Hygroscopicity of aerosol particles at low temperatures. 2. Theoretical and experimental hygroscopic properties of laboratory generated aerosols
dc.contributor.author | Gysel, Martin | |
dc.contributor.author | Weingartner, Ernest | |
dc.contributor.author | Baltensperger, Urs | |
dc.date.accessioned | 2024-08-19T14:07:58Z | |
dc.date.available | 2024-08-19T14:07:58Z | |
dc.date.issued | 2001-11-21 | |
dc.description.abstract | A 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.doi | 10.1021/es010055g | |
dc.identifier.issn | 0013-936X | |
dc.identifier.issn | 1520-5851 | |
dc.identifier.uri | https://irf.fhnw.ch/handle/11654/46830 | |
dc.issue | 1 | |
dc.language.iso | en | |
dc.publisher | American Chemical Society | |
dc.relation.ispartof | Environmental Science & Technology | |
dc.spatial | Washington, D.C. | |
dc.subject.ddc | 550 - Geowissenschaften | |
dc.subject.ddc | 530 - Physik | |
dc.title | Hygroscopicity of aerosol particles at low temperatures. 2. Theoretical and experimental hygroscopic properties of laboratory generated aerosols | |
dc.type | 01A - Beitrag in wissenschaftlicher Zeitschrift | |
dc.volume | 36 | |
dspace.entity.type | Publication | |
fhnw.InventedHere | No | |
fhnw.ReviewType | Anonymous ex ante peer review of a complete publication | |
fhnw.affiliation.hochschule | Hochschule für Technik | de_CH |
fhnw.affiliation.institut | lnstitut für Sensorik und Elektronik | de_CH |
fhnw.openAccessCategory | Closed | |
fhnw.pagination | 63-68 | |
fhnw.publicationState | Published | |
relation.isAuthorOfPublication | 05dd9a19-7a24-4325-805a-2d121483b168 | |
relation.isAuthorOfPublication.latestForDiscovery | 05dd9a19-7a24-4325-805a-2d121483b168 |
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