1. Department of Chemistry and Biochemistry, University of Mississippi, 322 Coulter Hall, University, Mississippi 38677, United States
2. Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, Mississippi 39217, United States
3. Materials and Manufacturing Directorate, Air Force Research Laboratory, 2230 Tenth Street, Wright-Patterson AFB, Ohio 45433, United States
4. UES Inc., 4401 Dayton-Xenia Road, Dayton, Ohio 45432, United States