Nano Archive

Ionic selectivity of single nanochannels

Vlassiouk, Ivan and Smirnov, Sergei and Siwy, Zuzanna (2008) Ionic selectivity of single nanochannels. NANO LETTERS, 8 (7). pp. 1978-1985.

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Official URL: http://pubs.acs.org/doi/full/10.1021/nl800949k

Abstract

There has been an increasing interest in single nanochannel ionic devices, such as ionic filters that control the type of transported ions and ionic diodes that rectify the ionic flow. In this article, we theoretically investigate the importance of the dimensions, surface charge, electrolyte concentration, and applied bias on nanopore performance. We compare numerical solutions of the Poisson, Nernst-Planck (PNP), and Navier-Stokes (NS) equations with their one-dimensional, analytical approximations. We show that by decreasing the length of the nanopore, the ionic current and ionic selectivity become affected by processes outside the nanochannel. The contribution of electroosmosis is noticeable, especially for highly charged nanochannels, but is insignificant, justifying the use of the simple one-dimensional approximation in many cases. Estimates for the critical electric field at which the nanopore selectivity decreases and the ion current starts to saturate are provided.

Item Type:Article
Uncontrolled Keywords:CYLINDRICAL CAPILLARY; NANOTUBULE MEMBRANES; ELECTROKINETIC FLOW; CONTINUUM-THEORIES; BROWNIAN DYNAMICS; NANOFLUIDIC DIODE; TRANSPORT; CHANNELS; SURFACES; MODELS
Subjects:Physical Science > Nano objects
Material Science > Nanostructured materials
ID Code:6038
Deposited By:IoN
Deposited On:15 Sep 2009 10:22
Last Modified:15 Sep 2009 10:22

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