Thermally activated processes in polymer dynamics
Anno: 2003
Autori: Bongini L., Livi R., Politi A., Torcini A.
Affiliazione autori: Istituto Nazionale di Fisica della Materia, UdR Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino (FI), Italy;
Dipartimento di Fisica, Università di Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino (FI), Italy;
Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy
Abstract: Jumps between neighboring minima in the energy landscape of both homopolymeric and heteropolymeric chains are numerically investigated by determining the average escape time from
different valleys. The numerical results are compared to the theoretical expression derived by Langer [J.S. Langer, Ann. Phys. (N.Y.) 54, 258 (1969)] with reference to a 2N-dimensional space. Our simulations indicate that the dynamics within the native valley is well described by a sequence of thermally activated process up to temperatures well above the folding temperature. At larger temperatures, systematic deviations from the Langer’s estimate are instead observed. Several sources for such discrepancies are thoroughly discussed.
Giornale/Rivista: PHYSICAL REVIEW E
Volume: 68 (6) Da Pagina: 061111-1 A: 061111-12
Parole chiavi: LONG-TIME DYNAMICS; OFF-LATTICE MODEL; ENERGY LANDSCAPES; TEMPERATURE; GLASSCitazioni: 12dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)