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- W4384070567 abstract "Abstract. Water diffusion is a typical thermodynamic process in ambient aerosols which plays pivotal roles in their physicochemical properties, atmospheric lifetime, and influences on the climate and human health. A fair amount of aerosols become phase-separated after experiencing atmospheric aging processes such as efflorescence, amorphization, and liquid-liquid phase separation. However, detecting the hygroscopicity of heterogeneous aerosols is quite intractable. Here, for the first time, we directly characterize the water diffusion in single suspended phase-separated aerosols via a self-constructed laser tweezers Raman spectroscopy (LTRS) system. The H2O/D2O isotope exchange is harnessed to trace the water diffusion in single laser-levitated homogenous/heterogeneous microdroplets. The time-resolved cavity-enhanced Raman spectra of the microdroplets is used to detect the diffusion process in real time. Two archetypes of phase-separated aerosols, i.e., partially engulfed and core-shell, are studied. Moreover, we quantify the dynamic water diffusion process by experimentally measuring the diffusion coefficients. The results show that compared with the homogenous aerosols, water diffusion limitations exist in the phase-separated aerosols. The incomplete diffusion may stem from both the hydrophobicity of the organics and the formation of certain molecule clusters. This work provides possible implications on the evolutions, especially the gas-particle partition, of the actual phase-separated atmospheric aerosols." @default.
- W4384070567 created "2023-07-13" @default.
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- W4384070567 date "2023-07-12" @default.
- W4384070567 modified "2023-10-15" @default.
- W4384070567 title "Measurement Report: Water diffusion in single suspended phase-separated aerosols" @default.
- W4384070567 doi "https://doi.org/10.5194/egusphere-2023-1346" @default.
- W4384070567 hasPublicationYear "2023" @default.
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