[1] Cent Supelec, CNRS, Combust, Lab Energet Mol & Macroscop, Grande Voie Vignes, F-92295 Chatenay Malabry, France
[2] VTT Tech Res Ctr Finland, POB 1000, Espoo 02044, Finland
[3] Univ Maine, UMR CNRS 6283, Inst Mol & Mat Mans, F-72085 Le Mans, France
[4] Univ Maine, UMR CNRS 6613, Acoust Lab, F-72085 Le Mans, France
[5] Univ Konstanz, Dept Phys, Univ Str 10, D-78457 Constance, Germany
[6] CSIC, Catalan Inst Nanosci & Nanotechnol ICN2, Campus UAB, Barcelona 08193, Spain
[7] Barcelona Inst Sci & Technol, Campus UAB, Barcelona 08193, Spain
[8] Catalan Inst Res & Adv Studies, ICREA, Barcelona 08010, Spain
[9] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany
[10] Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80309 USA
[11] Univ Calif Davis, Dept Chem, One Shields Ave, Davis, CA 95616 USA
[12] Basque Fdn Sci, Ikerbasque, Bilbao, Spain
[13] Donostia Int Phys Ctr, Paseo M de Lardizabal 4, San Sebastian 20018, Spain
[14] Johannes Gutenberg Univ Mainz, Inst Phys, Staudinger Weg 7, D-55128 Mainz, Germany