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 A portion of the research was performed using EMSL, a national scientific user facility sponsored by the DOE-BER and located at PNNL. The characterization work was funded by laboratory directed research and development funding as a part of chemical imaging initiative in PNNL..
 The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231..