Production of neutral molecular clusters by controlled neutralization of mobility standards

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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 . https://doi.org/10.1080/02786826.2017.1328103

Title: Production of neutral molecular clusters by controlled neutralization of mobility standards
Author: Steiner, G.; Franchin, A.; Kangasluoma, J.; Kerminen, V. -M.; Kulmala, M.; Petäjä, T.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017
Language: eng
Number of pages: 10
Belongs to series: Aerosol Science and Technology
ISSN: 0278-6826
URI: http://hdl.handle.net/10138/217915
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.
Subject: IONIC-LIQUID NANODROPS
HETEROGENEOUS NUCLEATION
ELECTRICAL MOBILITIES
AEROSOL NUCLEATION
PARTICLE-SIZE
RESOLUTION
ELECTROSPRAYS
NANOPARTICLES
ANALYZER
RANGE
114 Physical sciences
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