[1] Politecn Milan, Dept Energy, Via Lambruschini 4, I-20156 Milan, Italy
[2] German Aerosp Ctr DLR, Inst Engn Thermodynam, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
[3] Univ Connecticut, Ctr Clean Energy Engn, 44 Weaver Rd,Unit 5233, Storrs, CT 06269 USA
[4] Univ Connecticut, Dept Chem & Biomol Engn, 191 Auditorium Rd,Unit 3222, Storrs, CT 06269 USA
[5] Univ Connecticut, Dept Mat Sci & Engn, 97 North Eagleville Rd, Storrs, CT 06269 USA
[6] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA