Hygroscopicity of aerosol particles at low temperatures. 2. Theoretical and experimental hygroscopic properties of laboratory generated aerosols

dc.contributor.authorGysel, Martin
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorBaltensperger, Urs
dc.date.accessioned2024-08-19T14:07:58Z
dc.date.available2024-08-19T14:07:58Z
dc.date.issued2001-11-21
dc.description.abstractA Hygroscopicity Tandem Differential Mobility Analyzer (H-TDMA) system has been used to measure hygroscopic growth curves and deliquescence relative humidities (DRH) of laboratory generated (NH4)2SO4, NaCl, and NaNO3 particles at temperatures T = 20 °C and −10 °C. Good agreement (better than 3.5%) between measured growth curves and Köhler theory was found using empirical temperature and concentration dependent values for water activity, solution density, and surface tension. The measured growth curves only experience a small temperature dependence in the observed temperature range. Therefore, to a first approximation, it is possible to neglect the temperature dependence of the water activity for theoretical calculations in the temperature range −10 °C < T < 25 °C. The small differences between experiment and theory, which were predominantly observed for NaCl particles, are probably caused by a small amount of water adsorbed on the “dry” crystals. It was also observed that these particles experience a significant restructuring at relative humidity RH < DRH, which was also taken into account for a comparison with theoretical curves. If salt particles are used for instrument calibration, precautions regarding the dry particle diameter have to be taken.
dc.identifier.doi10.1021/es010055g
dc.identifier.issn0013-936X
dc.identifier.issn1520-5851
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46830
dc.issue1
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.relation.ispartofEnvironmental Science & Technology
dc.spatialWashington, D.C.
dc.subject.ddc550 - Geowissenschaften
dc.subject.ddc530 - Physik
dc.titleHygroscopicity of aerosol particles at low temperatures. 2. Theoretical and experimental hygroscopic properties of laboratory generated aerosols
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume36
dspace.entity.typePublication
fhnw.InventedHereNo
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.affiliation.hochschuleHochschule für Technikde_CH
fhnw.affiliation.institutlnstitut für Sensorik und Elektronikde_CH
fhnw.openAccessCategoryClosed
fhnw.pagination63-68
fhnw.publicationStatePublished
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery05dd9a19-7a24-4325-805a-2d121483b168
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