Night-time Oxidation: Towards Multi-Reactive Model Systems Representative of Surfactant-Covered Atmospheric Aerosols
Organic layers on atmospheric aerosol strongly influence its behaviour. The rates and relative proportions of surface/bulk chemical reactions of these particles are hardly known and it is becoming apparent that mixed organic aerosol matrices may protect reactive species from oxidative degradation. While studies of monomolecular films provide first constraining parameters for atmospheric models, organic films on aerosols are present as multi-component mixtures and a simple extrapolation from mono- to multi-reactive films will introduce large uncertainties. As a part of ILL’s NEATNOx studentship, we will lay the groundwork for the first studies of mixed films at the air-water interface using night-time oxidants. Kinetic studies of oleic, OA, stearic, SA, and palmitic, PA, acids in reaction with NOx will allow us to pin down the kinetics of these mono-reactive systems, so that we will be able to contrast kinetic parameters in future studies involving mixtures of OA, SA and/or PA. Complementing this proposal, we will use a kinetic model to predict the mixed film behaviour for OA/SA. Kinetic data on PA will allow the first model representation of oxidative ageing of ternary films by NOx
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PFRANG Christian; Richard A. Campbell and SEBASTIANI Federica. (2013). Night-time Oxidation: Towards Multi-Reactive Model Systems Representative of Surfactant-Covered Atmospheric Aerosols. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1187
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