COLL 54 |
| Kevin A. Becraft1, Fred G Moore2, and Geraldine L. Richmond1. (1) Department of Chemistry, University of Oregon, Eugene, OR 97403, (2) Department of Physics, Whitman College, Walla Walla, WA 99362-2083 |
| We report in-situ spectroscopic measurements of the structure and orientation of molecules in the interfacial region between the semi-soluble ionic solid CaF2 (fluorite) and an aqueous phase. We employ the surface specific technique, vibrational sum-frequency spectroscopy (VSFS), to study the effect that adsorption of a variety of surfactants has on the bonding interactions of interfacial water molecules, the ion exchange behavior of the ionic solid, and the electrical properties within the interfacial region. These studies demonstrate the complex nature of the interactions of semi-soluble solids with an aqueous phase and the complexity of the surfactant adsorption process. Fundamental studies such as these are essential for understanding the mechanisms involved in surfactant adsorption and interfacial charge reversal; information which is important for industrially relevant processes such as mineral ore flotation, waste processing and petroleum recovery |
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Symposium in Memory of Arthur W. Adamson
2:00 PM-5:40 PM, Sunday, March 28, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |