New Model for Atmospheric Surfactants: Chemical Ageing of Palmitoleic Acid.
Surfactants are omnipresent in the atmosphere and are very likely to alter properties of aerosols which are of key importance for our climate. Palmitoleic acid, POA, is recognised to be one of the most abundant unsaturated surfactants and an important tracer for meat cooking emissions. Despite being detected at comparable atmospheric concentrations to the popular model surfactant oleic acid, POA and its oxidative ageing has not been examined in any detail. We propose the first kinetic study at the air-water interface on FIGARO of this surfactant as a new model for atmospheric aerosols using key atmospheric oxidants (ozone and nitrogen oxides). This study will establish the importance of the chemical identity of the surfactant for kinetic parameters as well as for the film-forming potential of products. As interfacial processes can vary widely even for closely related precursors such as oleic and palmitoleic acids, this experiment lays the foundation for future work on mixed systems as more realistic models for relevant atmospheric processes. d29-POA will be custom-synthesised for this experiment by the Oxford Deuteration Laboratory.
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SEBASTIANI Federica; Richard A. Campbell and PFRANG Christian. (2013). New Model for Atmospheric Surfactants: Chemical Ageing of Palmitoleic Acid.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1234
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