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Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments

Sulfuric acid, amines and oxidized organics have been found to be important compounds in the nucleation and initial growth of atmospheric particles. Because of the challenges involved in determining the chemical composition of objects with very small mass, however, the properties of the freshly nucl...

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Autores principales: Kim, J, Ahlm, L, Yli-Juuti, T, Lawler, M, Keskinen, H, Tröstl, J, Schobesberger, S, Duplissy, J, Amorim, A, Bianchi, F, Donahue, N M, Flagan, R C, Hakala, J, Heinritzi, M, Jokinen, T, Kürten, A, Laaksonen, A, Lehtipalo, K, Miettinen, P, Petäjä, T, Rissanen, M P, Rondo, L, Sengupta, K, Simon, M, Tomé, A, Williamson, C, Wimmer, D, Winkler, P M, Ehrhart, S, Ye, P, Kirkby, J, Curtius, J, Baltensperger, U, Kulmala, M, Lehtinen, K E J, Smith, J N, Riipinen, I, Virtanen, A
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.5194/acp-16-293-2016
http://cds.cern.ch/record/2268408
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author Kim, J
Ahlm, L
Yli-Juuti, T
Lawler, M
Keskinen, H
Tröstl, J
Schobesberger, S
Duplissy, J
Amorim, A
Bianchi, F
Donahue, N M
Flagan, R C
Hakala, J
Heinritzi, M
Jokinen, T
Kürten, A
Laaksonen, A
Lehtipalo, K
Miettinen, P
Petäjä, T
Rissanen, M P
Rondo, L
Sengupta, K
Simon, M
Tomé, A
Williamson, C
Wimmer, D
Winkler, P M
Ehrhart, S
Ye, P
Kirkby, J
Curtius, J
Baltensperger, U
Kulmala, M
Lehtinen, K E J
Smith, J N
Riipinen, I
Virtanen, A
author_facet Kim, J
Ahlm, L
Yli-Juuti, T
Lawler, M
Keskinen, H
Tröstl, J
Schobesberger, S
Duplissy, J
Amorim, A
Bianchi, F
Donahue, N M
Flagan, R C
Hakala, J
Heinritzi, M
Jokinen, T
Kürten, A
Laaksonen, A
Lehtipalo, K
Miettinen, P
Petäjä, T
Rissanen, M P
Rondo, L
Sengupta, K
Simon, M
Tomé, A
Williamson, C
Wimmer, D
Winkler, P M
Ehrhart, S
Ye, P
Kirkby, J
Curtius, J
Baltensperger, U
Kulmala, M
Lehtinen, K E J
Smith, J N
Riipinen, I
Virtanen, A
author_sort Kim, J
collection CERN
description Sulfuric acid, amines and oxidized organics have been found to be important compounds in the nucleation and initial growth of atmospheric particles. Because of the challenges involved in determining the chemical composition of objects with very small mass, however, the properties of the freshly nucleated particles and the detailed pathways of their formation processes are still not clear. In this study, we focus on a challenging size range, i.e., particles that have grown to diameters of 10 and 15 nm following nucleation, and measure their water uptake. Water uptake is useful information for indirectly obtaining chemical composition of aerosol particles. We use a nanometer-hygroscopicity tandem differential mobility analyzer (nano-HTDMA) at subsaturated conditions (ca. 90 % relative humidity at 293 K) to measure the hygroscopicity of particles during the seventh Cosmics Leaving OUtdoor Droplets (CLOUD7) campaign performed at CERN in 2012. In CLOUD7, the hygroscopicity of nucleated nanoparticles was measured in the presence of sulfuric acid, sulfuric acid–dimethylamine, and sulfuric acid–organics derived from α-pinene oxidation. The hygroscopicity parameter κ decreased with increasing particle size, indicating decreasing acidity of particles. No clear effect of the sulfuric acid concentration on the hygroscopicity of 10 nm particles produced from sulfuric acid and dimethylamine was observed, whereas the hygroscopicity of 15 nm particles sharply decreased with decreasing sulfuric acid concentrations. In particular, when the concentration of sulfuric acid was 5.1 × $10^6$ molecules $cm^{−3}$ in the gas phase, and the dimethylamine mixing ratio was 11.8 ppt, the measured κ of 15 nm particles was 0.31 ± 0.01: close to the value reported for dimethylaminium sulfate (DMAS) (κDMAS ∼ 0.28). Furthermore, the difference in κ between sulfuric acid and sulfuric acid–imethylamine experiments increased with increasing particle size. The κ values of particles in the presence of sulfuric acid and organics were much smaller than those of particles in the presence of sulfuric acid and dimethylamine. This suggests that the organics produced from α-pinene ozonolysis play a significant role in particle growth even at 10 nm sizes.
id oai-inspirehep.net-1603416
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
record_format invenio
spelling oai-inspirehep.net-16034162019-09-30T06:29:59Zdoi:10.5194/acp-16-293-2016http://cds.cern.ch/record/2268408engKim, JAhlm, LYli-Juuti, TLawler, MKeskinen, HTröstl, JSchobesberger, SDuplissy, JAmorim, ABianchi, FDonahue, N MFlagan, R CHakala, JHeinritzi, MJokinen, TKürten, ALaaksonen, ALehtipalo, KMiettinen, PPetäjä, TRissanen, M PRondo, LSengupta, KSimon, MTomé, AWilliamson, CWimmer, DWinkler, P MEhrhart, SYe, PKirkby, JCurtius, JBaltensperger, UKulmala, MLehtinen, K E JSmith, J NRiipinen, IVirtanen, AHygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experimentsPhysics in GeneralSulfuric acid, amines and oxidized organics have been found to be important compounds in the nucleation and initial growth of atmospheric particles. Because of the challenges involved in determining the chemical composition of objects with very small mass, however, the properties of the freshly nucleated particles and the detailed pathways of their formation processes are still not clear. In this study, we focus on a challenging size range, i.e., particles that have grown to diameters of 10 and 15 nm following nucleation, and measure their water uptake. Water uptake is useful information for indirectly obtaining chemical composition of aerosol particles. We use a nanometer-hygroscopicity tandem differential mobility analyzer (nano-HTDMA) at subsaturated conditions (ca. 90 % relative humidity at 293 K) to measure the hygroscopicity of particles during the seventh Cosmics Leaving OUtdoor Droplets (CLOUD7) campaign performed at CERN in 2012. In CLOUD7, the hygroscopicity of nucleated nanoparticles was measured in the presence of sulfuric acid, sulfuric acid–dimethylamine, and sulfuric acid–organics derived from α-pinene oxidation. The hygroscopicity parameter κ decreased with increasing particle size, indicating decreasing acidity of particles. No clear effect of the sulfuric acid concentration on the hygroscopicity of 10 nm particles produced from sulfuric acid and dimethylamine was observed, whereas the hygroscopicity of 15 nm particles sharply decreased with decreasing sulfuric acid concentrations. In particular, when the concentration of sulfuric acid was 5.1 × $10^6$ molecules $cm^{−3}$ in the gas phase, and the dimethylamine mixing ratio was 11.8 ppt, the measured κ of 15 nm particles was 0.31 ± 0.01: close to the value reported for dimethylaminium sulfate (DMAS) (κDMAS ∼ 0.28). Furthermore, the difference in κ between sulfuric acid and sulfuric acid–imethylamine experiments increased with increasing particle size. The κ values of particles in the presence of sulfuric acid and organics were much smaller than those of particles in the presence of sulfuric acid and dimethylamine. This suggests that the organics produced from α-pinene ozonolysis play a significant role in particle growth even at 10 nm sizes.oai:inspirehep.net:16034162016
spellingShingle Physics in General
Kim, J
Ahlm, L
Yli-Juuti, T
Lawler, M
Keskinen, H
Tröstl, J
Schobesberger, S
Duplissy, J
Amorim, A
Bianchi, F
Donahue, N M
Flagan, R C
Hakala, J
Heinritzi, M
Jokinen, T
Kürten, A
Laaksonen, A
Lehtipalo, K
Miettinen, P
Petäjä, T
Rissanen, M P
Rondo, L
Sengupta, K
Simon, M
Tomé, A
Williamson, C
Wimmer, D
Winkler, P M
Ehrhart, S
Ye, P
Kirkby, J
Curtius, J
Baltensperger, U
Kulmala, M
Lehtinen, K E J
Smith, J N
Riipinen, I
Virtanen, A
Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments
title Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments
title_full Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments
title_fullStr Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments
title_full_unstemmed Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments
title_short Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments
title_sort hygroscopicity of nanoparticles produced from homogeneous nucleation in the cloud experiments
topic Physics in General
url https://dx.doi.org/10.5194/acp-16-293-2016
http://cds.cern.ch/record/2268408
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