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Scaling of Electrokinetic Transport in Nanometer R. Qiao and N. R. Aluru*
 

Summary: Scaling of Electrokinetic Transport in Nanometer
Channels
R. Qiao and N. R. Aluru*
Department of Mechanical and Industrial Engineering, Beckman Institute for Advanced
Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
Received May 3, 2005. In Final Form: July 8, 2005
Electrokinetictransportisapopulartransportmechanismusedinnanofluidicsystems,andunderstanding
its scaling behavior is important for the design and optimization of nanofluidic devices. In this article, we
report on the scaling of electroosmotic flow and ionic conductivity in positively charged slit nanochannels
by using continuum and atomistic simulations. The effects of confinement and surface charge are discussed
in detail. In particular, we found that the viscosity of the interfacial water increases substantially as the
surface charge density increases and the electrophoretic mobility of the interfacial ions decreases. We show
that such effects can influence the scaling of the electrokinetic transport in confined nanochannels
significantly.
1. Introduction
Electrokinetic transport of water and ions in nanometer
channels and pores plays a crucial role in many engineer-
ing and biological systems (e.g., fuel cells, ion channels,
and chemical analysis devices1-5). Understanding the
scaling of electrokinetic transport as a function of various

  

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

 

Collections: Engineering; Materials Science