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The reaction of ole...
The reaction of oleic acid monolayers with gas-phase ozone at the air water interface : the effect of sub-phase viscosity, and inert secondary components
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- King, Martin D. (författare)
- Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England.
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- Jones, Stephanie H. (författare)
- Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England.;Rutherford Appleton Lab, Cent Laser Facil, Res Complex Harwell, Harwell Innovat Campus, Didcot OX11 0FA, Oxon, England.
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- Lucas, Claire O. M. (författare)
- Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England.
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- Thompson, Katherine C. (författare)
- Birkbeck Coll London, Inst Struct & Mol Biol, Dept Biol Sci, Malet St, London WC1E 7HX, England.
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- Rennie, A. R., 1957- (författare)
- Uppsala universitet,Institutionen för fysik och astronomi,Centre for Neutron Scattering
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- Ward, Andrew D. (författare)
- Rutherford Appleton Lab, Cent Laser Facil, Res Complex Harwell, Harwell Innovat Campus, Didcot OX11 0FA, Oxon, England.
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- Marks, Amelia A. (författare)
- Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England.
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- Fisher, Fleur N. (författare)
- Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England.
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- Pfrang, Christian (författare)
- Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England.
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- Hughes, Arwel, V (författare)
- Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Harwell Innovat Campus, Didcot OX11 0FA, Oxon, England.
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- Campbell, Richard A. (författare)
- Inst Laue Langevin, 71 Ave Martyrs, F-38000 Grenoble 9, France.;Univ Manchester, Div Pharm & Optometry, Manchester M13 9PT, Lancs, England.
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Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England.;Rutherford Appleton Lab, Cent Laser Facil, Res Complex Harwell, Harwell Innovat Campus, Didcot OX11 0FA, Oxon, England. (creator_code:org_t)
- 2020
- 2020
- Engelska.
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Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : ROYAL SOC CHEMISTRY. - 1463-9076 .- 1463-9084. ; 22:48, s. 28032-28044
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Organic films that form on atmospheric particulate matter change the optical and cloud condensation nucleation properties of the particulate matter and consequently have implications for modern climate and climate models. The organic films are subject to attack from gas-phase oxidants present in ambient air. Here we revisit in greater detail the oxidation of a monolayer of oleic acid by gas-phase ozone at the air-water interface as this provides a model system for the oxidation reactions that occur at the air-water interface of aqueous atmospheric aerosol. Experiments were performed on monolayers of oleic acid at the air-liquid interface at atmospherically relevant ozone concentrations to investigate if the viscosity of the sub-phase influences the rate of the reaction and to determine the effect of the presence of a second component within the monolayer, stearic acid, which is generally considered to be non-reactive towards ozone, on the reaction kinetics as determined by neutron reflectometry measurements. Atmospheric aerosol can be extremely viscous. The kinetics of the reaction were found to be independent of the viscosity of the sub-phase below the monolayer over a range of moderate viscosities, eta/eta water = 1.0-7.2, demonstrating no involvement of aqueous sub-phase oxidants in the rate determining step. The kinetics of oxidation of monolayers of pure oleic acid were found to depend on the surface coverage with different behaviour observed above and below a surface coverage of oleic acid of similar to 1 x 10(18) molecule m(-2). Atmospheric aerosol are typically complex mixtures, and the presence of an additional compound in the monolayer that is inert to direct ozone oxidation, stearic acid, did not significantly change the reaction kinetics. It is demonstrated that oleic acid monolayers at the air-water interface do not leave any detectable material at the air-water interface, contradicting the previous work published in this journal which the authors now believe to be erroneous. The combined results presented here indicate that the kinetics, and thus the atmospheric chemical lifetime for unsaturated surface active materials at the air-water interface to loss by reaction with gas-phase ozone, can be considered to be independent of other materials present at either the air-water interface or in the aqueous sub-phase.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
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- Av författaren/redakt...
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King, Martin D.
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Jones, Stephanie ...
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Lucas, Claire O. ...
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Thompson, Kather ...
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Rennie, A. R., 1 ...
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Ward, Andrew D.
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Marks, Amelia A.
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Fisher, Fleur N.
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Pfrang, Christia ...
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Hughes, Arwel, V
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Campbell, Richar ...
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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och Fysikalisk kemi
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- NATURVETENSKAP
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NATURVETENSKAP
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och Geovetenskap och ...
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och Meteorologi och ...
- Artiklar i publikationen
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Physical Chemist ...
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Uppsala universitet