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Electrolytic transport through a synthetic nanometer-diameter pore
 

Summary: Electrolytic transport through a synthetic
nanometer-diameter pore
Chuen Ho*, Rui Qiao
, Jiunn B. Heng*, Aveek Chatterjee
, Rolf J. Timp
, Narayana R. Aluru
, and Gregory Timp*§
*Department of Electrical and Computer Engineering and Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, IL 61801;
and Stanford University, Stanford, CA 94305
Edited by Karl Hess, University of Illinois at Urbana­Champaign, Urbana, IL, and approved June 3, 2005 (received for review January 31, 2005)
We have produced single, synthetic nanometer-diameter pores by
using a tightly focused, high-energy electron beam to sputter
atoms in 10-nm-thick silicon nitride membranes. Subsequently, we
measured the ionic conductance as a function of time, bath con-
centration, and pore diameter to infer the conductivity and ionic
mobility through the pores. The pore conductivity is found to be
much larger than the bulk conductivity for dilute bath concentra-
tions, where the Debye length is larger than the pore radius,
whereas it is comparable with or less than the bulk for high bath
concentrations. We interpret these observations by using multi-

  

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

 

Collections: Engineering; Materials Science