COLL 376 |
| Vicki H. Grassian, Department of Chemistry, Department of Chemistry, The University of Iowa, Iowa City, IA 52242 |
| Transmission and ATR FT-IR spectroscopy has been used to investigate the surface chemistry of oxide and carbonate particles and single crystal surfaces under ambient conditions of temperature and relative humidity. In particular, the uptake of trace atmospheric gases such as nitric acid and sulfur dioxide under dry and wet (20 %RH) conditions on MgO and CaCO3 has been monitored. Surface adsorbed water enhances the extent of uptake of these gases at room temperature, particularly for nitric acid. In the case of nitric acid uptake, nitrate salt films form under wet conditions. As will be discussed, several phase transitions in these thin nitrate films can be observed as a function of relative humidity. These transitions depend on film thickness and surface roughness. |
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Vibrational Analyses of Dry and Wet Surfaces
8:30 AM-11:30 AM, Wednesday, March 31, 2004 Marriott -- Grand Ballroom H, Oral
Division of Colloid and Surface Chemistry |