COLL 125 |
| Changyong Park1, Paul Fenter1, John. R. Regalbuto2, and Neil C. Sturchio3. (1) Environmental Research Division, Argonne National Laboratory, Argonne, IL 60439, (2) Dept. of Chemical Engineering, University of Illinois at Chicago, 810 S. Clinton, Chicago, IL 60607, (3) Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL 60607 |
| The association of noble metal solution complexes with oxide surfaces has been understood largely through the use of electrostatic adsorption models such as the revised physical adsorption model. Little is known, however, about the actual spatial distribution of these adsorbed species at the interfaces. High-resolution x-ray reflectivity was used to measure the structure in terms of electron density profile for electrostatically adsorbed metal complexes, in particular, the adsorption of platinum tetraammine (PTA) complexes to the quartz (100)-water interface. Measurements at pH 10 in 200 ppm Pt solution reveal substantial changes in the x-ray reflectivity data upon adsorption of the Pt complex indicating specific adsorption of the complex and resulting in significant changes to the quartz-water interfacial structure. Information concerning the height and coverage of the adsorbed Pt complexes is determined from these data and will be ompared with previous results derived from electrostatic models. |
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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 |