Journal
NANO LETTERS
Volume 8, Issue 7, Pages 1978-1985Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl800949k
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Funding
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0747237] Funding Source: National Science Foundation
- NIGMS NIH HHS [S06 GM008136] Funding Source: Medline
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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.
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