1. Department of Chemical Engineering, Chemistry, and Materials Science, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201; National Institute of Standards and Technology, Building 235, E 151, Gaithersburg, Maryland 20899; Department of Chemical Engineering, University of Houston, 4800 Calhoun, Houston, Texas 77204; and Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802