Key Roles of Bulk Viscosity and Acidity on Liquid–Liquid Phase Separation of Atmospheric Organic–Inorganic Mixed Aerosols

The Journal of Physical Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Апрель 22, 2025

Liquid-liquid phase separation (LLPS) and the resulting particle morphologies in atmospheric organic-inorganic mixed aerosols are key regulators of aerosol chemistry climate forcing. However, influence coexisting viscous water-soluble organic compounds (WSOCs) on LLPS behavior complex multicomponent systems remains poorly understood. In this study, we introduced three representative WSOCs, i.e., sucrose (SUC), glycerol (GLY), citric acid (CA), to increase bulk viscosity a model system composed 1,2,6-hexanetriol (HXT) ammonium sulfate (AS). Using microscopic imaging techniques predictions, examined impact mass transfer limitations LLPS. As WSOC fractions increased, both relative humidity (SRH) efflorescence (ERH) progressively decreased. For HXT/AS/SUC HXT/AS/CA with molar ratios 1:1:0.5 1:1:0.75, was completely suppressed, although still occurred. 1:1:1 mixtures, neither nor observed. contrast, addition GLY caused minimal changes transitions due its minor effect aqueous-phase viscosity. Additionally, reducing acidity, along transformation CA into salts, alleviated molecular transport limitations, leading increased SRH ERH values for mixtures. These findings critical advancing high-resolution state modeling assessing implications presence or absence

Язык: Английский

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The phase state and viscosity of organic aerosol and related impacts on atmospheric physicochemical processes: A review

Atmospheric Environment, Год журнала: 2024, Номер 343, С. 120985 - 120985

Опубликована: Дек. 11, 2024

Язык: Английский

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Concluding remarks: Atmospheric chemistry in cold environments

Faraday Discussions, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

This paper summarizes the meeting on Atmospheric Chemistry in Cold Environments held London. It puts into context of this rapidly evolving scientific field and provides perspectives based discussions. Photo credit: K. Jacot.

Язык: Английский

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Viscosity and Phase State of Wildfire Smoke Particles in the Stratosphere from Pyrocumulonimbus Events: An Initial Assessment

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Апрель 17, 2025

Understanding the viscosity and phase state of biomass-burning organic aerosol (BBOA) from wildfires pyrocumulonimbus (pyroCb) events in stratosphere is critical for predicting their role stratospheric multiphase chemistry ozone depletion. However, BBOA under conditions, including interactions with sulfuric acid (H2SO4), remain largely unquantified. In this study, we combine laboratory data a thermodynamic model to predict conditions. Our results suggest that H2SO4-to-BBOA mass ratio 0.37─an estimated upper limit pyroCb smoke lower after two months aging─is highly viscous frequently exists glassy state. Even at higher 0.79─an nine aging─BBOA can still transition certain state, bulk reactions are suppressed, may be limited particle surfaces. We also highlight key areas future research needed better constrain its subsequent impact on ozone.

Язык: Английский

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Molecular Characterization of Atmospheric Organic Aerosols: Contemporary Applications of High-resolution Mass Spectrometry

TrAC Trends in Analytical Chemistry, Год журнала: 2024, Номер 181, С. 117986 - 117986

Опубликована: Сен. 25, 2024

Язык: Английский

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