Document Detail


Nonlinear response of the surface electrostatic potential formed at metal oxide/electrolyte interfaces. A Monte Carlo simulation study.
MedLine Citation:
PMID:  19836754     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
An analysis of surface potential nonlinearity (psi(0)) at metal oxide/electrolyte interfaces is presented. By using grand canonical Monte Carlo simulations of a simple lattice model of an interface, we show that a correlation exists between ionic strength, as well as surface site densities, and the non-Nernstian response of a metal-oxide electrode. We propose two approaches to deal with the psi(0)-nonlinearity: one based on perturbative expansion of the Gibbs free energy and another based on the assumption of the pH dependence of surface potential slope. The theoretical analysis based on our new potential form gives excellent performance in extreme pH regions, where classical formulae for psi(0) are unjustified. The new formula is general and independent of any underlying assumptions. For this reason, it can be directly applied to experimental surface potential measurements, including those for individual surfaces of single crystals, as we present for data reported by Kallay and Preocanin [6].
Authors:
Piotr Zarzycki; Kevin M Rosso
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Publication Detail:
Type:  Journal Article     Date:  2009-09-06
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  341     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-11-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  143-52     Citation Subset:  -    
Affiliation:
Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA. piotr.zarzycki@pnl.gov
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