Photochemical and ozone-induced aging significantly alter the viscosity of aqueous trans-aconitic acid aerosol particles: Data of figures of preprint

While previous research has examined how photochemical aging and ozonolysis affect the physicochemical properties of organic aerosols, our study investigates the combined effect of photolysis and ozonolysis. We use aqueous trans-aconitic acid as a proxy for secondary organic aerosol (SOA), selected for its ability to absorb UV light and for containing a C=C double bond that is susceptible to ozonolysis.

We observe significant mass loss in single particles levitated in an electrodynamic balance when exposed to either O3 or UV light (375 nm), as well as to both aging processes simultaneously, resulting from fragmentation reactions followed by the volatilization of some of the products. Viscosity measurements at 17% relative humidity revealed an increase of nearly 4 orders of magnitude after both UV exposure and combined UV and O3 exposure at 60% mass loss.