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Item Metadata Title Reactive uptake kinetics of NO3 on multicomponent and multiphase organic mixtures containing unsaturated and saturated organics. Creator Publisher Royal Society of Chemistry Date Issued 2011-02-03 Description We investigated the reactive uptake of NO3 (an important night-time oxidant in the atmosphere) on binary mixtures containing an unsaturated organic (methyl oleate) and saturated molecules (diethyl sebacate, dioctyl sebacate, and squalane) which we call matrix molecules. These studies were carried out to better understand the reactivity of unsaturated organics in multicomponent and multiphase atmospheric particles. For liquid binary mixtures the reactivity of methyl oleate depended on the matrix molecule. Assuming a bulk reaction, varied by a factor of 2.7, and assuming a surface reaction HSmatrixKSmatrixkSoleate varied by a factor of 3.6, where and HSmatrixKSmatrixkSoleate are constants extracted from the data using the resistor model. For solid–liquid mixtures, the reactive uptake coefficient depended on exposure time: the uptake decreased by a factor of 10 after exposure to NO3 for approximately 90 min.

By assuming either a bulk or surface reaction, the atmospheric lifetime of methyl oleate in different matrices was estimated for moderately polluted atmospheric conditions. For all liquid mixtures, the lifetime was in the order of a few minutes (with an upper limit of 35 min).

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These lifetimes can be used as lower limits to the lifetimes in semi-solid mixtures. Our studies emphasize that the lifetime of unsaturated organics (similar to methyl oleate) is likely short if the particle matrix is in a liquid state.

Genre Type Language eng Date Available 2012-02-03 Provider Vancouver: University of British Columbia Library Rights Attribution-NonCommercial-NoDerivatives 4.0 International DOI 10.14288/1.0041867 URI Affiliation Citation Xiao, Song, Bertram, Allan K. Reactive uptake kinetics of NO3 on multicomponent and multiphase organic mixtures containing unsaturated and saturated organics. Physical Chemistry Chemical Physics 13(14) 6628-663 Publisher DOI 10.1039/C0CP02682D Peer Review Status Reviewed Scholarly Level Faculty Copyright Holder Bertram, Allen K. Rights URI AggregatedSourceRepository DSpace Download Media [ 923.37kB ] Metadata JSON: JSON-LD: RDF/XML (Pretty): RDF/JSON: Turtle: N-Triples: Original Record: Full Text Citation Full Text. Phys., 2011, 13, 6628–6636 This journal is c the Owner Societies 2011 Cite this: Phys. Phys., 2011, 13, 6628–6636 Reactive uptake kinetics of NO3 on multicomponent and multiphase organic mixtures containing unsaturated and saturated organics S. Bertram* Received 27th November 2010, Accepted 3rd February 2011 DOI: 10.1039/c0cp02682d We investigated the reactive uptake of NO3 (an important night-time oxidant in the atmosphere) on binary mixtures containing an unsaturated organic (methyl oleate) and saturated molecules (diethyl sebacate, dioctyl sebacate, and squalane) which we call matrix molecules.

These studies were carried out to better understand the reactivity of unsaturated organics in multicomponent and multiphase atmospheric particles. For liquid binary mixtures the reactivity of methyl oleate depended on the matrix molecule. Assuming a bulk reaction, Hmatrix ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi Dmatrixkoleate p varied by a factor of 2.7, and assuming a surface reaction HSmatrixK S matrixk S oleate varied by a factor of 3.6, where Hmatrix ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi Dmatrixkoleate p and HSmatrixK S matrixk S oleate are constants extracted from the data using the resistor model. For solid–liquid mixtures, the reactive uptake coefficient depended on exposure time: the uptake decreased by a factor of 10 after exposure to NO3 for approximately 90 min. By assuming either a bulk or surface reaction, the atmospheric lifetime of methyl oleate in different matrices was estimated for moderately polluted atmospheric conditions. For all liquid mixtures, the lifetime was in the order of a few minutes (with an upper limit of 35 min).

These lifetimes can be used as lower limits to the lifetimes in semi-solid mixtures. Our studies emphasize that the lifetime of unsaturated organics (similar to methyl oleate) is likely short if the particle matrix is in a liquid state.