1. School of Polymer Science and Polymer Engineering, The University of Akron, 170 University Ave, Akron, Ohio 44325, United States
2. Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy St, Newark, Delaware 19716, United States
3. Evolution and Optics of Nanostructures Group, Department of Biology, Ghent University, Ledeganckstraat 35, Ghent 9000, Belgium
4. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
5. X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
6. Department of Materials Science and Engineering, Department of Biomedical Engineering, Department of Pharmacology, International Institute of Nanotechnology, Simpson-Querrey Institute, Chemistry of Life Processes Institute, Lurie Cancer Center, Northwestern University, Evanston, Illinois 60208, United States
7. Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
8. Department of Materials Science and Engineering, University of Delaware, 201 DuPont Hall, Newark, Delaware 19716, United States