Chemistry at the liquid-vapor interface of solutions can differ from that of bulk solutions. These differences were studied with droplets of chloroiodomethane and diiodomethane solutions in water and salt water.  Streams of droplets were formed with a vibrating-orifice aerosol generator. The diameter was controlled from 50-140 �m to change the droplets' surface area to volume ratio, thereby increasing any interfacial effects. Droplets were exposed to ultraviolet light using a Pen-ray lamp (254 nm) or lasers (224 nm, 266 nm). Analysis was conducted using gas chromatography-mass spectrometry; the amount of dihalogenated methane in UV exposed samples was compared to unexposed samples. Although smaller droplets showed greater ranges of reaction than larger ones, variability in the results has rendered them inconclusive. One potential reason is that the droplets were not sufficiently small to demonstrate interfacial effects. Experiments on smaller droplets made with another technique are underway and will be discussed.

Photolysis at the liquid-vapor interface of dihalogenated methane solutions

244th National Meeting (2012)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.