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Surface-Charge-Governed Ion Transport in Nanofluidic Channels

by: Derek Stein, Maarten Kruithof, Cees Dekker
Physical Review Letters, Vol. 93 (Jul 2004), 035901, doi:10.1103/physrevlett.93.035901  Key: citeulike:11862197

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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.


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