Surface-charge-governed ion transport in nanofluidic channels

被引：961

作者：

Stein, D ^{[1
]}

Kruithof, M ^{[1
]}

Dekker, C ^{[1
]}

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.93.035901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：035901 / 1

页数：4

共 22 条

[1]

[Anonymous], FUNDAMENTALS INTERFA

[2]

Attard P., 1996, ADV CHEM, V92, P1, DOI DOI 10.1002/9780470141519.CH1

[3] Exact Poisson-Boltzmann solution for the interaction of dissimilar charge-regulating surfaces [J].

Behrens, SH ;

Borkovec, M .

PHYSICAL REVIEW E, 1999, 60 (06) :7040-7048

[4] The charge of glass and silica surfaces [J].

Behrens, SH ;

Grier, DG .

JOURNAL OF CHEMICAL PHYSICS, 2001, 115 (14) :6716-6721

[5] Fabrication of 10 nm enclosed nanofluidic channels [J].

Cao, H ;

Yu, ZN ;

Wang, J ;

Tegenfeldt, JO ;

Austin, RH ;

Chen, E ;

Wu, W ;

Chou, SY .

APPLIED PHYSICS LETTERS, 2002, 81 (01) :174-176

[6] Ion transport in nanofluidic channels [J].

Daiguji, H ;

Yang, PD ;

Majumdar, A .

NANO LETTERS, 2004, 4 (01) :137-142

[7] Entropic trapping and escape of long DNA molecules at submicron size constriction [J].

Han, J ;

Turner, SW ;

Craighead, HG .

PHYSICAL REVIEW LETTERS, 1999, 83 (08) :1688-1691

[8]

Iler R, 1978, CHEM SILICA

[9] Ion permeation and selectivity of OmpF porin: A theoretical study based on molecular dynamics, brownian dynamics, and continuum electrodiffusion theory [J].

Im, W ;

Roux, B .

JOURNAL OF MOLECULAR BIOLOGY, 2002, 322 (04) :851-869

[10]

LEVINE S, 1974, FARADAY T, V2, P1

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