An adsorption theory of heterogeneous nucleation of water  vapour on nanoparticles

Laaksonen, A.; Malila, Jussi

doi:10.5194/acp-16-135-2016

Cited by 23 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been found that deposition ice nucleation and immersion freezing scale with seed particle surface area 18 19 20 , and accounting for the surface fractal geometry will allow more precise surface area estimation. Recent theoretical works suggest that deposition nucleation is caused by freezing of capillary condensed water in surface pores 21 , or by activation of ice clusters adsorbed on the surfaces of insoluble nuclei 22 . In either case, a measure such as the surface fractal dimension should be useful in the derivation of a quantifiable model.…”

Section: Discussionmentioning

confidence: 99%

Surface fractal dimension, water adsorption efficiency and cloud nucleation activity of insoluble aerosol

Laaksonen

Malila

Nenes

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Surface porosity affects the ability of a substance to adsorb gases. The surface fractal dimension D is a measure that indicates the amount that a surface fills a space, and can thereby be used to characterize the surface porosity. Here we propose a new method for determining D, based on measuring both the water vapour adsorption isotherm of a given substance, and its ability to act as a cloud condensation nucleus when introduced to humidified air in aerosol form. We show that our method agrees well with previous methods based on measurement of nitrogen adsorption. Besides proving the usefulness of the new method for general surface characterization of materials, our results show that the surface fractal dimension is an important determinant in cloud drop formation on water insoluble particles. We suggest that a closure can be obtained between experimental critical supersaturation for cloud drop activation and that calculated based on water adsorption data, if the latter is corrected using the surface fractal dimension of the insoluble cloud nucleus.

show abstract

Section: Discussionmentioning

confidence: 99%

Surface fractal dimension, water adsorption efficiency and cloud nucleation activity of insoluble aerosol

Laaksonen

Malila

Nenes

et al. 2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…There are currently no bulk‐surface partitioning models fully based on multilayer adsorption isotherms used in atmospheric aerosol models, although several approaches have been presented to quantify the adsorption of water on mainly insoluble particles using such isotherms (e.g., Henson, ; Laaksonen & Malila, ; Popovicheva et al, ; Sorjamaa & Laaksonen, ). The statistical mechanics model presented by Wexler and Dutcher () and Boyer et al () builds on multilayer adsorption concepts but, in practice, assumes single monolayer adsorption (Boyer et al, ): This model includes the amounts of different molecules in the surface and bulk as parameters and can therefore in principle provide information on surface partitioning, given that (experimental) surface tension and information on (droplet) system geometry are known.…”

Section: Introductionmentioning

confidence: 99%

A Monolayer Partitioning Scheme for Droplets of Surfactant Solutions

Malila

Prisle

2018

J Adv Model Earth Syst

Self Cite

120

View full text Add to dashboard Cite

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.

show abstract

“…Ice nucleation, in general, is one of the key microphysical processes in the atmosphere that remain ill understood. However, a novel theoretical approach (Laaksonen, 2015;Laaksonen and Malila, 2016) has been shown to be superior to older theories in the case of water nucleation on solid surfaces, and it may open a completely new avenue in the studies of atmospheric ice formation.…”

Section: Main Pollutantsmentioning

confidence: 99%

Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract. The northern Eurasian regions and Arctic Ocean will very likely undergo substantial changes during the next decades. The Arctic-boreal natural environments play a crucial role in the global climate via albedo change, carbon sources and sinks as well as atmospheric aerosol production from biogenic volatile organic compounds. Furthermore, it is expected that global trade activities, demographic movement, and use of natural resources will be increasing in the Arctic regions. There is a need for a novel research approach, which not only identifies and tackles the relevant multi-disciplinary research questions, but also is able to make a holistic system analysis of the expected feedbacks. In this paper, we introduce the research agenda of the Pan-Eurasian Experiment (PEEX), a multi-scale, multi-disciplinary and international program started in 2012 (https://www.atm.helsinki.fi/peex/). PEEX sets a research approach by which large-scale research topics are investigated from a system perspective and which aims to fill the key gaps in our understanding of the feedbacks and interactions between the land-atmosphereaquatic-society continuum in the northern Eurasian region. We introduce here the state of the art for the key topics in the PEEX research agenda and present the future prospects of the research, which we see relevant in this context.

show abstract

An adsorption theory of heterogeneous nucleation of water vapour on nanoparticles

Cited by 23 publications

References 25 publications

Surface fractal dimension, water adsorption efficiency and cloud nucleation activity of insoluble aerosol

Surface fractal dimension, water adsorption efficiency and cloud nucleation activity of insoluble aerosol

A Monolayer Partitioning Scheme for Droplets of Surfactant Solutions

Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region

Contact Info

Product

Resources

About