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Area of Science:

  • Atmospheric Chemistry
  • Physical Chemistry
  • Aerosol Science

Background:

  • Diffusivity of small molecules in viscous secondary organic aerosol (SOA) is poorly understood.
  • Existing data focus on water and larger compounds, neglecting crucial small molecules like carbon dioxide (CO2).

Purpose of the Study:

  • To accurately measure carbon dioxide (CO2) diffusivity in secondary organic aerosol (SOA) proxies.
  • To understand the impact of viscosity and relative humidity on CO2 diffusion in SOA.

Main Methods:

  • Utilized photochemically generated CO2 within single aqueous citric acid particles.
  • Employed an electrodynamic balance to levitate particles and deduce CO2 diffusivity.
  • Investigated diffusion across varying relative humidities and particle viscosities.

Main Results:

  • Found CO2 diffusivities (DCO) of approximately 10^-14 m^2 s^-1 in medium-viscosity SOA at 25-40% RH.
  • Observed DCO of approximately 10^-16 m^2 s^-1 under dry, high-viscosity conditions.
  • CO2 diffusion was significantly faster than water diffusion in dry, viscous conditions.

Conclusions:

  • CO2 diffusion is not a limiting factor for the chemical degradation of atmospheric SOA particles.
  • The findings challenge previous assumptions about gas diffusion limitations in viscous aerosols.