+denotes Penn State affiliation
* corresponding author if multiple PI’s
# undergraduate co-authors
2020-2024
+44) T. M. Kucinski, M. A. Freedman, Flash Freeze Flow Tube to Vitrify Aerosol Particles at Fixed Relative Humidity Values, Analytical Chemistry, accepted. doi:10.1021/acs.analchem.9b05757
+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, accepted. doi:10.1021/acsearthspacechem.0c00006
2015-2019
+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). doi:10.1021/acs.jpclett.9b02532
+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, 2019, 123, 2447-2456. Special Virtual Issue: Young Scientists. doi:10.1021/acs.jpca.8b12258
+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, 2019, 123,1275-1284. JPCA Feature Article. ACS Editors’ Choice Article. doi:10.1021/acs.jpca.8b10676
+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, 2018, 20, 1581-1592. doi:10.1039/C8EM00319J
+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, 2018, 190, 169-176. doi:10.1016/j.atmosenv.2018.07.013
+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, 2018, 2, 634-639. doi:10.1021/acsearthspacechem.7b00146
+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, 2018, 122, 3819-3828.
+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 fur Physikalische Chemie, 2018, 232, 409-430.
+34) M. A. Freedman*, Phase Separation in Organic Aerosol, Chemical Society Reviews, 2017, 46, 7694-7705. doi: 10.1039/c6cs00783j
+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, 2017, 121, 8166-8175. doi: 10.1021/acs.jpclett.7b01327
+32) M. B. Altaf, M. A. Freedman*, Effect of Drying Rate on Aerosol Particle Morphology, Journal of Physical Chemistry Letters, 2017, 8, 3613-3618. doi: 10.1021/acs.jpca.7b06359
+31) V. J. Alstadt, J. D. Kubicki, M. A. Freedman*, Competitive Adsorption of Acetic Acid and Water on Kaolinite, Journal of Physical Chemistry A, 2016, 120, 8339-8346. doi: 10.1021/acs.jpca.6b06968
+30) D. L. Losey, R. G. Parker, M. A. Freedman, pH Dependence of Liquid-Liquid Phase Separation in Organic Aerosol, Journal of Physical Chemistry Letters, 2016, 7, 3861-3865. doi:10.1021/acs.jpclett.6b01621
+29) D. P. Veghte, M. B. Altaf, M. A. Freedman, Optical Properties of Non-Absorbing Mineral Dust Components and Mixtures, Aerosol Science and Technology, 2016, accepted. doi:10.1080/02786826.2016.1225153
+28) M. B. Altaf, A. Zuend, M. A. Freedman*, Role of Nucleation Mechanism on the Size Dependent Morphology of Organic Aerosol, Chemical Communications, 2016, 52, 9220-9223. doi:10.1039/C6CC03826C
+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, 2016, 139, 222-229. doi:10.1016/j.atmosenv.2016.05.037
+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, 2016, doi:10.1007/s10874-016-9340-x
+25) M. A. Freedman, Sites for Ice Nucleation on Aluminosilicate Clay Minerals and Related Materials, Journal of Physical Chemistry Letters, 2015, 6, 3850-3858. doi:10.1021/acs.jpclett.5b01326
+24) D. P. Veghte, J. E. Moore, L. Jensen, M. A. Freedman*, Influence of shape on the optical properties of hematite aerosol, Journal of Geophysical Research – Atmospheres, 2015, 120, 7025-7039. doi:10.1002/2015JD023160
2010-2014
+23) S. K. Sihvonen, G. P. Schill, N. A. Lyktey#, D. P. Veghte, 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, 2014, 118, 8787-8796. doi:10.1021/jp504846g
+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, 2014, 48, 715-724. doi:10.1080/02786826.2014.920484
+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, 2014, 86, 2436-2442. doi: 10.1021/ac403279f
+20) D. P. Veghte, M. B. Altaf, M. A. Freedman, Size Dependence of the Structure of Organic Aerosol, Journal of the American Chemical Society, 2013, 135: 16046-16049. doi:10.1021/ja408903g
+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, 2013, 13, 5615-5628. doi:10.5194/acp-13-5615-2013
+18) D. P. Veghte, M. A. Freedman, The Necessity of Microscopy to Characterize the Optical Properties of Size-Selected, Nonspherical Aerosol Particles, Analytical Chemistry, 2012, 84, 9101-9108. doi:10.1021/ac3017373
17) 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, 2012, 157, 307-323. doi:10.1039/c2fd20016c
16) K. J. Zarzana, D. O. De Haan, M. A. Freedman, C. A. Hasenkopf, M. A. Tolbert, Optical properties of oligomers formed by reactions of α-dicarbonyls and amines in simulated cloud droplets, Environmental Science and Technology, 2012, 46, 4845-4851. doi:10.1021/es2040152
+15) 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, 2012, 12, 1121-1134. doi:10.5194/acp-12-1121-2012
14) C. A. Hasenkopf, M. A. Freedman, M. R. Beaver, O. B. Toon, M. A. Tolbert, Potential Climatic Impact of Organic Haze on Early Earth, Astrobiology, 2011, 11, 135-149. doi:10.1089/ast.2010.0541
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, 2010, 82, 7965-7972. doi: 10.1021/ac101437w
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, 2010, 114, 7070-7076. doi: 10.1021/jp102437q
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, 2010, 207, 903-913. doi: 10.1016/j.icarus.2009.12.015
2005-2009
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, 2009, 113, 13584-13592. doi: 10.1021/jp906240y
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, 2008, 112, 16090-16096. doi: 10.1021/jp8062614
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, 2008, 129, 044906. doi: 10.1063/1.2939018
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, 2007, 75, 113410. doi: 10.1103/PhysRevB.75.113410
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 2006, 110, 5537-5541. doi: 10.1021/jp0567772
2000-2004
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 2004, 120, 3880-3886. doi: 10.1063/1.1643353
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 2002, 116, 1361-1369. link to article
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 2001, 115, 4132-4138. link to article
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 Chemica Acta 2001, 317, 59-71. doi:10.1016/S0020-1693(01)00340-1
1) M. A. Freedman, R. F. Pasternack, The effect of substrate and template rigidity on metalloporphyrin aggregation, The Chemist 2000, 77, 25-31.