1. Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14850, United States
2. Metabolomics Facility, Institute of Biotechnology, Cornell University, Ithaca, New York 14850, United States
3. Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York 14850, United States
4. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
5. Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14850, United States