1. Department of Chemistry and the Polymer Program, Institute of Materials Science, University of Connecticut, 97 N. Eagleville Rd., Storrs, Connecticut 06269
2. Kraft Foods R&D, The Nanotechnology Lab, 801 Waukegan Rd, Glenview, Illinois 60025, and Los Alamos National Laboratory, Chemical Science & Technology Division, Los Alamos, New Mexico 87545