Products and mechanisms of ozone reactions with oleic acid for aerosol particles having core-shell morphologies. Katrib, Y.; Martin, S., T.; Hung, H., M.; Rudich, Y.; Zhang, H., Z.; Slowik, J., G.; Davidovits, P.; Jayne, J., T.; and Worsnop, D., R. Journal of Physical Chemistry A, 108(32):6686-6695, 2004.
Website abstract bibtex Heterogeneous reactions of oleic acid aerosol particles with ozone are studied below 1% relative humidity. The particles have inert polystyrene latex cores (101-nm diameter) coated by oleic acid layers of 2 to 30 nm. The chemical content of the organic layer is monitored with increasing ozone exposure by using an aerosol mass spectrometer. The carbon-normalized percent yields of particle-phase reaction products are 20-35% 9-oxononanoic acid, 1-3% azelaic acid, 1-3% nonanoic acid, and 35-50% other organic molecules (designated as CHOT). There is approximately 25% evaporation, presumably as 1-nonanal. To explain the formation of CHOT molecules and the low yields of azelaic and nonanoic acids, we suggest a chemical mechanism in which the Criegee biradical precursors to azelaic acid and nonanoic acid are scavenged by oleic acid to form CHOT molecules. These chemical reactions increase the carbon-normalized oxygen content (z/x) of the CxHyOz layer from 0.1 for unreacted oleic acid to 0.25 after high ozone exposure. Under the assumption that oxygen content is a predictor of hygroscopicity, our results suggest an increased cloud condensation nuclei activity of atmospherically aged organic particles that initially have alkene functionalities.
@article{
title = {Products and mechanisms of ozone reactions with oleic acid for aerosol particles having core-shell morphologies},
type = {article},
year = {2004},
keywords = {atmospheric particles,chemistry,heterogeneous reaction,identification,kinetics,mass-spectrometry,organic aerosols,phase reactions,surface,unsaturated fatty-acids},
pages = {6686-6695},
volume = {108},
websites = {<Go to ISI>://000223182700011},
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last_modified = {2015-05-08T12:57:18.000Z},
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notes = {Times Cited: 57<br/>Article<br/>English<br/>Cited References Count: 53<br/>844th},
abstract = {Heterogeneous reactions of oleic acid aerosol particles with ozone are studied below 1% relative humidity. The particles have inert polystyrene latex cores (101-nm diameter) coated by oleic acid layers of 2 to 30 nm. The chemical content of the organic layer is monitored with increasing ozone exposure by using an aerosol mass spectrometer. The carbon-normalized percent yields of particle-phase reaction products are 20-35% 9-oxononanoic acid, 1-3% azelaic acid, 1-3% nonanoic acid, and 35-50% other organic molecules (designated as CHOT). There is approximately 25% evaporation, presumably as 1-nonanal. To explain the formation of CHOT molecules and the low yields of azelaic and nonanoic acids, we suggest a chemical mechanism in which the Criegee biradical precursors to azelaic acid and nonanoic acid are scavenged by oleic acid to form CHOT molecules. These chemical reactions increase the carbon-normalized oxygen content (z/x) of the CxHyOz layer from 0.1 for unreacted oleic acid to 0.25 after high ozone exposure. Under the assumption that oxygen content is a predictor of hygroscopicity, our results suggest an increased cloud condensation nuclei activity of atmospherically aged organic particles that initially have alkene functionalities.},
bibtype = {article},
author = {Katrib, Y and Martin, S T and Hung, H M and Rudich, Y and Zhang, H Z and Slowik, J G and Davidovits, P and Jayne, J T and Worsnop, D R},
journal = {Journal of Physical Chemistry A},
number = {32}
}