at Penn State
Publications
* denotes corresponding author, # undergraduate coauthor
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65) M. A. Freedman*, Q. Huang, K. R. Pitta, Phase Transitions in Organic and Organic/Inorganic Aerosol Particles, Annual Review of Physical Chemistry, 2024, 75, 257-281. https://www.annualreviews.org/content/journals/10.1146/annurev-physchem-083122-115909?TRACK=RSS
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64) E. C. Tackman, K. Jaswal, M. A. Freedman*, Size Dependence of Organic/Inorganic Aerosol Morphology and the Role of Oxidation and Aromaticity of the Organic Component, Environmental Science and Technology: Air, 2024, 1, 405-413. https://pubs.acs.org/doi/full/10.1021/acsestair.3c00099
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63) Q. Huang, K. R. Pitta, K. Constantini#, E.-J. E. Ott, A. Zuend, M. A. Freedman*, Experimental Phase Diagram and Its Temporal Evolution for Submicron 2-Methylglutaric Acid and Ammonium Sulfate Aerosol Particles, Physical Chemistry Chemical Physics, 2024, 26, 2887-2894. https://pubs.rsc.org/en/content/articlelanding/2024/cp/d3cp04411d
2023 HOT PCCP Article
Inside Front Cover: https://pubs.rsc.org/en/content/articlelanding/2024/cp/d4cp90017k
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62) E. C. Tackman, D. N. Higgins, M. V. Johnston, M. A. Freedman*, Morphology of Organic/Inorganic Aerosol with Varying Seed Particle Water Content, ACS Earth and Space Chemistry, 2023, 7, 2105-2118. https://pubs.acs.org/doi/10.1021/acsearthspacechem.3c00202
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61) K. A. Malek, K. Gohil, E. Olonomiyo, Q. Huang (my postdoc), K. R. Pitta (my student), L. Nandy (my postdoc), K. A. Voss# (my undergrad), T. Raymond*, D. D Dutcher*, M. A. Freedman*, A. Asa-Awuku*, Liquid-Liquid Phase Separation can Drive Aerosol Droplet Growth in Supersaturated Regimes, ACS Environmental Au, 2023, 3, 348-360. https://pubs.acs.org/doi/full/10.1021/acsenvironau.3c00015
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60) L. Nandy, J. L. Fenton, M. A. Freedman*, Heterogeneous Ice Nucleation in Model Crystalline Porous Organic Polymers: Influence of Pore Size on Immersion Freezing, Journal of Physical Chemistry A, 2023, 127, 6300-6308. https://pubs.acs.org/doi/10.1021/acs.jpca.3c00071
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59) E. C. Tackman, D. N. Higgins, D. E. Kerecman, E.-J. E. Ott, M. V. Johnston, M. A. Freedman*, The use of transmission electron microscopy with scanning mobility particle size spectrometry for an enhanced understanding of the physical characteristics of aerosol particles generated with a flow tube reactor, Aerosol Science and Technology, 2023, 57, 279-295. https://www.tandfonline.com/doi/full/10.1080/02786826.2023.2173999
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58) K. E. Marak, L. Nandy, D. Jain#, M. A. Freedman*, Significance of the Surface Silica/Alumina Ratio and Surface Silica/Alumina Ratio and Surface Termination on the Immersion Freezing of ZSM-5 Zeolites, Physical Chemistry Chemical Physics, 2023, 25, 11442-11451. https://pubs.rsc.org/en/content/articlelanding/2023/cp/d2cp05466c
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57) P. N. Razafindrambinina, K. A. Malek, K. DiMonte (my student), J. N. Dawson (my student), T. M. Raymond, D. D Dutcher, M. A. Freedman, and A. Asa-Awuku*, Effects of Mixing State on Water-Uptake Properties of Binary Mixtures, Aerosol Science and Technology, 2022, 56, 1009-1021. https://doi.org/10.1080/02786826.2022.2114313
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56) K. E. Marak, J. H. Roebuck#, E. Chong, H. Poitras, M. A. Freedman*, Silica as a Model Ice-Nucleating Particle to Study the Effects of Crystallinity, Porosity and Low-Density Surface Functional Groups on Immersion Freezing, Journal of Physical Chemistry A, 2022, 126, 5965-5973. https://doi.org/10.1021/acs.jpca.2c03063
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55) E. C. Tackman, R. S. Grady#, M. A. Freedman*, Direct Measurement of the pH of Aerosol Particles using Carbon Quantum Dots, Analytical Methods, 2022, 14, 2929 – 2936. https://doi.org/10.1039/D2AY01005D
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54) P. N. Razafindrambinina, K. A. Malek, J. N. Dawson, K. DiMonte, T. M. Raymond, D. D Dutcher, M. A. Freedman, and A. Asa-Awuku*, Hygroscopicity of Internally Mixed Ammonium Sulfate and Secondary Organic Aerosol Particles Formed at Low and High Relative Humidity, Environ. Sci.: Atmos. 2, 202-214 (2022). https://doi.org/10.1039/D1EA00069A
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53) E.-J. E. Ott, M. A. Freedman*, Influence of Ions on the Size Dependent Morphology of Aerosol Particles, ACS Earth and Space Chemistry, 5, 2320-2328 (2021). Special Issue: Mario Molina Memorial.
52) A. Stallworth, E. H. Chase, B. McDevitt, K. E. Marak (my student), M. A. Freedman, R. T. Wilson, W. D. Burgos, N. R. Warner*, Efficacy of Oil and Gas Produced Water as a Dust Suppressant, Science of the Total Environment, 799, 149347 (2021).
51) E.-J. E. Ott, T. M. Kucinski, J. N. Dawson, M. A. Freedman*, Use of Transmission Electron Microscopy for Analysis of Aerosol Particles and Strategies for Imaging Fragile Particles, Analytical Chemistry, 93, 11347-11356 (2021).
50) J. N. Dawson, K. E. DiMonte#, M. J. Griffin#, M. A. Freedman, Ultrafine Particles Emitted through Routine Operation of a Hairdryer, Environmental Science and Technology, 55, 8554-8560 (2021).
*49) T. M. Kucinski, E.-J. E. Ott, M. A. Freedman*, Dynamics of Liquid-Liquid Phase Separation in Submicron Aerosol, Journal of Physical Chemistry A, 125, 4446-4453 (2021). Special Issue: 125 Years of the Journal of Physical Chemistry.
48) E. Chong, K. E. Marak, Y. Li#, M. A. Freedman*, Ice Nucleation Activity of Iron Oxides via Immersion Freezing and an Examination of the High Ice Nucleation Activity of FeO, Physical Chemistry Chemical Physics, 23, 3565-3573 (2021).
47) J. N. Dawson, K. A. Malek, P. N. Razafindrambinina, T. M. Raymond*, D. D Dutcher*, A. Asa-Awuku*, M. A. Freedman*, Direct Comparison of the Submicron Aerosol Hygroscopicity of Water-Soluble Sugars, ACS Earth and Space Chemistry, 4, 2215-2226 (2020).
46) E.-J. E. Ott, M. A. Freedman*, The Inhibition of Phase Separation in Aerosolized Water-Soluble Polymer-Polymer Nanoparticles at Small Sizes and the Effects of Molecular Weight, J. Phys. Chem. B, 124, 7518-7523 (2020).
45) M. A. Freedman*, Liquid-Liquid Phase Separation in Supermicrometer and Submicrometer Aerosol Particles, Accounts of Chemical Research, 52, 1102-1110 (2020). Special Issue: New Frontiers in Chemistry-Climate Interactions.
44) T. M. Kucinski, M. A. Freedman*, Flash Freeze Flow Tube to Vitrify Aerosol Particles at Fixed Relative Humidity Values, Analytical Chemistry, 92, 5207-5213 (2020).
43) E.-J. E. Ott, E. M. Tackman, M. A. Freedman*, Effects of Sucrose on Phase Transitions of Organic/Inorganic Aerosols, ACS Earth and Space Chemistry, 4, 591-601 (2020).
42) T. M. Kucinski, J. N. Dawson, M. A. Freedman*, Size-Dependent Liquid-Liquid Phase Separation in Atmospherically Relevant Complex Systems, Journal of Physical Chemistry Letters, 10, 6915-6920 (2019).
41) E. Chong, M. King#, K. E. Marak, M. A. Freedman*, The Effect of Crystallinity and Crystal Structure on the Immersion Freezing of Alumina Aerosol, Journal of Physical Chemistry A, 123, 2447-2456 (2019). Special Virtual Issue: Young Scientists.
40) M. A. Freedman*, E.-J. E. Ott, K. E. Marak, Role of pH in Aerosol Processes and Measurement Challenges, Journal of Physical Chemistry A, 123, 1275-1284 (2019). JPCA Feature Article. ACS Editors’ Choice Article.
39) D. J. Losey, S. K. Sihvonen, D. P. Veghte, E. Chong, M. A. Freedman*, Acidic Processing of Fly Ash: Chemical Characterization, Morphology, and Immersion Freezing, Environmental Science: Processes & Impacts, 20, 1581-1592 (2018).
38) V. J. Alstadt, K. T. Jansen#, E.-J. E. Ott, M. B. Altaf, M. A. Freedman*, Local Aerosol Composition Before and During the Transition from Coal-fired Power to Natural Gas, Atmospheric Environment, 190, 169-176 (2018).
37) M. B. Altaf, D. D. Dutcher, T. M. Raymond, M. A. Freedman*, Effect of Particle Morphology on Cloud Condensation Nuclei Activity, ACS Earth and Space Chemistry, 2, 634-639 (2018).
36) D. J. Losey, E.-J. E. Ott, M. A. Freedman*, Effects of High Acidity on Phase Transitions of an Organic Aerosol, Journal of Physical Chemistry A, 122, 3819-3828 (2018).
35) S. K. Sihvonen, K. A. Murphy, N. M. Washton, M. B. Altaf, V. J. Alstadt, K. T. Mueller, M. A. Freedman*, Effect of Acid on Surface Hydroxyl Groups on Kaolinite and Montmorillonite, Zeitschrift für Physikalische Chemie, 232, 409-430 (2018).
34) M. A. Freedman*, Phase Separation in Organic Aerosol, Chemical Society Reviews, 46, 7694-7705 (2017).
33) V. J. Alstadt, J. N. Dawson, D. J. Losey, S. K. Sihvonen, M. A. Freedman*, Heterogeneous Freezing of Carbon Nanotubes: A Model System for Pore Condensation and Freezing in the Atmosphere, Journal of Physical Chemistry A, 121, 8166-8175 (2017).
32) M. B. Altaf, M. A. Freedman*, Effect of Drying Rate on Aerosol Particle Morphology, Journal of Physical Chemistry Letters, 8, 3613-3618 (2017).
31) V. J. Alstadt, J. D. Kubicki, M. A. Freedman*, Competitive Adsorption of Acetic Acid and Water on Kaolinite, Journal of Physical Chemistry A, 120, 8339-8346 (2016).
30) D. J. Losey, R. G. Parker, M. A. Freedman*, pH Dependence of Liquid-Liquid Phase Separation in Organic Aerosol, Journal of Physical Chemistry Letters, 7, 3861-3865 (2016).
29) D. P. Veghte, M. B. Altaf, J. D. Haines, M. A. Freedman*, Optical Properties of Non-Absorbing Mineral Dust Components and Mixtures, Aerosol Sci. Technol. doi:10.1080/02786826.2016.1225153 (2016).
28) M. B. Altaf, A. Zuend, M. A. Freedman*, Role of Nucleation Mechanism on the Size Dependent Morphology of Organic Aerosol, Chemical Communications, 52, 9220-9223 (2016).
27) C. A. Hasenkopf*, D. P. Veghte, G. P. Schill, S. Lodoysamba, M. A. Freedman*, M. A. Tolbert*, Ice Nucleation, Shape, and Composition of Aerosol Particles in One of the Most Polluted Cities in the World: Ulaanbaatar, Mongolia, Atmospheric Environment, 139, 222-229 (2016).
26) K. M. Primm, G. P. Schill, D. P. Veghte, M. A. Freedman, M. A. Tolbert*, Depositional ice nucleation on NX illite and mixtures of NX illite with organic acids, Journal of Atmospheric Chemistry, doi:10.1007/s10874-016-9340-x (2016).
25) M. A. Freedman*, Sites for Ice Nucleation on Aluminosilicate Clay Minerals and Related Materials, J. Phys. Chem. Lett.[Perspective], 6, 3850-3858 (2015).
24) D. P. Veghte, J. E. Moore, L. Jensen, M. A. Freedman*, Influence of shape on the optical properties of hematite aerosol, J. Geophys. Res. – Atm. 120, 7025-7039 (2015).
23) S. K. Sihvonen, G. P. Schill, N. A. Lyktey#, M. A. Tolbert, M. A. Freedman*, Chemical and Physical Transformations of Aluminosilicate Clay Minerals due to Acid Treatment and Consequences for Heterogeneous Ice Nucleation, Journal of Physical Chemistry A, 118, 8787-8796 (2014).
22) D. P. Veghte, M. A. Freedman*, Facile Method for Determining the Aspect Ratios of Mineral Dust Aerosol by Electron Microscopy, Aerosol Science and Technology, 48, 715-724 (2014).
21) D. P. Veghte, D. R. Bittner, M. A. Freedman*, Cryo-transmission electron microscopy imaging of the morphology of submicron aerosol containing organic acids and ammonium sulfate, Analytical Chemistry, 86, 2436-2442 (2014).
20) D. P. Veghte, M. B. Altaf, M. A. Freedman*, Size Dependence of the Structure of Organic Aerosol, Journal of the American Chemical Society, 135, 16046-16049 (2013).
19) K. J. Baustian, M. E. Wise, E. J. Jensen, G. P. Schill, M. A. Freedman, M. A. Tolbert*, State transformations and ice nucleation in amorphous (semi-)solid organic aerosol, Atmospheric Chemistry and Physics, 13, 5615-5628 (2013).
18) D. P. Veghte, M. A. Freedman*, The Necessity of Microscopy to Characterize the Optical Properties of Size-Selected, Nonspherical Aerosol Particles, Analytical Chemistry, 84, 9101-9108 (2012).
17) M. E. Wise, K. J. Baustian, T. Koop, M. A. Freedman, E. J. Jensen, M. A. Tolbert*, Depositional ice nucleation onto hydrated NaCl particles: a new mechanism for ice formation in the troposphere, Atmospheric Chemistry and Physics, 12, 1121-1134 (2012).
Publications from Undergraduate, Doctoral, and Postdoctoral Career
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16) R. D. Brown, Q. Tong, J. S. Becker, M. A. Freedman, N. A. Yufa, S. J. Sibener, Dynamics of Molecular and Polymeric Interfaces Probed with Atomic Beam Scattering and Scanning Probe Imaging, Faraday Discussions, 157, 307-323 (2012).
15) K. J. Zarzana, D. O. DeHaan, M. A. Freedman, C. A. Hasenkopf, M. A. Tolbert, Optical properties of oligomers formed by reactions of a-dicarbonyls and amines in simulated cloud droplets, Environmental Science and Technology, 46, 4845-4851 (2012).
14) C. A. Hasenkopf, M. A. Freedman, M. R. Beaver, O. B. Toon, M. A. Tolbert, Potential climactic impact of organic haze on the Early Earth, Astrobiology, 11, 135-149 (2011).
13) M. A. Freedman, K. J. Baustian, M. E. Wise, M. A. Tolbert, Characterizing the Morphology of Organic Aerosols at Ambient Temperature and Pressure, Analytical Chemistry, 82, 7965-7972 (2010).
12) M. R. Beaver, M. A. Freedman, C. A. Hasenkopf, M. A. Tolbert, Cooling Enhancement of Aerosol Particles due to Surfactant Precipitation, Journal of Physical Chemistry A, 114, 7070-7076 (2010).
11) C. A. Hasenkopf, M. R. Beaver, M. G. Trainer, M. A. Freedman, H. L. DeWitt, M. A. Tolbert, O. B. Toon, C. McKay, Optical Properties of Early Earth and Titan Haze Laboratory Analogs in the Mid-Visible, Icarus, 207, 903-913 (2010).
10) M. A. Freedman, C. A. Hasenkopf, M. R. Beaver, M. A. Tolbert, Optical Properties of Internally Mixed Aerosols of Dicarboxylic Acids and Ammonium Sulfate, Journal of Physical Chemistry A, 113, 13584-13592 (2009).
9) M. A. Freedman, J. S. Becker, S. J. Sibener, Effects of Film Thickness and Molecular Weight on the Interfacial Dynamics of Atactic Poly(methyl methacrylate), Journal of Physical Chemistry B, 112, 16090-16096 (2008).
8) M. A. Freedman, J. S. Becker, A. W. Rosenbaum, S. J. Sibener, Polymer Surface and Thin Film Vibrational Dynamics of Poly(methyl methacrylate), Polystyrene, and Polybutadiene, Journal of Chemical Physics, 129, 044906/1-9 (2008).
7) M. A. Freedman, A. W. Rosenbaum, S. J. Sibener, Atomic Scattering as a Probe of Polymer Surface and Thin Film Dynamics. Physical Review B, 75, 113410/1-4 (2007).
6) A. W. Rosenbaum, M. A. Freedman, S. J. Sibener, Vibrational Properties of Disordered Mono- and Bilayers of Physisorbed Sulfur Hexafluoride on Au(111), Journal of Physical Chemistry A, 110, 5537-5541 (2006).
5) A. W. Rosenbaum, M. A. Freedman, S. B. Darling, I. Popova, S. J. Sibener, Surface vibrations in alkanethiol self-assembled monolayers of varying chain length, Journal of Chemical Physics, 120, 3880-3886 (2004).
4) C. J. Fecko, M. A. Freedman, T. A. Stephenson, Collision-induced electronic energy transfer from n=0 of the E(Og+) ion-pair state in I2: Collisions with He and Ar, Journal of Chemical Physics, 116, 1361-1369 (2002).
3) C. J. Fecko, M. A. Freedman, T. A. Stephenson, Collision-induced electronic energy transfer from n=0 of the E(Og+) ion-pair state in I2: Collisions with I2(X), Journal of Chemical Physics, 115, 4132-4138 (2001).
2) R. F. Pasternack, S. Ewen, A. Rao, A. S. Meyer, M. A. Freedman, P. J. Collings, S. L. Frey, M. C. Ranen, J. C. de Paula, Interactions of Cu(II) porphyrins with DNA, Inorganica Chimica Acta, 317, 59-71 (2001).
1) M. A. Freedman, R. F. Pasternack, The effect of substrate and template rigidity on metalloporphyrin aggregation, The Chemist, 77, 25-31 (2000).