Electrokinetic ion and fluid transport in nanopores functionalized by polyelectrolyte brushes

Title
Electrokinetic ion and fluid transport in nanopores functionalized by polyelectrolyte brushes
Author(s)
주상우Li-Hsien Yeh[Li-Hsien Yeh]Mingkan Zhang[Mingkan Zhang]닝후스즈첸Jyh-Ping Hsu[Jyh-Ping Hsu]
Keywords
SOLID-STATE NANOPORES; CURRENT RECTIFICATION; CONCENTRATION POLARIZATION; NANOFLUIDIC CHANNELS; DNA TRANSLOCATION; SINGLE NANOCHANNELS; CONICAL NANOPORE; SELECTIVITY; GATE; FLOW
Issue Date
201207
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.4, no.16, pp.5169 - 5177
Abstract
Chemically functionalized nanopores in solid-state membranes have recently emerged as versatile tools for regulating ion transport and sensing single biomolecules. This study theoretically investigated the importance of the bulk salt concentration, the geometries of the nanopore, and both the thickness and the grafting density of the polyelectrolyte (PE) brushes on the electrokinetic ion and fluid transport in two types of PE brush functionalized nanopore: PE brushes are end-grafted to the entire membrane surface (system I), and to its inner surface only (nanopore wall) (system II). Due to a more significant ion concentration polarization (CP), the enhanced local electric field inside the nanopore, the conductance, and the electroosmotic flow (EOF) velocity in system II are remarkably smaller than those in system I. In addition to a significantly enhanced EOF inside the nanopore, the direction of the flow field near both nanopore openings in system I is opposite to that of EOF inside the nanopore. This feature can be applied to regulate the electrokinetic translocation of biomolecules through a nanopore in the nanopore-based DNA sequencing platform.
URI
http://hdl.handle.net/YU.REPOSITORY/27692http://dx.doi.org/10.1039/c2nr31069d
ISSN
2040-3364
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공과대학 > 기계공학부 > Articles
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