Collisions and reactions of hydrochloric acid and ozone with functionalized self-assembled monolayers

COLL 16

Larry R. Fiegland, lfieglan@vt.edu1, Brian Scott Day2, and John R. Morris, morris@vt.edu1. (1) Department of Chemistry, Virginia Tech, Blacksburg, VA 24061, (2) Department of Chemistry, Marshall University, 400 Hal Greer Blvd, Huntington, WV 25755
The objectives of this work are aimed at elucidating the atomic-scale mechanisms of interfacial bonding, diffusion, and reactions that govern gas-surface interactions on organic materials. This presentation will focus on recent molecular beam scattering studies of HCl and ozone collisions with self-assembled monolayers (SAMs). The gases represent two important atmospheric species and the SAMs are chosen to resemble the characteristics of surfactant-covered organic aerosols that are also prevalent in the environment. These studies reveal how the atomic-scale nature of organic surfaces determine the extent of energy transfer, thermal accommodation, and subsequent reaction pathways. The experiments involving HCl impinging on OH-terminated SAMs have revealed that HCl can form 24 kJ/mol hydrogen-bonds with the monolayer, but the interaction is not sufficient to result in proton-transfer reactions. In the case of ozone colliding with an ethylene SAM, reactions appear to produce carboxylic-acid
 

Environmental Interfaces
8:30 AM-12:00 PM, Sunday, 10 September 2006 Sir Francis Drake -- Empire Room, Oral

Division of Colloid & Surface Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006