Electromigration Current Rectification in a Cylindrical Nanopore Due to Asymmetric Concentration Polarization

被引：58

作者：

Jung, Jung-Yeul ^{[1
]}

Joshi, Punarvasu ^{[2
]}

Petrossian, Leo ^{[2
]}

Thornton, Trevor J. ^{[2
]}

Posner, Jonathan D. ^{[1
,3
]}

机构：

[1] Arizona State Univ, Dept Mech & Aerosp Engn, Tempe, AZ 85287 USA

[2] Arizona State Univ, Dept Elect Engn, Tempe, AZ 85287 USA

[3] Arizona State Univ, Dept Chem Engn, Tempe, AZ 85287 USA

来源：

ANALYTICAL CHEMISTRY | 2009年 / 81卷 / 08期

关键词：

ELECTROKINETIC ENERGY-CONVERSION; NANOFLUIDIC CHANNELS; SYNTHETIC NANOPORE; ION-TRANSPORT; MEMBRANE; FLOW; CAPILLARY; DIODE; NANOFILTRATION; MICROCHANNEL;

D O I：

10.1021/ac900318j

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We present experimental measurements of electromigration current through a single cylindrical nanopore. A single cylindrical nanopore with 175 nm diameter was fabricated in silicon in series with two micropores with 2 and 100 mu m diameters. Thick electrical double layers (EDLs) (Ka approximate to 1) exhibit current rectification due to asymmetric concentration polarization while thinner EDLs show nearly symmetric conductance. After the electric field is turned off, electrical current is measured and observed due to redistribution of ions in the concentration polarization layer.

引用

页码：3128 / 3133

页数：6

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