Coated soot particles with tunable, well-controlled properties generated in the laboratory with a miniCAST BC and a micro smog chamber

Loading...
Thumbnail Image
Authors
Ess, Michaela N.
Bertò, Michele
Gysel-Beer, Martin
Vasilatou, Konstantina
publication.page.legalentity.author
Date
28.05.2021
publication.page.studentsworktype
publication.page.studyprogram
publication.page.type
01A - Beitrag in wissenschaftlicher Zeitschrift
relationships.isEditorOf
publication.page.legalentity.editor
publication.page.contributor.mentor
publication.page.ispartof
Journal of Aerosol Science
publication.page.specialissue
DOI of the original publication
publication.page.description.uri
publication.page.relation.ispartofseries
Series number
publication.page.volume
157
publication.page.issue
publication.page.pagination
publication.page.identifier.patent
Publisher
Elsevier
publication.page.spatial
publication.page.edition
publication.page.version
publication.page.source
publication.page.assignee
publication.page.contributor.partner
publication.page.abstract
A Micro Smog Chamber (MSC) was coupled for the first time with a miniCAST 5201 Type BC combustion generator with the aim to produce a series of stable and reproducible model aerosols simulating the physical properties of combustion particles present in ambient air. With this setup it was possible to generate particles ranging from “fresh” soot (single scattering albedo SSA≤0.05, absorption Ångström exponent AAE close to 1, high EC/TC mass fraction (approximately 90%) and mobility diameter typically <100 nm) to “aged” soot with different amounts of organic coating. The “aged” soot particles could grow up to 200 nm and exhibited high SSA (up to 0.7 at λ = 870 nm), an increased AAE (up to 1.7) and low EC/TC mass fraction (down to <10%). The ageing was achieved by coating the soot particles with increasing amounts of secondary organic matter (SOM) formed by the photo-oxidation of α-pinene or mesitylene in the MSC. Thereby, the SSA and AAE increased with coating thickness, while the EC/TC mass fraction decreased. Over the experimental period of 2 h, the generation of the “aged” soot aerosols was stable with a standard deviation in particle size and number concentration of <1% and <6%, respectively. The day-to-day reproducibility was also satisfactory: with α-pinene as SOM precursor the variability (standard deviation) in particle size was <2% and in the AAE and SSA < 6%. Particle number concentrations up to 106 cm−3 and mass concentrations up to 15 mg/m3 (depending on particle size and SOM amount) could be generated, much higher than what has been reported with other oxidation flow reactors. The generated carbonaceous aerosols could find useful applications in the field of aerosol instrument calibration, particularly in the standardization of filter-based absorption photometers under controlled conditions.
publication.page.subject
Soot, Coating, Secondary organic matter, Micro smog chamber, Calibration aerosol
publication.page.subject.dcc
500 - Naturwissenschaften und Mathematik
publication.page.event
publication.page.coverage.startdate
publication.page.coverage.enddate
publication.page.event.start
publication.page.event.end
publication.page.date.valid
publication.page.identifier.isbn
publication.page.identifier.issn
0021-8502
1879-1964
publication.page.language.iso
en
publication.page.inventedhere
Yes
publication.page.publication.state
publication.page.publication.state.Published
publication.page.reviewtype
Anonymous ex ante peer review of a complete publication
publication.page.openaccesscategory
Hybrid
publication.page.rights.uri
'https://creativecommons.org/licenses/by-nc-nd/4.0/'
Citation
ESS, Michaela N., Michele BERTÒ, Alejandro KELLER, Martin GYSEL-BEER und Konstantina VASILATOU, 2021. Coated soot particles with tunable, well-controlled properties generated in the laboratory with a miniCAST BC and a micro smog chamber. Journal of Aerosol Science. 28 Mai 2021. Bd. 157. DOI 10.1016/j.jaerosci.2021.105820. Verfügbar unter: https://doi.org/10.26041/fhnw-4600

Version History

Now showing 1 - 2 of 2
VersionDateSummary
2*
2023-02-06 14:48:10
Lizenz
2023-02-03 07:00:32
* Selected version