Interaction of nitrogen dioxide (NO2) with a monolayer of oleic acid at the air–water interface – A simple proxy for atmospheric aerosol |
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| Authors: | Martin D King Adrian R Rennie Christian Pfrang Arwel V Hughes Katherine C Thompson |
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| Institution: | 1. Department of Earth Science, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK;2. Department of Physics, Uppsala University, 75121 Uppsala, Sweden;3. Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, UK;4. ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 3QZ, UK;5. Department of Biological Sciences, Birkbeck University of London, Malet Street, London WC1E 7HX, UK;1. Centro de Ciências Moleculares e Materiais, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;2. Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;3. Centro de Química de Évora, Universidade de Évora, Rua Romão Ramalho 59, 7002-554 Évora, Portugal;4. Área Departamental de Engenharia Química, Instituto Superior de Engenharia de Lisboa, Av. Conselheiro Emídio Navarro, 1, 1959-007 Lisboa, Portugal;5. Laboratorio de Óptica, Lasers e Sistemas, Departamento de Física, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;6. Institut für Anorganische und Angewandte Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg, Germany;1. School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, People''s Republic of China;2. Fraunhofer Institute for Nondestructive Testing (IZFP), Dresden D-01109, Germany;3. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, People''s Republic of China;1. Laboratoire de Chimie quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles, 50, ave. Roosevelt, B-1050, Belgium;2. Department of Chemistry, University of Oxford, Oxford, United Kingdom;3. Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento, 4, I-40136 Bologna, Italy |
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| Abstract: | The reactions between atmospheric oxidants and organic amphiphiles at the air–water interface of an aerosol droplet may affect the size and critical supersaturation required for cloud droplet formation. We demonstrate that no reaction occurs between gaseous nitrogen dioxide (1000 ppm in air) and a monolayer of an insoluble amphiphile, oleic acid (cis-9-octadecenoic acid), at the air–water interface which removes material from the air–water interface. We present evidence that the NO2 isomerises the cis-9-octadecenoic (oleic) acid to trans-9-octadecenoic (elaidic) acid. The study presented here is important for future and previous studies of (1) the reaction between the nitrate radical, NO3, and thin organic films as NO2 is usually present in high concentrations in these experimental systems and (2) the effect of NO2 air pollution on the unsaturated fatty acids and lipids found at the air–liquid surface of human lung lining fluid. |
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