Production of neutral molecular clusters by controlled neutralization of mobility standards

Show simple item record Steiner, G. Franchin, A. Kangasluoma, J. Kerminen, V. -M. Kulmala, M. Petäjä, T. 2017-08-31T14:18:00Z 2017-08-31T14:18:00Z 2017
dc.identifier.citation Steiner , G , Franchin , A , Kangasluoma , J , Kerminen , V -M , Kulmala , M & Petäjä , T 2017 , ' Production of neutral molecular clusters by controlled neutralization of mobility standards ' , Aerosol Science and Technology , vol. 51 , no. 8 , pp. 946-955 .
dc.identifier.other PURE: 89037682
dc.identifier.other PURE UUID: 0b3763d1-0854-487a-8029-6b23b04fdd33
dc.identifier.other WOS: 000407154400004
dc.identifier.other Scopus: 85019273618
dc.identifier.other ORCID: /0000-0002-1639-1187/work/39204706
dc.identifier.other ORCID: /0000-0002-1881-9044/work/102822569
dc.description.abstract Measuring aerosols and molecular clusters below the 3 nm size limit is essential to increase our understanding of new particle formation. Instruments for the detection of sub-3 nm aerosols and clusters exist and need to be carefully calibrated and characterized. So far calibrations and laboratory tests have been carried out using mainly electrically charged aerosols, as they are easier to handle experimentally. However, the charging state of the cluster is an important variable to take into account. Furthermore, instrument characterization performed with charged aerosols could be biased, preventing a correct interpretation of data when electrically neutral sub-3 nm aerosols are involved. This article presents the first steps to generate electrically neutral molecular clusters as standards for calibration. We show two methods: One based on the neutralization of well-known molecular clusters (mobility standards) by ions generated in a switchable aerosol neutralizer. The second is based on the controlled neutralization of mobility standards with mobility standards of opposite polarity in a recombination cell. We highlight the challenges of these two techniques and, where possible, point out solutions. In addition, we give an outlook on the next steps toward generating well-defined neutral molecular clusters with a known chemical composition and concentration. en
dc.format.extent 10
dc.language.iso eng
dc.relation.ispartof Aerosol Science and Technology
dc.rights unspecified
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject PARTICLE-SIZE
dc.subject RESOLUTION
dc.subject ANALYZER
dc.subject RANGE
dc.subject 114 Physical sciences
dc.title Production of neutral molecular clusters by controlled neutralization of mobility standards en
dc.type Article
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0278-6826
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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