Communication Dans Un Congrès Année : 2025

Exploring the Interfacial Chemistry of Atmospheric Aerosols... from Water to Organic-Rich Microdroplet

Résumé

Aerosols and clouds play a crucial role in tropospheric chemistry. These airborne particles, ranging in size from a few nanometers to tens of micrometers, significantly influence atmospheric composition, contribute to uncertainties in climate projections, and are responsible for millions of deaths annually. As a result, they have profound societal and economic implications. Despite their importance, a significant knowledge gap remains in our understanding of their chemical evolution throughout their atmospheric lifetime. While water molecules in bulk liquid are generally stable and inert under ambient conditions, increasing evidence suggests that OH radicals and hydrogen peroxide can form spontaneously at the air–water interface of aqueous droplets. However, in real-world conditions, submicron aerosols are rarely composed of pure water; instead, they contain complex mixtures of inorganic and organic compounds. Their phase state varies with relative humidity, transitioning from solid at low humidity to liquid upon deliquescence. This presentation explores the atmospheric significance of interfacial (dark) oxidant production. Through systematic experimental investigations—utilizing aerosol flow tube measurements combined with advanced analytical techniques—it examines the influence of droplet size, ionic composition, relative humidity, and acidity. By covering conditions from water-rich to organic-rich droplets, this research extends our understanding from fog environments to ambient organic aerosols.

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Dates et versions

hal-05082108 , version 1 (23-05-2025)

Identifiants

  • HAL Id : hal-05082108 , version 1

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C. George. Exploring the Interfacial Chemistry of Atmospheric Aerosols... from Water to Organic-Rich Microdroplet. Pacifichem 2025, Dec 2025, Honolulu, United States. ⟨hal-05082108⟩
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