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ACKNOWLEDGEMENTS
Portions of this work were performed at the Advanced Photon Source (APS) Sector 12-ID-B, Argonne National Laboratory. Use of the APS was supported by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences. We acknowledge the National Science Foundation Engineering Research Center for Structured Organic Particulate Systems (EEC-0540855) for financial support. S.J.T. and G.J.S. gratefully acknowledge additional support from NIHR01GM103401. The authors thank Ryan D. Muir for his assistance with data analysis.
