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Ionic Transport Phenomena in Nanofluidics: Experimental and Theoretical Study of the Exclusion-Enrichment Effect on a Chip

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Adrien Plecis,* Reto B. Schoch, and Philippe Renaud

Microsystems Laboratory, STI-LMIS, EPFL, CH-1015 Lausanne, Switzerland

Nano Lett., 2005, 5 (6), pp 1147–1155

DOI: 10.1021/nl050265h

Publication Date (Web): April 29, 2005

Section:

Surface Chemistry and Colloids

Abstract

In nanometer-sized apertures with charged surfaces, the extension of the electrical double layer results in the electrostatic exclusion of co-ions and enrichment in counterions, which affects the permselectivity of such structures. A modeling of this phenomenon is proposed and is compared with quantitative measurements of the ionic permeability change of a Pyrex nanoslit at low ionic strength. The comparison of experimental results with theoretical predictions justifies that electrostatic forces are the governing forces in nanofluidics.

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