NDLI: Changes of hygroscopicity and morphology during ageing of diesel soot

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Changes of hygroscopicity and morphology during ageing of diesel soot

Content Provider	Semantic Scholar
Author	Tritscher, Torsten Jurányi, Zsófia Martin, Matthieu Chirico, Roberto Gysel, Martin Heringa, Maarten F. DeCarlo, Peter F. Sierau, Berko Prévôt, André S. H. Weingartner, Ernest Baltensperger, Urs
Copyright Year	2011
Abstract	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 suband 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.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://aerosolsoftware.web.psi.ch/internet/publications/Tritscher_2011_ERL_Diesel_HTDMA_CCNC.pdf
Language	English
Access Restriction	Open
Subject Keyword	Aerosol Dose Form Aging Carbon Tetrachloride Cell Nucleus Chimeric antigen receptor Cyclomatic complexity Data compaction Diesel Exhaust Particulate Emission - Male genitalia finding Galaxy morphological classification Gases Relative humidity:Relative Mass Concentration:Point in time:Air:Quantitative Smog Soot negative regulation of secondary cell wall biogenesis oxidation vapor
Content Type	Text
Resource Type	Article

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