期刊
ACS NANO
卷 2, 期 8, 页码 1589-1602出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn800306u
关键词
nanochannel; nanofluidic diode; nanofluidic electronics; bipolar and unipolar devices; Poisson-Nernst-Planck equations
类别
资金
- National Science Foundation [CHE 0747237]
- RCE Pacific Southwest
- National Institutes of Health [NIH S06 GM008136]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0747237] Funding Source: National Science Foundation
Recently reported experimental and theoretical studies of nanofluidic nonlinear devices, such as bipolar and unipolar ionic diodes, have yet to answer the question about the possibility of their further miniaturization. In this Article, we theoretically investigate the effects of size reduction, applied bias, and solution ionic strength in such devices. We compare the numerical solutions of the Poisson, Nernst-Planck (PNP), and Navier-Stokes (NS) equations with their one-dimensional, analytical approximations. We demonstrate that the contribution of electroosmosis is insignificant and find analytical approximations to PNP for bipolar and unipolar diodes that are in good agreement with numerical 3D solutions. We identify the minimal dimensions for such diodes that demonstrate ion current rectification behavior and demonstrate the importance of the edge effect in very short diodes.
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