Hygroscopicity of aerosol particles at low temperatures. 2. Theoretical and experimental hygroscopic properties of laboratory generated aerosols
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Author (Corporation)
Publication date
21.11.2001
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01A - Journal article
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Parent work
Environmental Science & Technology
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Volume
36
Issue / Number
1
Pages / Duration
63-68
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Publisher / Publishing institution
American Chemical Society
Place of publication / Event location
Washington, D.C.
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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.
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ISBN
ISSN
0013-936X
1520-5851
1520-5851
Language
English
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No
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Publication status
Published
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Peer review of the complete publication
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Closed
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Citation
Gysel, M., Weingartner, E., & Baltensperger, U. (2001). Hygroscopicity of aerosol particles at low temperatures. 2. Theoretical and experimental hygroscopic properties of laboratory generated aerosols. Environmental Science & Technology, 36(1), 63–68. https://doi.org/10.1021/es010055g