Professional Preparation:

Professional Appointments

Assistant Professor, Chemistry, UMN, 2001-present
Graduate Faculty, Geology and Geophysics, UMN, 2001-present
Graduate Faculty, Water Resources Science, UMN, 2001-present
Adjunct Faculty, Chemistry, Towson University, 1999-2000

Selected Publications

"Influence of Aluminum Substitution on the Reactivity of Magnetite Nanoparticles." Teresa Jentzsch, Chan Lan Chun, Rachel S. Gabor, and R.L. Penn (in press), Journal of Physical Chemistry C.

"Influence of Aluminum Doping on Ferrihydrite Nanoparticle Reactivity." Teresa Jentzsch and R.L. Penn (2006) Journal of Physical Chemistry B, 110, 11746-11750.

"High Crystallinity Si-Ferrihydrite: An Insight into its Néel Temperature and Size Dependence of Magnetic properties." Thelma S. Berquó, Subir K. Banerjee, Robert Ford, and R.L. Penn (2007) Journal of Geophysical Research, 112, B02102, doi:10.1029/2006JB004583.

"Controlled growth of alpha-FeOOH nanorods by exploiting oriented aggregation." D. Gulliver*, J. Erbs, R.L. Penn (2006) Journal of Crystal Growth, 293, 1-4.

"Kinetic and Microscopic Studies of Reductive Transformations of Organic Contaminants on Goethite." C. L. Chun, R.L. Penn, and W.A. Arnold (2006), Environmental Science and Technology, 40, 3299-3304.

"Magnetic Properties of Synthetic Six-Line Ferrihydrite Nanoparticles." Y. Guyodo, S. K. Banerjee, R.L. Penn, D. J. Burleson, T.S. Berquo, T. Seda, and P. Solheid (2006), Physics of the Earth and Planetary Interior special issue on "Developments in Techniques and Methods Related to Rock Magnetism," 154: 222-233.

"Mechanistic Principles of Nanoparticle Evolution to Zeolite Crystals." T.M. Davis, T.O. Drews, H. Ramanan, C. He, H. Schnablegger, M.A. Katsoulakis, E. Kokkoli, R.L. Penn, and M. Tsapatsis (2006), Nature Materials, 5, 400-408.

"Building a Successful Middle School Outreach Effort: Microscopy Camp 2005." R.L. Penn, L. Flynn, and P. Johnson. Journal of Chemical Education (accepted July 2006).

"Relative Brookite and Anatase Content in Sol-Gel Synthesized Titanium Dioxide Nanoparticles." Sara Isley and R.L. Penn (2006), Journal of Physical Chemistry B, 110, 15134-15139.

"Two-Step Growth of Goethite from Ferrihydrite." D. J. Burleson and R.L. Penn (2006), Langmuir; 22, 402-409.