Uptake of N2O5 by aqueous aerosol unveiled using chemically accurate many-body potentials

Vinícius Wilian D. Cruzeiro, Mirza Galib, David T. Limmer () and Andreas W. Götz ()
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Vinícius Wilian D. Cruzeiro: University of California San Diego
Mirza Galib: University of California
David T. Limmer: University of California
Andreas W. Götz: University of California San Diego

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The reactive uptake of N2O5 to aqueous aerosol is a major loss channel for nitrogen oxides in the troposphere. Despite its importance, a quantitative picture of the uptake mechanism is missing. Here we use molecular dynamics simulations with a data-driven many-body model of coupled-cluster accuracy to quantify thermodynamics and kinetics of solvation and adsorption of N2O5 in water. The free energy profile highlights that N2O5 is selectively adsorbed to the liquid–vapor interface and weakly solvated. Accommodation into bulk water occurs slowly, competing with evaporation upon adsorption from gas phase. Leveraging the quantitative accuracy of the model, we parameterize and solve a reaction–diffusion equation to determine hydrolysis rates consistent with experimental observations. We find a short reaction–diffusion length, indicating that the uptake is dominated by interfacial features. The parameters deduced here, including solubility, accommodation coefficient, and hydrolysis rate, afford a foundation for which to consider the reactive loss of N2O5 in more complex solutions.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28697-8

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DOI: 10.1038/s41467-022-28697-8

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