Oxidation of oleic acid at the air-water interface and its potential effects on cloud critical supersaturations

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Oxidation of oleic acid at the air-water interface and its potential effects on cloud critical supersaturations. / King, M.D.; Rennie, A.R.; Thompson, K.C.; Fisher, F.N.; Dong, C.C.; Thomas, R.K.; Pfrang, C.; Hughes, A.V.

In: Physical Chemistry Chemical Physics, Vol. 11, No. 35, 21.09.2009, p. 7699-7707 .

Research output: Contribution to journalArticle

Harvard

King, MD, Rennie, AR, Thompson, KC, Fisher, FN, Dong, CC, Thomas, RK, Pfrang, C & Hughes, AV 2009, 'Oxidation of oleic acid at the air-water interface and its potential effects on cloud critical supersaturations', Physical Chemistry Chemical Physics, vol. 11, no. 35, pp. 7699-7707 . https://doi.org/10.1039/b906517b

APA

King, M. D., Rennie, A. R., Thompson, K. C., Fisher, F. N., Dong, C. C., Thomas, R. K., Pfrang, C., & Hughes, A. V. (2009). Oxidation of oleic acid at the air-water interface and its potential effects on cloud critical supersaturations. Physical Chemistry Chemical Physics, 11(35), 7699-7707 . https://doi.org/10.1039/b906517b

Vancouver

Author

King, M.D. ; Rennie, A.R. ; Thompson, K.C. ; Fisher, F.N. ; Dong, C.C. ; Thomas, R.K. ; Pfrang, C. ; Hughes, A.V. / Oxidation of oleic acid at the air-water interface and its potential effects on cloud critical supersaturations. In: Physical Chemistry Chemical Physics. 2009 ; Vol. 11, No. 35. pp. 7699-7707 .

Bibtex

@article{2a320d78788b47268e2b3c9d303f33f1,
title = "Oxidation of oleic acid at the air-water interface and its potential effects on cloud critical supersaturations",
abstract = "The oxidation of organic films on cloud condensation nuclei has the potential to affect climate and precipitation events. In this work we present a study of the oxidation of a monolayer of deuterated oleic acid (cis-9-octadecenoic acid) at the air–water interface by ozone to determine if oxidation removes the organic film or replaces it with a product film. A range of different aqueous sub-phases were studied. The surface excess of deuterated material was followed by neutron reflection whilst the surface pressure was followed using a Wilhelmy plate. The neutron reflection data reveal that approximately half the organic material remains at the air–water interface following the oxidation of oleic acid by ozone, thus cleavage of the double bond by ozone creates one surface active species and one species that partitions to the bulk (or gas) phase. The most probable products, produced with a yield of ∼(87 ± 14)%, are nonanoic acid, which remains at the interface, and azelaic acid (nonanedioic acid), which dissolves into the bulk solution. We also report a surface bimolecular rate constant for the reaction between ozone and oleic acid of (7.3 ± 0.9) × 10−11 cm2 molecule s−1. The rate constant and product yield are not affected by the solution sub-phase. An uptake coefficient of ozone on the oleic acid monolayer of ∼4 × 10−6 is estimated from our results. A simple K{\"o}hler analysis demonstrates that the oxidation of oleic acid by ozone on an atmospheric aerosol will lower the critical supersaturation needed for cloud droplet formation. We calculate an atmospheric chemical lifetime of oleic acid of 1.3 hours, significantly longer than laboratory studies on pure oleic acid particles suggest, but more consistent with field studies reporting oleic acid present in aged atmospheric aerosol.",
author = "M.D. King and A.R. Rennie and K.C. Thompson and F.N. Fisher and C.C. Dong and R.K. Thomas and C. Pfrang and A.V. Hughes",
year = "2009",
month = sep,
day = "21",
doi = "10.1039/b906517b",
language = "English",
volume = "11",
pages = "7699--7707 ",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "Royal Society of Chemistry",
number = "35",

}

RIS

TY - JOUR

T1 - Oxidation of oleic acid at the air-water interface and its potential effects on cloud critical supersaturations

AU - King, M.D.

AU - Rennie, A.R.

AU - Thompson, K.C.

AU - Fisher, F.N.

AU - Dong, C.C.

AU - Thomas, R.K.

AU - Pfrang, C.

AU - Hughes, A.V.

PY - 2009/9/21

Y1 - 2009/9/21

N2 - The oxidation of organic films on cloud condensation nuclei has the potential to affect climate and precipitation events. In this work we present a study of the oxidation of a monolayer of deuterated oleic acid (cis-9-octadecenoic acid) at the air–water interface by ozone to determine if oxidation removes the organic film or replaces it with a product film. A range of different aqueous sub-phases were studied. The surface excess of deuterated material was followed by neutron reflection whilst the surface pressure was followed using a Wilhelmy plate. The neutron reflection data reveal that approximately half the organic material remains at the air–water interface following the oxidation of oleic acid by ozone, thus cleavage of the double bond by ozone creates one surface active species and one species that partitions to the bulk (or gas) phase. The most probable products, produced with a yield of ∼(87 ± 14)%, are nonanoic acid, which remains at the interface, and azelaic acid (nonanedioic acid), which dissolves into the bulk solution. We also report a surface bimolecular rate constant for the reaction between ozone and oleic acid of (7.3 ± 0.9) × 10−11 cm2 molecule s−1. The rate constant and product yield are not affected by the solution sub-phase. An uptake coefficient of ozone on the oleic acid monolayer of ∼4 × 10−6 is estimated from our results. A simple Köhler analysis demonstrates that the oxidation of oleic acid by ozone on an atmospheric aerosol will lower the critical supersaturation needed for cloud droplet formation. We calculate an atmospheric chemical lifetime of oleic acid of 1.3 hours, significantly longer than laboratory studies on pure oleic acid particles suggest, but more consistent with field studies reporting oleic acid present in aged atmospheric aerosol.

AB - The oxidation of organic films on cloud condensation nuclei has the potential to affect climate and precipitation events. In this work we present a study of the oxidation of a monolayer of deuterated oleic acid (cis-9-octadecenoic acid) at the air–water interface by ozone to determine if oxidation removes the organic film or replaces it with a product film. A range of different aqueous sub-phases were studied. The surface excess of deuterated material was followed by neutron reflection whilst the surface pressure was followed using a Wilhelmy plate. The neutron reflection data reveal that approximately half the organic material remains at the air–water interface following the oxidation of oleic acid by ozone, thus cleavage of the double bond by ozone creates one surface active species and one species that partitions to the bulk (or gas) phase. The most probable products, produced with a yield of ∼(87 ± 14)%, are nonanoic acid, which remains at the interface, and azelaic acid (nonanedioic acid), which dissolves into the bulk solution. We also report a surface bimolecular rate constant for the reaction between ozone and oleic acid of (7.3 ± 0.9) × 10−11 cm2 molecule s−1. The rate constant and product yield are not affected by the solution sub-phase. An uptake coefficient of ozone on the oleic acid monolayer of ∼4 × 10−6 is estimated from our results. A simple Köhler analysis demonstrates that the oxidation of oleic acid by ozone on an atmospheric aerosol will lower the critical supersaturation needed for cloud droplet formation. We calculate an atmospheric chemical lifetime of oleic acid of 1.3 hours, significantly longer than laboratory studies on pure oleic acid particles suggest, but more consistent with field studies reporting oleic acid present in aged atmospheric aerosol.

UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-69649103501&partnerID=MN8TOARS

U2 - 10.1039/b906517b

DO - 10.1039/b906517b

M3 - Article

VL - 11

SP - 7699

EP - 7707

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 35

ER -