Glyoxal as a Potential Source of Highly Viscous Aerosol Particles

Peters J-H, Dette HP, Koop T (2021)
ACS Earth and Space Chemistry.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
Recent studies have shown that glyoxal may remain in the particle phase of aqueous aerosol particles upon drying despite the high vapor pressure of pure glyoxal, due to the formation of oligomeric glyoxal water adducts with low vapor pressure. Little is known about the phase state of such particles, even though some studies suggested a semisolid or glassy state for dried aqueous glyoxal solutions. In this study, we performed glass transition temperature (Tg) measurements on various aqueous glyoxal systems. We show experimentally that very slow and also fast drying of aqueous glyoxal solutions can indeed lead to the formation of highly viscous semisolid and glassy states, both in bulk as well as in aerosolized samples. Tg changes with the solute concentration before drying, with drying rate and in the presence of additional solutes such as ammonium sulfate or ammonium bisulfate, even when they are present only in catalytic amounts. Temperature-dependent measurements show that the equilibration between various glyoxal species upon water addition, mimicking atmospheric water uptake upon rising humidity, can range from hours to days. We use the measured glass transition temperatures to infer dependencies of the aqueous phase equilibria between monomer, dimer, and trimer glyoxal species and their water adducts and support these by infrared spectroscopy. Our results imply that aqueous glyoxal aerosols may form highly viscous states at atmospherically relevant conditions.
Erscheinungsjahr
2021
Zeitschriftentitel
ACS Earth and Space Chemistry
ISSN
2472-3452
eISSN
2472-3452
Page URI
https://pub.uni-bielefeld.de/record/2959630

Zitieren

Peters J-H, Dette HP, Koop T. Glyoxal as a Potential Source of Highly Viscous Aerosol Particles. ACS Earth and Space Chemistry. 2021.
Peters, J. - H., Dette, H. P., & Koop, T. (2021). Glyoxal as a Potential Source of Highly Viscous Aerosol Particles. ACS Earth and Space Chemistry. https://doi.org/10.1021/acsearthspacechem.1c00245
Peters, Jan-Hendrik, Dette, Hans Peter, and Koop, Thomas. 2021. “Glyoxal as a Potential Source of Highly Viscous Aerosol Particles”. ACS Earth and Space Chemistry.
Peters, J. - H., Dette, H. P., and Koop, T. (2021). Glyoxal as a Potential Source of Highly Viscous Aerosol Particles. ACS Earth and Space Chemistry.
Peters, J.-H., Dette, H.P., & Koop, T., 2021. Glyoxal as a Potential Source of Highly Viscous Aerosol Particles. ACS Earth and Space Chemistry.
J.-H. Peters, H.P. Dette, and T. Koop, “Glyoxal as a Potential Source of Highly Viscous Aerosol Particles”, ACS Earth and Space Chemistry, 2021.
Peters, J.-H., Dette, H.P., Koop, T.: Glyoxal as a Potential Source of Highly Viscous Aerosol Particles. ACS Earth and Space Chemistry. (2021).
Peters, Jan-Hendrik, Dette, Hans Peter, and Koop, Thomas. “Glyoxal as a Potential Source of Highly Viscous Aerosol Particles”. ACS Earth and Space Chemistry (2021).
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