Liquid–liquid phase separation in secondary organic aerosol particles produced from α-pinene ozonolysis and α-pinene photooxidation with/without ammonia

Ham, Suhan; Babar, Zaeem Bin; Lee, Jae Bong; Lim, Ho-Jin; Song, Mijung

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 inline-formulaα-pinene ozonolysis and inline-formulaα-pinene photooxidation in the absence and presence of ammonia (inline-formulaNH3). LLPS was observed in SOA particles produced from inline-formulaα-pinene ozonolysis at inline-formula∼95.8 % relative humidity (RH) and inline-formulaα-pinene ozonolysis with inline-formulaNH3 at inline-formula∼95.4 % RH. However, LLPS was not observed in SOA particles produced from inline-formulaα-pinene photooxidation and inline-formulaα-pinene photooxidation with inline-formulaNH3. Based on datasets of the average oxygen to carbon elemental ratio (inline-formulaO: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 inline-formulaO:C of the SOA particles. When LLPS was observed, the two liquid phases were present up to inline-formula∼100 % RH. This result can help more accurately predict the CCN properties of organic aerosol particles.

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Ham, Suhan / Babar, Zaeem Bin / Lee, Jae Bong / et al: Liquid–liquid phase separation in secondary organic aerosol particles produced from α-pinene ozonolysis and α-pinene photooxidation with/without ammonia. 2019. Copernicus Publications.

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