Issue 21, 2006

Ozonolysis and photolysis of alkene-terminated self-assembled monolayers on quartznanoparticles: implications for photochemical aging of organic aerosol particles

Abstract

Photolysis of alkene-terminated self assembled monolayers (SAM) deposited on Degussa SiO2 nanoparticles is studied following oxidation of SAM with a gaseous ozone/oxygen mixture. Infrared cavity ring-down spectroscopy is used to observe gas-phase products generated during ozonolysis and subsequent photolysis of SAM in real time. Reactions taking place during ozonolysis transform alkene-terminated SAM into a photochemically active state capable of photolysis in the tropospheric actinic window (λ > 295 nm). Formaldehyde and formic acid are the observed photolysis products. Photodissociation action spectra of oxidized SAM and the observed pattern of gas-phase products are consistent with the well-established Criegee mechanism of ozonolysis of terminal alkenes. There is strong evidence for the presence of secondary ozonides (1,3,4-trioxalones) and other peroxides on the oxidized SAM surface. The data imply that photolysis plays a role in atmospheric aging of primary and secondary organic aerosol particles.

Graphical abstract: Ozonolysis and photolysis of alkene-terminated self-assembled monolayers on quartz nanoparticles: implications for photochemical aging of organic aerosol particles

Article information

Article type
Paper
Submitted
22 Feb 2006
Accepted
11 Apr 2006
First published
25 Apr 2006

Phys. Chem. Chem. Phys., 2006,8, 2506-2512

Ozonolysis and photolysis of alkene-terminated self-assembled monolayers on quartz nanoparticles: implications for photochemical aging of organic aerosol particles

J. Park, A. L. Gomez, M. L. Walser, A. Lin and S. A. Nizkorodov, Phys. Chem. Chem. Phys., 2006, 8, 2506 DOI: 10.1039/B602704K

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