Liquid–liquid phase separation in secondary organic aerosol particles produced from α-pinene ozonolysis and α-pinene photooxidation with/without ammonia
| Autor: | Ho-Jin Lim, Jae Bong Lee, Suhan Ham, Zaeem Bin Babar, Mijung Song |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Atmospheric Science
Pinene Ozonolysis 010504 meteorology & atmospheric sciences Inorganic chemistry chemistry.chemical_element 010501 environmental sciences 01 natural sciences Oxygen Aerosol chemistry.chemical_compound Ammonia chemistry Cloud condensation nuclei Relative humidity Carbon 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Chemistry and Physics. 19:9321-9331 |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-19-9321-2019 |
| Popis: | Recently, liquid–liquid phase separation (LLPS) of secondary organic aerosol (SOA) particles free of inorganic salts has been intensively studied due to the importance of cloud condensation nuclei (CCN) properties. In this study, we investigated LLPS in four different types of SOA particles generated from α-pinene ozonolysis and α-pinene photooxidation in the absence and presence of ammonia (NH3). LLPS was observed in SOA particles produced from α-pinene ozonolysis at ∼95.8 % relative humidity (RH) and α-pinene ozonolysis with NH3 at ∼95.4 % RH. However, LLPS was not observed in SOA particles produced from α-pinene photooxidation and α-pinene photooxidation with NH3. Based on datasets of the average oxygen to carbon elemental ratio (O:C) for different types of SOA particles from this study and from previous studies, there appears to be a relationship between the occurrence of LLPS and the O:C of the SOA particles. When LLPS was observed, the two liquid phases were present up to ∼100 % RH. This result can help more accurately predict the CCN properties of organic aerosol particles. |
| Databáze: | OpenAIRE |
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