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Hygroscopic behavior of inorganic–organic aerosol systems including ammonium sulfate, dicarboxylic acids, and oligome.r

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    0523796 - ÚCHP 2021 RIV GB eng J - Journal Article
    Bouzidi, Hichem - Zuend, A. - Ondráček, Jakub - Schwarz, Jaroslav - Ždímal, Vladimír
    Hygroscopic behavior of inorganic–organic aerosol systems including ammonium sulfate, dicarboxylic acids, and oligome.r.
    Atmospheric Environment. Roč. 229, 15 May (2020), č. článku 117481. ISSN 1352-2310. E-ISSN 1873-2844
    R&D Projects: GA MŠMT(CZ) LM2015037; GA ČR(CZ) GA17-19798S; GA MŠMT(CZ) EF16_013/0001315
    Grant - others:NSERC(CA) RGPIN/04315–2014
    Institutional support: RVO:67985858
    Keywords : aerosol particles * aerosol hygroscopic growth * water uptake
    OECD category: Meteorology and atmospheric sciences
    Impact factor: 4.798, year: 2020
    Method of publishing: Open access
    https://www.sciencedirect.com/journal/atmospheric-environment/vol/229/suppl/C

    We provide indirect evidence for the presence of an organic solid alongside solid AS. Hypothetically, the observed disagreement could also be due to a preferential interaction between –COOH and –CH2OCH2- groups, which may prevent a fraction of the organic acid amount to interact with water. For fully deliquesced particles, good agreement between model predictions and measurements are found for the mixed PEG–organic acids–AS systems. Upon dehydration, when the mass fraction of PEG <20%, the signature of effloresced AS in solid–liquid equilibrium with the remaining solution was observed. However, with higher organic volume fraction, the particles release water gradually without a noticeable efflorescence of AS down to 20% RH. For quinary PEG–organic acids–AS systems, the AIOMFAC-based equilibrium model predicts that liquid–liquid phase separation (LLPS) occurs with a clear distinction between a predominantly electrolyte-rich phase alfa (composed mainly of ammonium and sulfate ions, organic acids and water) and an organic-rich phase beta (composed mainly of PEG). The onset of LLPS is predicted at RH levels of 83–89% depending on the mixed particle’s composition. We also show that a residence time of ~10 s in the humidified section of the HTDMA instrument is sufficient for establishing gas–particle equilibrium of the 100 nm sized organic–inorganic particles studied in this work, this may differ in other cases when highly viscous particles are involved. The measurements offer valuable data for future work on the development and validation of organic solid–liquid equilibrium in thermodynamic models.
    Permanent Link: http://hdl.handle.net/11104/0308142

     
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