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. Atmospheric aerosols influence the climate via clouddroplet nucleation and can facilitate the long-range transport of harmfulpollutants. The lifetime of such aerosols can therefore determine theirenvironmental impact. Fatty acids are found in organic aerosol emissionswith oleic acid, an unsaturated fatty acid, being a large contributor tocooking emissions. As a surfactant, oleic acid can self-organise intonanostructured lamellar bilayers with its sodium salt, and thisself-organisation can influence reaction kinetics. We developed a kineticmulti-layer model-based description of decay data we obtained fromlaboratory experiments of the ozonolysis of coated films of thisself-organised system, demonstrating a decreased diffusivity for both oleicacid and ozone due to lamellar bilayer formation. Diffusivity was furtherinhibited by a viscous oligomer product forming in the surface layers of thefilm. Our results indicate that nanostructure formation can increase the reactive half-life of oleic acid by an order of days at typical indoor andoutdoor atmospheric ozone concentrations. We are now able to placenanostructure formation in an atmospherically meaningful and quantifiablecontext. These results have implications for the transport of harmfulpollutants and the climate.

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