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dc.contributor.author
Stewart, David J.
dc.contributor.author
Cai, Chen
dc.contributor.author
Nayler, J.
dc.contributor.author
Preston, Thomas C.
dc.contributor.author
Reid, Jonathan P.
dc.contributor.author
Krieger, Ulrich
dc.contributor.author
Marcolli, Claudia
dc.contributor.author
Zhang, Yunhong
dc.date.accessioned
2020-05-08T14:23:16Z
dc.date.available
2017-06-11T17:24:41Z
dc.date.available
2020-05-08T14:19:16Z
dc.date.available
2020-05-08T14:23:16Z
dc.date.issued
2015-05-07
dc.identifier.issn
1089-5639
dc.identifier.issn
1520-5215
dc.identifier.other
10.1021/acs.jpca.5b01658
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/100841
dc.identifier.doi
10.3929/ethz-b-000100841
dc.description.abstract
Direct measurements of the phase separation relative humidity (RH) and morphology of aerosol particles consisting of liquid organic and aqueous inorganic domains are presented. Single droplets of mixed phase composition are captured in a gradient force optical trap, and the evolving size, refractive index (RI), and morphology are characterized by cavity-enhanced Raman spectroscopy. Starting at a RH above the phase separation RH, the trapped particle is dried to lower RH and the transition to a phase-separated structure is inferred from distinct changes in the spectroscopic fingerprint. In particular, the phase separation RHs of droplets composed of aqueous solutions of polyethylene glycol (PEG-400)/ammonium sulfate and a mixture of C6-diacids/ammonium sulfate are probed, inferring the RH from the RI of the droplet immediately prior to phase separation. The observed phase separation RHs occur at RH marginally higher (at most 4%) than reported in previous measurements made from studies of particles deposited on hydrophobic surfaces by brightfield imaging. Clear evidence for the formation of phase-separated droplets of core–shell morphology is observed, although partially engulfed structures can also be inferred to form. Transitions between the different spectroscopic signatures of phase separation suggest that fluctuations in morphology can occur. For droplets that are repeatedly cycled through the phase separation RH, the water activity at phase separation is found to be remarkably reproducible (within ±0.0013) and is the same for the 1-phase to 2-phase transition and the 2-phase to 1-phase transition. By contrast, larger variation between the water activities at phase separation is observed for different droplets (typically ±0.02).
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Liquid-liquid phase separation in mixed organic/inorganic single aqueous aerosol droplets
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
The Journal of Physical Chemistry A
ethz.journal.volume
119
en_US
ethz.journal.issue
18
en_US
ethz.journal.abbreviated
J. phys. chem., A
ethz.pages.start
4177
en_US
ethz.pages.end
4190
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
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
2017-06-11T17:25:13Z
ethz.source
ECIT
ethz.identifier.importid
imp5936532bac1e778316
ethz.ecitpid
pub:158350
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T09:46:51Z
ethz.rosetta.lastUpdated
2021-02-15T10:56:11Z
ethz.rosetta.versionExported
true
ethz.COinS
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