Articles | Volume 23, issue 1
Research article
05 Jan 2023
Research article |  | 05 Jan 2023

Impact of phase state and non-ideal mixing on equilibration timescales of secondary organic aerosol partitioning

Meredith Schervish and Manabu Shiraiwa

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Cited articles

Chang, E. I. and Pankow, J. F.: Prediction of activity coefficients in liquid aerosol particles containing organic compounds, dissolved inorganic salts, and water – Part 2: Consideration of phase separation effects by an X-UNIFAC model, Atmos. Environ., 40, 6422–6436,, 2006. a
Cummings, B. E., Li, Y., DeCarlo, P. F., Shiraiwa, M., and Waring, M. S.: Indoor aerosol water content and phase state in U.S. residences: impacts of relative humidity, aerosol mass and composition, and mechanical system operation, Environ. Sci.-Proc. Imp., 22, 2031–2057,, 2020. a
Donahue, N. M., Robinson, A. L., Stanier, C. O., and Pandis, S. N.: Coupled Partitioning, Dilution, and Chemical Aging of Semivolatile Organics, Environ. Sci. Technol., 40, 2635–2643,, 2006. a
Freedman, M. A.: Phase separation in organic aerosol, Chem. Soc. Rev., 46, 7694–7705,, 2017. a
Freedman, M. A.: Liquid–Liquid Phase Separation in Supermicrometer and Submicrometer Aerosol Particles, Accounts Chem. Res., 53, 1102–1110,, 2020. a
Short summary
Secondary organic aerosols (SOAs) can exhibit complex non-ideal behavior and adopt an amorphous semisolid state. We simulate condensation of semi-volatile compounds into a phase-separated particle to investigate the effect of non-ideality and particle phase state on the equilibration timescale of SOA partitioning. Our results provide useful insights into the interpretation of experimental observations and the description and treatment of SOA in aerosol models.
Final-revised paper