Characterization of water uptake on atmospherically relevant surfaces

COLL 287

Samar G. Moussa, smoussa@uci.edu1, Theresa M. McIntire, mcintire@uci.edu1, Martina Roeselová, roesel@uochb.cas.cz2, Milan Szori, milan.szori@uochb.cas.cz2, Neelanjana Sengupta1, Douglas J. Tobias, dtobias@uci.edu1, Jonathan D. Raff, jraff@uci.edu1, and Barbara J. Finlayson-Pitts, bjfinlay@uci.edu1. (1) Department of Chemistry, University of California, 1102 Natural Science 2, Irvine, CA 92697-2025, (2) Institute of Organic Chemistry and Biochemistry and Center for Biomolecules and Complex Molecular Systems, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, CZ-16610 Prague, Czech Republic
Urban surfaces such as buildings, windows, vegetation and aerosols in the troposphere have different reactivity depending on their chemical and physical properties. These surfaces are known to hold adsorbed inorganic and organic compounds. Chemistry occurring in thin water films adsorbed on these surfaces is believed to play a major role in atmospheric reactions. Self-assembled monolayers (SAMs) are used to mimic organics on surfaces including aerosols and airborne dust. We report uptake of water on a variety of surfaces ranging from hydrophilic (glass) to hydrophobic (glass coated SAMs). Adsorption isotherms for water were compared as well as the shape of the water infrared absorption bands in order to examine differences in the interaction of water with these surfaces. Experimental results were compared to molecular dynamic simulations in order to provide insight into the nature of water on these surfaces.
 

The Physical Chemistry of Environmental Interfaces
9:00 AM-1:10 PM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 225, Oral

Division of Colloid & Surface Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008