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  • Pagels, Joakim, et al. (author)
  • Processing of Soot by Controlled Sulphuric Acid and Water Condensation - Mass and Mobility Relationship
  • 2009
  • In: Aerosol Science and Technology. - : Informa UK Limited. - 1521-7388 .- 0278-6826. ; 43:7, s. 629-640
  • Journal article (peer-reviewed)abstract
    • The effects of atmospheric processing on soot particle morphology were studied in the laboratory using the Differential Mobility Analyzer-Aerosol Particle Mass Analyzer (DMA-APM) and the DMA-DMA (Tandem DMA) techniques. To simulate atmospheric processing, combustion soot agglomerates were altered by sulphuric acid vapor condensation, relative humidity (RH) cycling, and evaporation of the sulphuric acid and water by heating. Primary investigated properties were particle mobility size and mass. Secondary properties, derived from these, include effective density, fractal dimension, dynamic shape factor, and the mass fraction of condensed material. A transformation of the soot particles to more compact forms occurs as sulphuric acid and water condense onto fresh soot. The particle mass increases and initially the mobility diameter decreases, indicating restructuring of the soot core, likely due to surface tension forces. For a given soot source and condensing liquid, the degree of compaction depends strongly on the mass (or volume) fraction of condensed material. For water and sulphuric acid condensing on combustion soot, a mass increase of 2-3 times is needed for a transformation to spherical particles. In the limit of spherical particles without voids, the effective density then approaches the inherent material density, the fractal dimension approaches 3 and the dynamic shape factor approaches 1. Our results indicate that under typical atmospheric conditions, soot particles will be fully transformed to spherical droplets on a time scale of several hours. It is expected that the morphology changes and addition of soluble material to soot strongly affect the optical and hygroscopic properties of soot.
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  • Result 211-220 of 321
Type of publication
conference paper (207)
journal article (94)
reports (11)
research review (4)
other publication (3)
doctoral thesis (1)
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book chapter (1)
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Type of content
peer-reviewed (251)
other academic/artistic (67)
pop. science, debate, etc. (3)
Author/Editor
Pagels, Joakim (321)
Swietlicki, Erik (131)
Bohgard, Mats (129)
Rissler, Jenny (105)
Gudmundsson, Anders (95)
Eriksson, Axel (87)
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Wierzbicka, Aneta (86)
Nilsson, Patrik (70)
Löndahl, Jakob (64)
Nordin, Erik (53)
Messing, Maria (46)
Isaxon, Christina (45)
Svenningsson, Birgit ... (42)
Boman, Christoffer (40)
Sanati, Mehri (35)
Malmborg, Vilhelm (30)
Strand, Michael (25)
Hedmer, Maria (24)
Nielsen, Jörn (24)
Tinnerberg, Håkan (24)
Deppert, Knut (23)
Ludvigsson, Linus (23)
Massling, Andreas (22)
Svensson, Christian (22)
Assarsson, Eva (20)
Dahl, Andreas (19)
Roldin, Pontus (19)
Blomberg, Anders (19)
Gren, Louise (19)
Tunér, Martin (18)
Sandström, Thomas (17)
Loft, Steffen (16)
Wittbom, Cerina (16)
Kåredal, Monica (15)
Martinsson, Johan (15)
Nyström, Robin (15)
Hagerman, Inger (15)
Berglund, Margareta (14)
Jönsson, Bo A (13)
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Broberg Palmgren, Ka ... (12)
Andersen, Christina (12)
Omelekhina, Yuliya (12)
Shamun, Sam (12)
Andersson, Ulla B (11)
Shen, Mengqin (11)
Albin, Maria (10)
Cedervall, Tommy (10)
Xu, YiYi (10)
Eriksson, Axel C. (10)
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University
Lund University (315)
Umeå University (15)
University of Gothenburg (8)
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RISE (4)
Luleå University of Technology (3)
Linköping University (3)
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Language
English (315)
Swedish (6)
Research subject (UKÄ/SCB)
Engineering and Technology (225)
Natural sciences (158)
Medical and Health Sciences (65)
Agricultural Sciences (1)
Social Sciences (1)

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