1. Chemistry and Biochemistry Department, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
2. University of California Center for Environmental Implications of Nanotechnology, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
3. Environmental Science and Engineering Ph.D. Program, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States