1. Department of Biomedical Engineering, Cornell University, Ithaca, New York 14853, United States
2. Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
3. Department of Chemistry, Cornell University, Ithaca, New York 14853, United States
4. Department of Chemical Engineering, Monash University, Clayton, Victoria 3150, Australia
5. Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States