Modeling Size-Dependent Kinetics in Multiphase Aerosol Chemistry
By
V. Faye McNeill
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Summary
This article examines the modeling and parametrization of size-dependent processes in multiphase aerosol chemistry. It focuses on gas-droplet reactions that impact stratospheric and tropospheric chemistry, secondary aerosol formation, aerosol-climate interactions, and human health. The content details the complex multiphase processes involving coupled mass transfer and reaction steps such as partitioning, adsorption/desorption, solvation, diffusion, and chemical reactions at interfaces and in bulk liquid. It highlights that laboratory studies show size-dependent kinetics where apparent reaction rates increase with decreasing droplet size.
Key quotes
· 3 pulledMultiphase chemical processes (i.e., gas–droplet reactions) impact stratospheric and tropospheric chemistry, secondary inorganic and organic aerosol formation, aerosol–climate interactions, and human health.
Typically, multiphase processes are complex and involve several coupled mass transfer and reaction steps, including the partitioning of the gas-phase reactant into the condensed phase, adsorption and desorption, solvation and desolvation, diffusion of gas and liquid phase species, and chemical reactions at the interface and in the bulk liquid.
Many atmospherically relevant multiphase reactive systems exhibit size-dependent kinetics in laboratory studies, with apparent reaction rates increasing with decreasing droplet size.
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