期刊
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
卷 10, 期 12, 页码 3233-3251出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018MS001456
关键词
aerosols; cloud condensation nuclei; partitioning; surfactants
资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme, Project SURFACE [717022]
- Academy of Finland [308238, 314175]
- Academy of Finland (AKA) [308238, 314175, 308238, 314175] Funding Source: Academy of Finland (AKA)
Bulk-surface partitioning of surface active species affects both cloud droplet activation by aerosol particles and heterogeneous atmospheric chemistry. Various approaches are given in the literature to capture this effect in atmospheric models. Here we present a simple, yet physically self-contained, monolayer model for prediction of both composition and thickness of the surface layer of an aqueous droplet. The monolayer surface model is based on assuming a finite surface layer and mass balance of all species within the droplet. Model predictions are presented for binary and ternary aqueous surfactant model systems and compared to both experimental and model data from the literature and predictions using a common Gibbsian model approach. Deviations from Gibbsian surface thermodynamics due to volume constraints imposed by the finite monolayer lead to stronger predicted surface tension reduction at smaller droplet sizes with the monolayer model. Process dynamics of the presented monolayer model are also contrasted to other recently proposed approaches to treating surface partitioning in droplets, with different underlying assumptions.
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