Melissa M. Galloway

Courses: Chem 122: General Chemistry I; CHEM 231: Analytical Chemistry I (lecture and lab); CHEM 252: Environmental Chemistry; CHEM 332: Analytical Chemistry II (lecture and lab)

Research:  My research primarily focuses on reactions that occur within aqueous atmospheric particles. Particulate matter significantly influences climate change and human health. Despite research aimed at elucidating aerosol formation and growth mechanisms, our current understanding of these processes underestimates atmospheric aerosol mass and does not accurately predict particulate properties. The atmosphere is challenging to study due to the incredible complexity of the compounds found in suspended particles such as clouds and aerosol. We can often study a simplified system in the laboratory and then apply what we have learned to the more complex atmosphere; however there are still many reactions that have not been studied and compounds that have not been identified. Research in the Galloway lab has a dual focus; 1) determining the compounds that are formed during the reactions of small carbonyls with ammonium or amines, which are commonly found in atmospheric particles, and 2) determining how these reaction mixtures change when exposed to sunlight. This information will inform atmospheric modelers; if we know the products and reaction rates from a mixture of compounds, we may be able to provide more accurate models of atmospheric particles. This would allow for better predictions of the human health and climate change effects of aerosol.

Selected Publications: 
* undergraduate student coauthors

• Grace, D. N.*; Sharp, J. R.*; Holappa, R. E.*; Lugos, E. N.*; Sebold, M. B.*; Griffith, D. R.; Hendrickson, H. P.; Galloway, M. M., Heterocyclic product formation in aqueous brown carbon systems. ACS Earth Space Chem. 2019, 3 (11), 2472-2481, DOI: 10.1021/acsearthspacechem.9b00235.
• Grace, D. N.*; Sebold, M. B.*; Galloway, M. M., Separation and detection of aqueous atmospheric aerosol mimics using supercritical fluid chromatography–mass spectrometry. Meas. Tech. 2019, 12 (7), 3841-3851, DOI: 10.5194/amt-12-3841-2019.
• Beier, T.*; Cotter, E. R.*; Galloway, M. M.; Woo, J. L., In situ surface tension measurements of hanging droplet methylglyoxal/ammonium sulfate aerosol mimics under photooxidative conditions. ACS Earth Space Chem. 2019, 3 (7), 1208-1215, DOI: 10.1021/acsearthspacechem.9b00123.
• Ackendorf, J. M.*; Ippolito, M. G.*; Galloway, M. M., pH dependence of the imidazole-2-carboxaldehyde hydration equilibrium: Implications for atmospheric light absorbance. Sci. Technol. Lett. 2017, 4 (12), 551-555, DOI: 10.1021/acs.estlett.7b00486.
• Rodriguez, A. A.*; de Loera, A.*; Powelson, M. H.*; Galloway, M. M.; De Haan, D. O., Formaldehyde and acetaldehyde increase aqueous-phase production of imidazoles in methylglyoxal/amine mixtures: Quantifying a secondary organic aerosol formation mechanism. Sci. Technol. Lett. 2017, 4 (6), 234-239, DOI: 10.1021/acs.estlett.7b00129.
• Hawkins, L. N.; Lemire, A. N.*; Galloway, M. M.; Corrigan, A. L.*; Turley, J. J.*; Espelien, B.*; De Haan, D. O., Maillard chemistry in clouds and aqueous aerosol as a source of atmospheric humic-like substances. Sci. Technol. 2016, 20 (14), 7443-7452, DOI: 10.1021/acs.est.6b00909.
• Kua, J.; Rodriguez, A. A.*; Marucci, L. A.*; Galloway, M. M.; De Haan, D. O., Free energy map for the co-oligomerization of formaldehyde and ammonia. Phys. Chem. A 2015, 119 (10), 2122-2131, DOI: 10.1021/jp512396d.
• Galloway, M. M.; Powelson, M. H.*; Sedehi, N.*; Wood, S. E.*; Millage, K. D.*; Kononenko, J. A.*; Rynaski, A. D.*; De Haan, D. O., Secondary organic aerosol formation during evaporation of droplets containing atmospheric aldehydes, amines, and ammonium sulfate. Sci. Technol. 2014, 48 (24), 14417-14425, DOI: 10.1021/es5044479.