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dc.contributor.author
Bastelberger, Sandra
dc.contributor.author
Krieger, Ulrich
dc.contributor.author
Luo, Beiping P.
dc.contributor.author
Peter, Thomas
dc.date.accessioned
2019-01-10T12:01:33Z
dc.date.available
2019-01-10T03:27:32Z
dc.date.available
2019-01-10T12:01:33Z
dc.date.issued
2018-12-28
dc.identifier.issn
0021-9606
dc.identifier.issn
1089-7690
dc.identifier.other
10.1063/1.5052216
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/314681
dc.identifier.doi
10.3929/ethz-b-000314681
dc.description.abstract
Field and laboratory measurements indicate that atmospheric organic aerosol particles can be present in a highly viscous state. In contrast to liquid state particles, the gas phase equilibration to ambient relative humidity (RH) can be kinetically limited and governed by condensed phase diffusion. In water diffusion experiments on highly viscous single aerosol particles levitated in an electrodynamic balance, we observed a characteristic shift behavior of the Mie scattering resonances indicative of the changing radial structure of the particle, thus providing an experimental method to track the diffusion process inside the particle. Due to the plasticizing effect of water, theory predicts extremely steep, front-like water concentration gradients inside highly viscous particles exposed to a rapid increase in RH. The resulting quasi step-like concentration profile motivates the use of a simple core-shell model describing the morphology of the non-equilibrium particle during humidification. The particle growth and reduction of the shell refractive index can be observed experimentally as redshift and blueshift behavior of the Mie resonances, respectively. We can deduce the particle radius as well as a core-shell radius ratio from the measured shift pattern and Mie scattering calculations. Using both the growth information obtained from the Mie resonance redshift and thermodynamic equilibrium data, we can infer a comprehensive picture of the time evolution of the diffusion fronts in the framework of our core-shell model. The observed shift behavior of the Mie resonances provides direct evidence of very steep diffusion fronts caused by the plasticizing effect of water and a method to validate previous diffusivity measurements.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Institute of Physics
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Time evolution of steep diffusion fronts in highly viscous aerosol particles measured with Mie resonance spectroscopy
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2018-12-27
ethz.journal.title
The Journal of Chemical Physics
ethz.journal.volume
149
en_US
ethz.journal.issue
24
en_US
ethz.journal.abbreviated
J. Chem. Phys.
ethz.pages.start
244506
en_US
ethz.size
11 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Melville, NY
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03517 - Peter, Thomas / Peter, Thomas
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03517 - Peter, Thomas / Peter, Thomas
ethz.date.deposited
2019-01-10T03:27:38Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-01-10T12:01:56Z
ethz.rosetta.lastUpdated
2022-03-28T22:02:51Z
ethz.rosetta.versionExported
true
ethz.COinS
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