Influence of dissolved ions on interfacial reactions in salty glycerol

PHYS 385

Jennifer L. DeZwaan, Annabel H. Muenter, and Gil Nathanson. Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706
Molecular beam scattering experiments are used to investigate the effects of ion size and charge on interfacial reactions between gaseous DCl and liquid glycerol. Previous experiments using pure glycerol show that a fraction of the DCl molecules undergo rapid D→H exchange in the interfacial region followed by immediate HCl evaporation before incorporation into the bulk. In a 2.6 M NaI glycerol solution, the dissolved ions are observed to enhance interfacial D→H exchange and suppress bulk DCl solvation. By using different salt solutions of NaBr, KI, LiI and CaI2, we find that the enhancement of interfacial D→H exchange is influenced more by the identity of the cation than the identity of the anion, although recent literature shows the anion to be closer to the surface than the cation. This poster will explore the roles of ion size, charge, and concentration in controlling interfacial interactions between DCl and the alcohol.

Poster Session
7:30 PM-10:00 PM, Wednesday, 13 September 2006 Moscone Center -- Hall D, Poster

8:00 PM-10:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Sci-Mix

Division of Physical Chemistry

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