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Surface-charge-induced asymmetric electrokinetic transport in confined silicon nanochannels
 

Summary: Surface-charge-induced asymmetric electrokinetic transport in confined
silicon nanochannels
R. Qiao and N. R. Alurua
Department of Mechanical and Industrial Engineering, Beckman Institute for Advanced Science and
Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Received 1 December 2004; accepted 2 March 2005; published online 28 March 2005
Molecular dynamics simulations of a NaF solution transport in a confined silicon nanochannel
indicated that the water flux and the ionic conductivity through two oppositely charged silicon
channels, that are otherwise similar, differ by a factor of more than three, and the co-ion fluxes are
in the opposite direction. Such a behavior cannot be predicted by the classical electrokinetic
transport theory, and is found to originate from the asymmetric dependence of the transport
properties of water near the charged silicon surface. 2005 American Institute of Physics.
DOI: 10.1063/1.1897430
Electrokinetic transport, referring to the transport of wa-
ter and ions induced by an external electric field, is widely
encountered in many biological and engineering systems,
e.g., ion channels, fuel cells, and chemical analysis
devices.14
Electrokinetic transport is widely used in
nanoscale fluidic systems due to its scalability and

  

Source: Aluru, Narayana R. - Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign

 

Collections: Engineering; Materials Science