University of Oulu

Malila, J., & Prisle, N. L. (2018). A monolayer partitioning scheme for droplets of surfactant solutions. Journal of Advances in Modeling Earth Systems, 10, 3233–3251.

A monolayer partitioning scheme for droplets of surfactant solutions

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Author: Malila, Jussi1; Prisle, Nønne1
Organizations: 1Nano and Molecular Systems Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
Persistent link:
Language: English
Published: John Wiley & Sons, 2018
Publish Date: 2019-02-22


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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Series: Journal of advances in modeling earth systems
ISSN: 1942-2466
ISSN-E: 1942-2466
ISSN-L: 1942-2466
Volume: 10
Issue: 12
Pages: 3233 - 3251
DOI: 10.1029/2018MS001456
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
115 Astronomy and space science
1172 Environmental sciences
Funding: This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme, Project SURFACE (grant agreement 717022). The authors also gratefully acknowledge the financial contribution from the Academy of Finland (grants 308238 and 314175). We thank Jack Lin for his assistance on language and layout. Data needed to reproduce calculations given in this article can be found from the supporting information S1.
EU Grant Number: (717022) SURFACE - The unexplored world of aerosol surfaces and their impacts.
Academy of Finland Grant Number: 308238
Detailed Information: 308238 (Academy of Finland Funding decision)
314175 (Academy of Finland Funding decision)
Copyright information: ©2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.