COLL 126 |
| Dimitri A. Sverjensky, Department of Earth and Planetary Sciences, Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD 21218 |
| Quantitative characterization of the development of proton surface charge on the surfaces of oxides is necessary for a fundamental understanding of reactions between oxides and aqueous electrolyte solutions. Despite many experimental studies of charge development, few attempts have been made to integrate the results with a theoretical framework that permits prediction. In the present study, 53 sets of proton surface charge data referring to wide ranges of ionic strengths, electrolytes and oxides were analyzed with the aid of the triple-layer model of surface complexation. The application of crystal chemical, electrostatic and thermodynamic theory to the results enables prediction of all the surface complexation parameters needed to calculate proton surface charge for any oxide in 1:1 electrolyte solutions. Assymetric binding of electrolyte ions is built into these predictions. Predicted trends for high dielectric constant solids (e.g. rutile) are opposite to those on low dielectric constant solids (e.g. amorphous silica). |
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The Science and Engineering of Catalyst Preparation
8:30 AM-11:55 AM, Monday, March 29, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |