-Planck (PNP) equations for the ionic mass transport, and Stokes and Brinkman equations for the hydrodynamic fields in the exterior and interior of the PE layer, respectively. Because of the competition between the transport of counterions and co-ions in the nanopore, two distinct types of ion concentration polarization (CP) occur at either opening of the PE-modified nanopore. These distinct CP behaviors, which significantly affect the nanopore conductance, can be easily manipulated by adjusting the bulk salt concentration and the imposed potential bias. The induced CP in the PE- modified nanopore is more appreciable than that in the corresponding bare solid-state nanopore.
URI
http://hdl.handle.net/YU.REPOSITORY/28598http://dx.doi.org/10.1021/jp301957j
ISSN
1932-7447
Appears in Collections:
공과대학 > 기계공학부 > Articles
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