AVS 49th International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP18
FT-IR Investigation of Water Adsorbed on @alpha@-Al@sub 2@O@sub 3@ and MgO at 296 K

Tuesday, November 5, 2002, 5:30 pm, Room Exhibit Hall B2

Session: Surface Science Poster Session
Presenter: H.A. Al-Abadleh, University of Iowa
Authors: H.A. Al-Abadleh, University of Iowa
V.H. Grassian, University of Iowa
Correspondent: Click to Email
Fundamental studies of water adsorption on oxide surfaces are of great interest as the water/oxide interface plays an important role in many if not all environmental chemical processes. In these studies, transmission FT-IR spectroscopy is used to investigate the adsorption of water on @alpha@-Al@sub 2@O@sub 3@ (0001) and MgO (001) surfaces. The FT-IR spectra of the (0001) surface of @alpha@-Al@sub 2@O@sub 3@ and (001) surface of MgO single crystals are measured in the presence of 0.2 to 20 Torr H@sub 2@O vapor pressure corresponding to 1 to 95% relative humidity (RH) at 296 K. The adsorption of D@sub 2@O on the single crystal surfaces of on @alpha@-Al@sub 2@O@sub 3@ and MgO is also carried out in order to obtain additional insight into the behavior of adsorbed water. Water adsorption on nitrate-coated oxide single crystal surfaces are also carried out to investigate the effect of adsorbed ions on the hydrogen bonding network of water on oxide surfaces. The FT-IR spectra are analyzed so as to quantify the amount of water adsorbed on these oxide surfaces under ambient conditions and to determine more about the nature of the adsorbed water layer.