[1] Univ Illinois, Beckman Inst Adv Sci & Technol, Dept Chem, Roger Adams Lab, Urbana, IL 61801 USA
[2] Univ Illinois, Beckman Inst Adv Sci & Technol, Dept Mat Sci & Engn, Roger Adams Lab, Urbana, IL 61801 USA
[3] 3M Co, 3M Adhes Technol Ctr, St Paul, MN 55144 USA
[4] Macalester Coll, Dept Chem, St Paul, MN 55105 USA