[1] Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA
[2] Univ Connecticut, Dept Mat Sci & Engn, Storrs, CT 06269 USA
[3] Univ Connecticut, Dept Chem, Storrs Mansfield, CT 06269 USA
[4] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA
[5] Schlumberger Carbon Serv, Pittsburgh, PA 15275 USA