Accelerated Sulfur Oxidation by Ozone on Surfaces of Single Optically Trapped Aerosol Particles

The sulfur oxidation in mixed sodium thiosulfate/sucrose/aqueous microdroplets by gaseous ozone is studied this work via aerosol optical tweezers coupled with Raman spectroscopy, which can simultaneously determine various physicochemical properties and the heterogeneous reaction kinetics of single optically trapped microdroplets, allowing for elucidating their complicated interplay. According to measurement results at different relative humidities, concentrations, stoichiometries inorganic organic solutes, finds that a high ionic strength accelerate thiosulfate air–water interfaces, while viscosity prolongs time scales due diffusion-limited kinetics. kinetic multilayer model surface bulk chemistry (KM-SUB) utilized investigate observed retrieve rate coefficients. KM-SUB fit indicate binary aqueous strengths dominated interfacial reactions, fitted coefficients increase 1 order magnitude when droplet increases around 40 M. This further utilizes measurements dependence discuss coupling among gas-interface-bulk partitioning model. Finally, also exploits containing ternary sucrose mixtures, demonstrating feasibility pinning down viscosities