Surface-Charge-Governed Ion Transport in Nanofluidic Channels
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- 15 July 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 93 (3) , 035901
- https://doi.org/10.1103/physrevlett.93.035901
Abstract
A study of ion transport in aqueous-filled silica channels as thin as 70 nm reveals a remarkable degree of conduction at low salt concentrations that departs strongly from bulk behavior: In the dilute limit, the electrical conductances of channels saturate at a value that is independent of both the salt concentration and the channel height. Our data are well described by an electrokinetic model parametrized only by the surface-charge density. Using chemical surface modifications, we further demonstrate that at low salt concentrations, ion transport in nanochannels is governed by the surface charge.Keywords
This publication has 17 references indexed in Scilit:
- Fabrication of solid-state nanopores with single-nanometre precisionNature Materials, 2003
- Origin ofNoise in Membrane Channel CurrentsPhysical Review Letters, 2002
- Ion Permeation and Selectivity of OmpF Porin: A Theoretical Study Based on Molecular Dynamics, Brownian Dynamics, and Continuum Electrodiffusion TheoryJournal of Molecular Biology, 2002
- 2D-Confined Nanochannels Fabricated by Conventional MicromachiningNano Letters, 2002
- Fabrication of 10 nm enclosed nanofluidic channelsApplied Physics Letters, 2002
- Streaming potential and streaming current measurements at planar solid/liquid interfaces for simultaneous determination of zeta potential and surface conductivityColloids and Surfaces A: Physicochemical and Engineering Aspects, 2001
- Ion-beam sculpting at nanometre length scalesNature, 2001
- Entropic Trapping and Escape of Long DNA Molecules at Submicron Size ConstrictionPhysical Review Letters, 1999
- Dielectric behavior of colloidal dispersionsColloids and Surfaces A: Physicochemical and Engineering Aspects, 1994
- Part I.—(B) Streaming effects and surface conduction. Streaming potentials and surface conductanceTransactions of the Faraday Society, 1940