1. Center for Information and Communication Materials, Department of Chemical Engineering, Hanyang University, Seoul 133-791, South Korea, Department of Frontier Materials and Functional Engineering, Graduate School of Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan, and Chemical Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439