Changes of hygroscopicity and morphology during ageing of diesel soot
By T. Tritscher, Z. Jurányi, Maria P. Martin, R. Chirico, Martin Gysel, M. Heringa, P. DeCarlo, B. Sierau, A. Prévôt, E. Weingartner and 1 more. 2011
176 citations recorded by the source corpus.
Soot particles are an important component of atmospheric aerosol and their interaction with water is important for their climate effects. The hygroscopicity of fresh and photochemically aged soot and secondary organic aerosol (SOA) from diesel passenger car emissions was studied under atmospherically relevant conditions in a smog chamber at sub-and supersaturation of water vapor. Fresh soot particles show no significant hygroscopic growth nor cloud condensation nucleus (CCN) activity. Ageing by condensation of SOA formed by photooxidation of the volatile organic carbon (VOC) emission leads to increased water uptake and CCN activity as well as to a compaction of the initially non-spherical soot particles when exposed to high relative humidity (RH). It is important to consider the latter effect for the interpretation of mobility based measurements. The vehicle with oxidation catalyst (EURO3) emits much fewer VOCs than the vehicle without after-treatment (EURO2). Consequently, more SOA is formed for the latter, resulting in more pronounced effects on particle hygroscopicity and CCN activity. Nevertheless, the aged soot particles did not reach the hygroscopicity of pure SOA particles formed from diesel VOC emissions, which are similarly hygroscopic (0.06 < κH − TDMA < 0.12 and 0.09 < κCCN < 0.14) as SOA from other precursor gases investigated in previous studies.
Subfields: Atmospheric Science, Automotive Engineering, Health, Toxicology and Mutagenesis
View Paper: https://www.semanticscholar.org/paper/6f29d3c3b478faff9a33107fbb4d1dd07d3ffda1
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In Atmospheric Science
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Citations in the corpus
- Fractal Dimensions and Mixing Structures of Soot Particles during Atmospheric Processing (2017, background): “47 These fresh soot particles are hydrophobic before being affected 230 by secondary aerosols and condensable vapors in the atmosphere.(48) Therefore, fresh 231 soot particles can hardly collapse and their structures remain largely unchanged.”
- Morphology and mixing state of aged soot particles at a remote marine free troposphere site: Implications for optical properties (2015, background): “It has been hypothesized that the capillary forces induced during condensation or filling of soot cavities with water may be responsible for the soot restructuring [Tritscher et al., 2011].”