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

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

<p>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...

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Main Authors: S. Ham, Z. B. Babar, J. B. Lee, H.-J. Lim, M. Song
Format: Article
Language:English
Published: Copernicus Publications 2019-07-01
Series:Atmospheric Chemistry and Physics
Online Access:https://www.atmos-chem-phys.net/19/9321/2019/acp-19-9321-2019.pdf
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spelling doaj-7d90ba65726045a28fcd62b5964e9b282020-11-24T21:50:47ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242019-07-01199321933110.5194/acp-19-9321-2019Liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammoniaS. Ham0Z. B. Babar1J. B. Lee2H.-J. Lim3M. Song4Department of Earth and Environmental Sciences, Chonbuk National University, 567 Baekje-daero, Deokjingu, Jeonju-si 54896, Jeollabuk-do, South KoreaDepartment of Environmental Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, South KoreaReactor System Safety Research Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseonggu, Daejeon 34057, South KoreaDepartment of Environmental Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, South KoreaDepartment of Earth and Environmental Sciences, Chonbuk National University, 567 Baekje-daero, Deokjingu, Jeonju-si 54896, Jeollabuk-do, South Korea<p>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 <span class="inline-formula"><i>α</i></span>-pinene ozonolysis and <span class="inline-formula"><i>α</i></span>-pinene photooxidation in the absence and presence of ammonia (<span class="inline-formula">NH<sub>3</sub></span>). LLPS was observed in SOA particles produced from <span class="inline-formula"><i>α</i></span>-pinene ozonolysis at <span class="inline-formula">∼95.8</span>&thinsp;% relative humidity (RH) and <span class="inline-formula"><i>α</i></span>-pinene ozonolysis with <span class="inline-formula">NH<sub>3</sub></span> at <span class="inline-formula">∼95.4</span>&thinsp;%&thinsp;RH. However, LLPS was not observed in SOA particles produced from <span class="inline-formula"><i>α</i></span>-pinene photooxidation and <span class="inline-formula"><i>α</i></span>-pinene photooxidation with <span class="inline-formula">NH<sub>3</sub></span>. Based on datasets of the average oxygen to carbon elemental ratio (<span class="inline-formula">O:C</span>) 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 <span class="inline-formula">O:C</span> of the SOA particles. When LLPS was observed, the two liquid phases were present up to <span class="inline-formula">∼100</span>&thinsp;%&thinsp;RH. This result can help more accurately predict the CCN properties of organic aerosol particles.</p>https://www.atmos-chem-phys.net/19/9321/2019/acp-19-9321-2019.pdf
collection DOAJ
language English
format Article
sources DOAJ
author S. Ham
Z. B. Babar
J. B. Lee
H.-J. Lim
M. Song
spellingShingle S. Ham
Z. B. Babar
J. B. Lee
H.-J. Lim
M. Song
Liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammonia
Atmospheric Chemistry and Physics
author_facet S. Ham
Z. B. Babar
J. B. Lee
H.-J. Lim
M. Song
author_sort S. Ham
title Liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammonia
title_short Liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammonia
title_full Liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammonia
title_fullStr Liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammonia
title_full_unstemmed Liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammonia
title_sort liquid–liquid phase separation in secondary organic aerosol particles produced from <i>α</i>-pinene ozonolysis and <i>α</i>-pinene photooxidation with/without ammonia
publisher Copernicus Publications
series Atmospheric Chemistry and Physics
issn 1680-7316
1680-7324
publishDate 2019-07-01
description <p>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 <span class="inline-formula"><i>α</i></span>-pinene ozonolysis and <span class="inline-formula"><i>α</i></span>-pinene photooxidation in the absence and presence of ammonia (<span class="inline-formula">NH<sub>3</sub></span>). LLPS was observed in SOA particles produced from <span class="inline-formula"><i>α</i></span>-pinene ozonolysis at <span class="inline-formula">∼95.8</span>&thinsp;% relative humidity (RH) and <span class="inline-formula"><i>α</i></span>-pinene ozonolysis with <span class="inline-formula">NH<sub>3</sub></span> at <span class="inline-formula">∼95.4</span>&thinsp;%&thinsp;RH. However, LLPS was not observed in SOA particles produced from <span class="inline-formula"><i>α</i></span>-pinene photooxidation and <span class="inline-formula"><i>α</i></span>-pinene photooxidation with <span class="inline-formula">NH<sub>3</sub></span>. Based on datasets of the average oxygen to carbon elemental ratio (<span class="inline-formula">O:C</span>) 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 <span class="inline-formula">O:C</span> of the SOA particles. When LLPS was observed, the two liquid phases were present up to <span class="inline-formula">∼100</span>&thinsp;%&thinsp;RH. This result can help more accurately predict the CCN properties of organic aerosol particles.</p>
url https://www.atmos-chem-phys.net/19/9321/2019/acp-19-9321-2019.pdf
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