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Atmospheric aerosols, by backscattering solar radiation, attenuate the full impact of greenhouse gases. However, by absorbing sunlight, they warm the upper troposphere, thereby affecting its thermal stability, melting the mountain glaciers that feed major rivers, and reducing the persistence and reflectance of clouds. Clinical and epidemiological studies reveal that aerosols also induce detrimental health effects. More than half of the mass of tropospheric aerosols consists of complex organic matter largely derived from the chemical transformation of (natural and anthropogenic) gas emissions into species that can attach to seed particles. Additionally, organic matter is one of the main contributors to aerosol absorptivity in the near-UV−visible ranges. For the previous reasons, our laboratory studies the missing mechanisms of secondary organic aerosol (SOA) production from heterogeneous oxidations and sunlight photolysis. Our work explores how chemical reactions of atmospheric interest proceed "on surfaces" and "in water" under tropospheric conditions. These studies will contribute to understand the daily cycles of aerosol absorption observed in the field, and that may introduce a key feedback in the earth’s radiative balance.
References:
Feature Papers in Photochemistry. M.I. Guzman. Photochem (2024), 4 (4), 511-517; DOI: 10.3390/photochem4040032.
Photocatalysis of Adsorbed Catechol on the Surface of Degussa P25 TiO2 at the Air-Solid Interface. M.A. Hoque, J. Barrios Cossio, and M.I. Guzman. Journal of Physical Chemistry C (2024), 128, 17470-17482, DOI: 10.1021/acs.jpcc.4c05777.
Conversion of Catechol to 4-Nitrocatechol in Aqueous Microdroplets Exposed to O3 and NO2. M.S. Rana, S.T Bradley, and M.I. Guzman. ACS ES&T Air (2024), 1, 80–91, DOI: 10.1021/acsestair.3c00001.
Oxidation of Phenolic Aldehydes by Ozone and Hydroxyl Radicals at the Air-Solid Interface. M.S. Rana and M.I. Guzman. ACS Earth and Space Chemistry (2022), 6, 2900-2909, DOI: 10.1021/acsearthspacechem.2c00206.
Oxidation of Catechols at the Air-Water Interface by Nitrate Radicals. M.S. Rana and M.I. Guzman. Environmental Science and Technology (2022), 56, 15437-15448. DOI: 10.1021/acs.est.2c05640.
Interfacial Oxidative Oligomerization of Catechol. M.I. Guzman, E.A. Pillar-Little, and A.J. Eugene. ACS Omega (2022), 7, 36009–36016. DOI: 10.1021/acsomega.2c05290.
Reactivity of aminophenols in forming nitrogen-containing brown carbon from iron-catalyzed reactions. H.A. Al-Abadleh, F. Motaghedi, W. Mohammed, M.S. Rana, K.A. Malek, D. Rastogi, A.A. Asa-Awuku, and M.I. Guzman. Communications Chemistry (2022) 5, 112. DOI: 10.1038/s42004-022-00732-1. PDF
Surface Oxidation of Phenolic Aldehydes: Fragmentation, Functionalization, and Coupling Reactions. M.S. Rana and M.I. Guzman. Journal of Physical Chemistry A (2022), 126, 6502-6516; DOI: 10.1021/acs.jpca.2c04963.
Characteristics and health effects of particulate matter emitted from a waste sorting plant. A. Barkhordari, M.I. Guzman, G. Ebrahimzadeh, A. Sorooshian, M. Delikhoon, M.J. Rastani, S. Golbaz, M. Fazlzadeh, R. Nabizadeh, A.N. Baghani. Waste Management (2022), 150, 244-256. PDF
Characteristics and assessing biological risks of airborne bacteria in waste sorting plant. A.N. Baghani, S. Golbaz, G. Ebrahimzadeh, M.I. Guzman, M Delikhoon, M.J. Rastani, A. Barkhordarie, R. Nabizadeh. Ecotoxicology and Environmental Safety (2022) 232, 113272. https://www.sciencedirect.com/science/article/pii/S0147651322001129
Aqueous photochemistry of 2-oxocarboxylic acids: Evidence, mechanisms, and atmospheric impact. M.I. Guzman and A.J. Eugene. Molecules (2021), 26 (17), 5278, https://doi.org/10.3390/molecules26175278. PDF
Modes of transmission of severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) and factors influencing on the airborne transmission: a review. M. Delikhoon, M.I. Guzman, R. Nabizadeh, A.N. Baghani. International Journal of Environmental Research and Public Health (2021), 18 (2), 395; DOI: 10.3390/ijerph18020395. PDF
An Overview of the Effect of Bioaerosol Size in COVID-19 Transmission. M.I. Guzman. International Journal of Health Planning and Management (2020). DOI: 10.1002/hpm.3095. PDF
Dark iron-catalyzed reactions in acidic and viscous aerosol systems efficiently form secondary brown carbon. H.A. Al-Abadleh, M.S. Rana, W. Mohammed, and M.I. Guzman. Environmental Science and Technology (2021), 55, 209-219, DOI: 10.1021/acs.est.0c05678. PDF
Application of a Small Unmanned Aerial System to Measure Ammonia Emissions from a Pilot Amine-CO2 Capture System. T.J. Schuyler, B. Irvin, K. Abad, J.T. Thompson, K. Liu and M.I. Guzman. Sensors (2020), 20 (23), 6974; DOI: 10.3390/s20236974. PDF
Atmospheric Measurements with Unmanned Aerial Systems (UAS). M.I. Guzman. Atmosphere (2020), 11 (11), 1208, DOI: 10.3390/atmos11111208. PDF
Oxidation of phenolic aldehydes by ozone and hydroxyl radicals at the air-water interface. M.S. Rana and M.I. Guzman. Journal of Physical Chemistry A (2020), 124, 8822-8833, DOI: 10.1021/acs.jpca.0c05944. PDF
Production of Singlet Oxygen (1O2) During the Photochemistry of Aqueous Pyruvic Acid: The Effects of pH and Photon Flux under Steady State O2(aq) Concentration. A.J. Eugene and M.I. Guzman. Environmental Science and Technology (2019), 12425-12432, DOI: 10.1021/acs.est.9b03742.
Monitoring Tropospheric Gases with Small Unmanned Aerial Systems (sUAS) during the Second CLOUDMAP Flight Campaign. T.J. Schuyler, S.C.C. Bailey, and M.I. Guzman. Atmosphere (2019), 10 (8), 434, DOI:10.3390/atmos10080434. PDF
Crystal Structure of Zymonic Acid and a Redetermination of its Precursor, Pyruvic Acid. D. Heger, A.J. Eugene, S.R. Parkin and M.I. Guzman. Accepted for publication in Acta Crystallographica Section E: Crystallographic Communications (2019), E75, 858-862, DOI: 10.1107/S2056989019007072. PDF
Intercomparison of Small Unmanned Aircraft Systems (sUAS) Measurements for Atmospheric Science during the LAPSE-RATE Campaign. L. Barbieri, S.T. Kral, S.C.C. Bailey, A.E. Frazier, J.D. Jacob, J. Reuder, D. Brus, P.B. Chilson, C. Crick, C. Detweiler, A. Doddi, J. Elston, H. Foroutan, J. Gonzalez-Rocha, B.R. Greene, M.I. Guzman, A.L. Houston, A. Islam, O. Kemppinen, D. Lawrence, E.A. Pillar-Little, S.D. Ross, M. Sama, D.G. Schmale III, T.J. Schuyler, A. Shankar, S.W. Smith, S. Waugh, C. Dixon, S. Borenstein, and G. de Boer. Sensors (2019), 19 (9), 2179. DOI: 10.3390/s19092179. PDF
Using a Balloon Launched Unmanned Glider to Validate Real-Time WRF Modeling. T.J. Schuyler, S.M.I. Gohari, G. Pundsack, D. Berchoff, and M.I. Guzman. Sensors (2019), 19 (8), 1914, DOI: 10.3390/s19081914. PDF.
The Effects of Reactant Concentration and Air Flow Rate in the Consumption of Dissolved O2 During the Photochemistry of Aqueous Pyruvic Acid. A.J. Eugene and M.I. Guzman. Molecules (2019), 24 (6), 1124, DOI: 113390/molecules24061124. PDF
An Overview of Dynamic Heterogeneous Oxidations in the Troposphere. E.A. Pillar-Little and M.I. Guzman. Environments (2018), 5 (9), 104, DOI: 10.3390/environments5090104. PDF
Cross Photoreaction of Glyoxylic and Pyruvic Acids in Model Aqueous Aerosol. S.-S. Xia, A.J. Eugene, and M.I. Guzman. Journal of Physical Chemistry A (2018), 122, 6457-6466, DOI: 10.1021/acs.jpca.8b05724. PDF
Enhanced Acidity of Acetic and Pyruvic Acids on the Surface of Water. A.J. Eugene, E.A. Pillar, A.J. Colussi, and M.I. Guzman. Langmuir (2018),34, 9307-9313, DOI: 10.1021/acs.langmuir.8b01606. PDF
Reply to "Comment on 'Reactivity of Ketyl and Acetyl Radicals from Direct Solar Actinic Photolysis of Aqueous Pyruvic Acid.'" A.J. Eugene and M.I. Guzman. Journal of Physical Chemistry A (2017), 121, 8741-8744, DOI: 10.1021/acs.jpca.7b08273. PDF
Unmanned Aerial Systems for Monitoring Trace Tropospheric Gases. T.J. Schuyler and M.I. Guzman, Atmosphere (2017), 8 (10), 206, DOI: 10.3390/atmos8100206. PDF
Oxidation of Substituted Catechols at the Air-Water Interface: Production of Carboxylic Acids, Quinones, and Polyphenols. E.A. Pillar and M.I. Guzman. Environmental Science and Technology (2017), 51, 4951-4959, DOI: 10.1021/acs.est.7b00232. PDF
Reactivity of Ketyl and Acetyl Radicals from Direct Solar Actinic Photolysis of Aqueous Pyruvic Acid. A.J. Eugene and M.I. Guzman. Journal of Physical Chemistry A (2017), 121, 2924-2935, DOI: 10.1021/acs.jpca.6b11916. PDF
Nitrate Radicals and Biogenic Volatile Organic Compounds:Oxidation, Mechanisms and Organic Aerosol. N.L. Ng, S.S. Brown, A.T. Archibald, E. Atlas, R.C. Cohen, J.N. Crowley, D.A. Day, N.M. Donahue, J.L. Fry, H. Fuchs, R.J. Griffin, M.I. Guzman, H. Herrmann, A. Hodzic, Y. Iinuma, J.L. Jimenez, A. Kiendler-Scharr, B.H. Lee, D.J. Luecken, J. Mao, R. McLaren, A. Mutzel, H.D. Osthoff, B. Ouyang, B. Picquet-Varrault, U. Platt, H.O.T. Pye, Y. Rudich, R.H. Schwantes, M. Shiraiwa, J. Stutz, J.A. Thornton, A. Tilgner, B.J. Williams, R.A. Zaveri. Atmospheric Chemistry and Physics (2017), 17, 2103-2162, DOI: 10.5194/acp-17-2103-2017. PDF
Aqueous Photochemistry of Glyoxylic Acid. A.J. Eugene, S.-S. Xia, and M.I. Guzman*. Journal of Physical Chemistry A (2016), 120, 3817-3826, DOI: 10.1021/acs.jpca.6b00225. PDF
Heterogeneous Oxidation of Catechol. E.A. Pillar, R. Zhou, and M.I. Guzman*. Journal of Physical Chemistry A (2015), 119, 10349-10359, DOI: 10.1021/acs.jpca.5b07914. PDF
Secondary Organic Aerosol (SOA) Formation from β-pinene + NO3 System: Effects of Humidity and Peroxy Radical Fate. C.M. Boyd, J. Sanchez, L. Xu, A.J. Eugene, T. Nah, W.-Y. Tuet, M.I. Guzman, and N.L. Ng. Atmospheric Chemistry and Physics (2015), 15, 7497–7522. PDF
Catechol oxidation by ozone and hydroxyl radicals at the air-water interface. E.A. Pillar, R.C. Camm, and M.I. Guzman*. Environmental Science & Technology (2014), 48, 14352-14360. PDF
A review of air-ice chemical and physical interactions (AICI): liquids, quasi-liquids, and solids in snow. T. Bartels-Rausch, H.-W. Jacobi, T.F. Kahan, J.L. Thomas, E.S. Thomson, J.P.D. Abbatt, M. Ammann, J.R. Blackford, H. Bluhm, C. Boxe, F. Domine, M.M. Frey, I. Gladich, M.I. Guzman, D. Heger, Th. Huthwelker, P. Klan, W.F. Kuhs, M.H. Kuo, S. Maus, S.G. Moussa, V.F. McNeill, J.T. Newberg, J.B.C. Pettersson, M. Roeselova, J.R. Sodeau. Atmospheric Chemistry and Physics (2014), 14, 1587-1633. PDF
Negative production of acetoin in the photochemistry of aqueous pyruvic acid. A.J. Eugene, S. Xia, and M.I. Guzman*. Proceedings of the National Academy of Science of the United States of America (2013), 110, E4274-E4275. PDF
Conversion of iodide to hypoiodous acid and iodine in aqueous microdroplets exposed to ozone. E.A. Pillar, M.I. Guzman*, and J.M. Rodriguez. Environmental Science & Technology (2013), 47, 10971-10979. PDF
Organics in Environmental Ices: Sources, Chemistry, and Impacts. V.F. McNeill, A.M. Grannas, J.P.D. Abbatt, M. Ammann, P. Ariya, T. Bartels-Rausch, F. Domine, D.J. Donaldson, M.I. Guzman, D. Heger, T.F. Kahan, P. Klan, S. Masclin, C. Toubin, D. Voisin. Atmospheric Chemistry and Physics (2012), 12, 9653-9678. PDF
Concentration Effects and Ion Properties Controlling the Fractionation of Halides during Aerosol Formation. M.I. Guzman*, R.R. Athalye and J.M. Rodriguez. Journal of Physical Chemistry A (2012), 116, 5428-5435. PDF
Second-generation products contribute substantially to the particle-phase organic material produced by β-caryophyllene ozonolysis. Y.J. Li, Q. Chen, M.I. Guzman, C.K. Chan, and S.T. Martin. Atmospheric Chemistry and Physics (2011), 11, 121-132. PDF
Thermochromism of Model Organic Aerosol Matter. A.G. Rincon, M.I. Guzman, M.R. Hoffmann, and A.J. Colussi. Journal of Physical Chemistry Letters (2010), 1, 368-373. PDF
Optical absorptivity versus molecular composition of model organic aerosol matter. A.G. Rincon, M.I. Guzman, M.R. Hoffmann, and A.J. Colussi. Journal of Physical Chemistry A (2009), 113, 10512-10520. PDF
An overview of snow photochemistry: evidence, mechanisms and impacts. A.M. Grannas, A.E. Jones, J. Dibb, M. Ammann, C. Anastasio, H. Beine, M. Bergin, J. Bottenheim, C.S. Boxe, G. Carver, J.H. Crawford, F. Domine, M.M. Frey, M.I. Guzman, D. Heard, D. Helmig, M.R. Hoffmann, R.E. Honrath, L.G. Huey, M. Hutterli, H.W. Jacobi, P. Klan, B. Lefer, J. McConnell, J. Plane, R. Sander, J. Savarino, P.B. Shepson, W.R. Simpson, J. Sodeau, R. von Glasgow, R. Weller, E.W. Wolff, T. Zhu. Atmospheric Chemistry and Physics (2007), 7, 4329-4373. PDF
Photolysis of Pyruvic Acid in Ice: Possible Relevance to CO and CO2 Ice Core Record Anomalies. Guzman M.I., M.R. Hoffmann, and A.J. Colussi. Journal of Geophysical Research (2007), 112, D10123, doi:10.1029/2006JD007886. PDF
Cooperative Hydration of Pyruvic Acid in Ice. M.I. Guzman, L. Hildebrandt, A.J. Colussi, and M.R. Hoffmann. Journal of the American Chemical Society (2006), 128, 10621-10624. PDF
Acidity of Frozen Electrolyte Solutions. C. Robinson, C.S. Boxe, M.I. Guzman, A.J. Colussi, and M.R. Hoffmann. Journal of Physical Chemistry B (2006), 110; 7613-7616. PDF
Photoinduced Oligomerization of Aqueous Pyruvic Acid. M.I. Guzman, A.J. Colussi, and M.R. Hoffmann. Journal of Physical Chemistry A (2006), 110, 3619-3626. PDF
Photogeneration of Distant Radical Pairs in Aqueous Pyruvic Acid Glasses. M.I. Guzman, A.J. Colussi, and M.R. Hoffmann. Journal of Physical Chemistry A (2006), 110; 931-935. PDF
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