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Induced Electrokinetic Transport in Micro-Nanofluidic Interconnect Xiaozhong Jin, Sony Joseph, Enid N. Gatimu, Paul W. Bohn, and N. R. Aluru*,
 

Summary: Induced Electrokinetic Transport in Micro-Nanofluidic Interconnect
Devices
Xiaozhong Jin, Sony Joseph, Enid N. Gatimu, Paul W. Bohn, and N. R. Aluru*,
Beckman Institute for AdVanced Science and Technology, UniVersity of Illinois at Urbana-Champaign,
Urbana, Illinois 61801
ReceiVed July 31, 2007. In Final Form: September 25, 2007
Hybrid micro-nanofluidic interconnect devices can be used to control analyte transfer from one microchannel to
the other through a nanochannel under rest, injection, and recovery stages of operation by varying the applied potential
bias. Using numerical simulations based on coupled transient Poisson-Nernst-Planck and Stokes equations, we
examine the electrokinetic transport in a gateable device consisting of two 100 Ám long, 1 Ám wide negatively charged
microchannels connected by a 1 Ám long, 10 nm wide positively charged nanochannel under both positive and negative
bias potentials. During injection, accumulation of ions is observed at the micro-nano interface region with the positive
potential and depletion of ions is observed at the other micro-nano junction region. Net space charge in the depletion
region gives rise to nonlinear electrokinetic transport during the recovery stage due to induced pressure, induced
electroosmotic flow of the second kind, and complex flow circulations. Ionic currents are computed as a function of
time for both positive and negative bias potentials for the three stages. Analytical expressions derived for ion current
variation are in agreement with the simulated results. In the presence of multiple accumulation or depletion regions,
we show that a hybrid micro-nano device can be designed to function as a logic gate.
1. Introduction
During the past 1-2 decades, microfluidic devices have been

  

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

 

Collections: Engineering; Materials Science