Postdoctoral Fellows
Amanda L. Mifflin
Chongzheng Na
John Shilling
Marcelo Guzman
Yuanzhi Tang
Thomas Rosenoern

Graduate Students
Stephanie King
Qi Chen
Mackenzie Smith

Undergraduates
 

Alumni
Undergraduates
Graduate Students
Postdoctoral Associates
Visitors
Research Technicians

Former Graduate Students

1. J. Holly Chelf, MS student (5/1/98 - 5/1/00, University of North Carolina at Chapel Hill)

2. Jeong-Ho Han, Ph.D. student (1/1/97 - 12/6/00, University of North Carolina at Chapel Hill)

Ph.D. thesis title: "Phase Transitions of Aqueous Atmospheric Particles: Crystallization of Ammonium Salts Promoted by Oxide Mineral Inclusions."

3. Juyoung Ha, MS graduate from the Harvard School of Public Health

She worked in group from May 2001 to April 2002. She began her PhD studies at Stanford University in September 2002.

4. Owen Duckworth, MS and Ph.D. student (9/1/97 - 10/1/03).

MS thesis title (Chapel Hill): "Ligand-Promoted Dissolution of Hematite: Relationships between Surface Complexation Structures and Dissolution Rate Constants."

Ph.D. thesis title (Harvard): "Macroscopic and Microscopic Perspectives on Dissolution of Carbonate Minerals."

He earned a BS degree in Chemistry/Geology at William and Mary, Virginia. He received EPA STAR and Sandia Campus Executive Program fellowships. In his doctoral dissertation (1997-2003), Owen Duckworth utilized atomic force microscopy (AFM) and atomistic simulations to examine the dissolution of an isostructural series of calcite family carbonate minerals. He discovered that dissolution rates derived from microtopographic changes observed directly in AFM images quantitatively agreed with rates derived from a traditional flow-through reactor. Additionally, the dissolution rates of the minerals correlated with calculated energetic parameters. These studies provided critical insights into the fundamental molecular mechanisms of mineral dissolution, allowing for a deeper understanding of a ubiquitous heterogeneous environmental chemical process. Now an assistant professor at North Carolina State University. (http://www.soil.ncsu.edu/people/detail.php?who=958)

5. Young-Shin Jun, Ph.D. student (7/1/00 - 8/31/05).

Ph.D. thesis title: "Microscopic Mechanisms of Dissolution and Precipitation of Manganese Minerals."

She earned BS and MS degrees in Environmental Science and Engineering from Ewha Womans University (Seoul, Korea). As a Ph.D. student (2000¨C2005) at Harvard, Young-Shin Jun demonstrated how organic compounds, oxygen molecules, and foreign metal ions can alter the mechanisms and kinetics of dissolution and precipitation of manganese minerals. In situ microscopic observations using atomic force microscope (AFM), coupled with macroscopic quantitative measurements (using graphite-furnace atomic-absorption spectroscopy), enabled her to resolve discrepancies between field- and laboratory-based measurements. The findings from this work showed that dissolution of manganese carbonates occurred simultaneously with precipitation of manganese oxide under oxic aqueous conditions. She also found that heteroepitaxial nucleation and growth of manganese oxide islands on surfaces were controlled by substrate surface morphology, the substrate atomic structure, the Mn2+(aq) concentration, and foreign metal ions. Her work has provided important advancements toward answering several enduring, fundamental questions in environmental chemistry: How can reaction kinetics at larger scales be improved with a molecular understanding of interfacial reactions? What are the mechanisms of the various dynamic interfacial reactions that occur in aqueous systems at the molecular level? How are the structures and reactivities of nanoparticles under various conditions different from those at bulk surfaces? Now she is an assistant professor at Washington University.
(http://eec.wustl.edu/About/People.asp?PersonID=3063&Org=EEC)

6. Julie Schlenker, Ph.D. student (6/15/01 - 8/31/06).

Ph.D. thesis title: "Crystallization of Aqueous Sulfate-Nitrate-Ammonium-Proton Aerosol Particles."

Julie worked 1/1/99 - 7/1/00 at Chapel Hill (chemistry undergraduate). She returned to the research group on 6/15/01 as a Ph.D. student at Harvard.