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Differential Ion Transport Induced Electroosmosis and Internal

Summary: Differential Ion Transport Induced
Electroosmosis and Internal
Recirculation in Heterogeneous Osmosis
R. Qiao, J. G. Georgiadis, and N. R. Aluru*
Department of Mechanical and Industrial Engineering, Beckman Institute for
AdVanced Science & Technology, NSF Science & Technology Center of AdVanced
Materials for Purifcation of Water with Systems, UniVersity of Illinois at
Urbana-Champaign, Urbana, Illinois 61801, and Department of Mechanical
Engineering, Clemson UniVersity, Clemson, South Carolina 29631
Received February 2, 2006; Revised Manuscript Received March 23, 2006
Water and ion transport through a heterogeneous membrane separating two electrolyte solutions at different concentrations is investigated
by using molecular dynamics simulations. The membrane features pairs of oppositely charged pores with identical diameters. Simulation
results indicate that the differential transport of K+ and Cl- ions through the membrane pores creates an electrical potential difference across
the membrane, which then induces an electroosmotic water flux. The induced electroosmosis creates an internal recirculation loop of water
between adjacent pores. The implications of these new observations are discussed.
Water transport through artificial or natural membranes by
osmosis is of fundamental importance in many engineering
and biological applications, for example, water purification,


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


Collections: Engineering; Materials Science