Hee Jeung Oh¹, Mariam Aboian², Michael Yi³, Jacqueline Maslyn^3,4, Whitney Loo³, Xi Jiang⁴, Dilworth Parkinson⁵, Mark Wilson⁶, Terilyn Moore⁶, Colin Yee⁷, Gregory Robbins⁸, Florian Barth⁸, Joseph M DeSimone^9,10,11, Steven W. Hetts¹² and Nitash P. Balsara^1,4,13, (1)Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA, (2)Department of Radiology, University of California, San Francisco, San Fancisco, CA, (3)Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA, (4)Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, (5)Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, CA, (6)Department of Radiology, University of California, San Francisco, California, San Francisco, CA, (7)epartment of Radiology, University of California, San Francisco, California, San Francisco, CA, (8)Carbon, Inc., Carbon, Inc., Redwood City, CA, (9)Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, (10)Carbon, Redwood City, CA, (11)Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, (12)Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA, (13)Chemical and Biomolecular Engineering, University of California, Berkeley, CA