Charge Effects on the Photodegradation of Single Optically Trapped Oleic Acid Aerosol Droplets
Abstract
It has recently been reported that reactions can occur faster in microdroplets than in extended condensed matter. The electric charge of droplets has also been suggested as a possible cause of this phenomenon. Here, we investigate the influence of electric charges on the photodegradation of single, optically trapped oleic acid aerosol droplets in the absence of other reactive species. The temporal evolution of the chemical composition and the size of droplets with charge states ranging from 0 to 104 elementary charges were retrieved from Raman spectra and elastic light scattering, respectively. No influence of the droplet charge was observed, either on the chemical composition or on the kinetics. Based on a kinetic multilayer model, we propose a reaction mechanism with the photoexcitation of oleic acid into an excited state, subsequent decay into intermediates and further photoexcitation of intermediates and their decay into nonvolatile and volatile products. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000558317Publication status
publishedExternal links
Journal / series
The Journal of Physical Chemistry AVolume
Pages / Article No.
Publisher
American Chemical SocietyOrganisational unit
03961 - Signorell, Ruth / Signorell, Ruth
Funding
200306 - How weak intermolecular interactions govern the formation and properties of clusters and aerosol droplets (SNF)
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Is supplemented by: https://doi.org/10.3929/ethz-b-000554684
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