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dc.contributor.author
Renbaum-Wolff, Lindsay
dc.contributor.author
Song, Mijung
dc.contributor.author
Marcolli, Claudia
dc.contributor.author
Zhang, Yue
dc.contributor.author
Liu, Pengfei F.
dc.contributor.author
Grayson, James W.
dc.contributor.author
Geiger, Franz M.
dc.contributor.author
Martin, Scot T.
dc.contributor.author
Bertram, Allan K.
dc.date.accessioned
2018-10-08T13:24:44Z
dc.date.available
2017-06-12T08:37:29Z
dc.date.available
2018-10-08T13:24:44Z
dc.date.issued
2016
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-16-7969-2016
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/118090
dc.identifier.doi
10.3929/ethz-b-000118090
dc.description.abstract
Particles consisting of secondary organic material (SOM) are abundant in the atmosphere. To predict the role of these particles in climate, visibility and atmospheric chemistry, information on particle phase state (i.e., single liquid, two liquids and solid) is needed. This paper focuses on the phase state of SOM particles free of inorganic salts produced by the ozonolysis of α-pinene. Phase transitions were investigated in the laboratory using optical microscopy and theoretically using a thermodynamic model at 290K and for relative humidities ranging from  < 0.5 to 100%. In the laboratory studies, a single phase was observed from 0 to 95% relative humidity (RH) while two liquid phases were observed above 95% RH. For increasing RH, the mechanism of liquid–liquid phase separation (LLPS) was spinodal decomposition. The RH range over which two liquid phases were observed did not depend on the direction of RH change. In the modeling studies, the SOM took up very little water and was a single organic-rich phase at low RH values. At high RH, the SOM underwent LLPS to form an organic-rich phase and a water-rich phase, consistent with the laboratory studies. The presence of LLPS at high RH values can have consequences for the cloud condensation nuclei (CCN) activity of SOM particles. In the simulated Köhler curves for SOM particles, two local maxima were observed. Depending on the composition of the SOM, the first or second maximum can determine the critical supersaturation for activation. Recently researchers have observed inconsistencies between measured CCN properties of SOM particles and hygroscopic growth measured below water saturation (i.e., hygroscopic parameters measured below water saturation were inconsistent with hygroscopic parameters measured above water saturation). The work presented here illustrates that such inconsistencies are expected for systems with LLPS when the water uptake at subsaturated conditions represents the hygroscopicity of an organic-rich phase while the barrier for CCN activation can be determined by the second maximum in the Köhler curve when the particles are water rich.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Observations and implications of liquid-liquid phase separation at high relative humidities in secondary organic material produced by α-pinene ozonolysis without inorganic salts
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2016-07-01
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
16
en_US
ethz.journal.issue
12
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
7969
en_US
ethz.pages.end
7979
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
004294181
ethz.publication.place
Göttingen
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
en_US
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
2017-06-12T08:39:16Z
ethz.source
ECIT
ethz.identifier.importid
imp593654860e31895542
ethz.ecitpid
pub:180031
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-26T03:56:12Z
ethz.rosetta.lastUpdated
2018-10-08T13:24:51Z
ethz.rosetta.versionExported
true
ethz.COinS
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