The impact of molecular self-organisation on the atmospheric fate of a cooking aerosol proxy

Adam Milsom, Adam M. Squires, Andrew D. Ward, Christian Pfrang

Research output: Contribution to journalArticlepeer-review

10 Citations (SciVal)


Atmospheric aerosols influence the climate via cloud droplet nucleation and can facilitate the long-range transport of harmful pollutants. The lifetime of such aerosols can therefore determine their environmental impact. Fatty acids are found in organic aerosol emissions with oleic acid, an unsaturated fatty acid, being a large contributor to cooking emissions. As a surfactant, oleic acid can self-organise into nanostructured lamellar bilayers with its sodium salt, and this self-organisation can influence reaction kinetics. We developed a kinetic multi-layer model-based description of decay data we obtained from laboratory experiments of the ozonolysis of coated films of this self-organised system, demonstrating a decreased diffusivity for both oleic acid and ozone due to lamellar bilayer formation. Diffusivity was further inhibited by a viscous oligomer product forming in the surface layers of the film. Our results indicate that nanostructure formation can increase the reactive half-life of oleic acid by an order of days at typical indoor and outdoor atmospheric ozone concentrations. We are now able to place nanostructure formation in an atmospherically meaningful and quantifiable context. These results have implications for the transport of harmful pollutants and the climate.

Original languageEnglish
Pages (from-to)4895-4907
Number of pages13
JournalAtmospheric Chemistry and Physics
Issue number7
Publication statusPublished - 12 Apr 2022

ASJC Scopus subject areas

  • Atmospheric Science


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