1. DuPont Nanocomposite Technologies and DuPont Central Corporate Analytical Services, Central Research & Development, E.I. DuPont de Nemours & Co., Inc., Wilmington, Delaware 19880, United States
2. DND-CAT Synchrotron Research Center, Northwestern University, APS/ANL Building 432-A004, 9700 South Cass Avenue, Argonne, Illinois 60439, United States