1. Department of Chemistry; University of Idaho; Moscow ID 83844 USA
2. Department of Materials Science and Engineering and Beckman Institute; University of Illinois Urbana-Champaign; Urbana IL 61801 USA
3. Department of Chemical and Biomolecular Engineering; Seoul National University of Science and Technology; 232 Gongneung-ro Nowon-gu Seoul 139-743 Korea
4. 3M Company; 3M Center St. Paul MN 55144 USA