Nonequilibrium thermodynamic description of the coupling between structural and entropic modes in supercooled liquids
Anno: 2003
Autori: Di Leonardo R., Taschin A., Sampoli M., Torre R., Ruocco G.
Affiliazione autori: Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Univ Roma La Sapienza, INFM, I-00185 Rome, Italy; Univ Florence, INFM, I-50019 Florence, Italy; Univ Florence, LENS, Dipartimento Fis, I-50019 Florence, Italy; Univ Florence, Dipartimento Energet, Florence, Italy.
Abstract: The density response of supercooled glycerol to an impulsive stimulated thermal grating (q=0.63 mum(-1)) has been studied in the temperature range (T=200-340 K) where the structure rearrangement (alpha relaxation) and the thermal diffusion occur on the same time scale. A strong interaction between the two modes occurs giving rise to a dip in the T dependence of the apparent thermal conductivity and a flattening of the apparent alpha-relaxation time upon cooling. A nonequilibrium thermodynamic model for the long time response has been developed. The model is capable to reproduce the experimental data and to explain the observed phenomenology.
Giornale/Rivista: PHYSICAL REVIEW E
Volume: 67 (1) Da Pagina: 15102-1 A: 15102-4
Parole chiavi: Glass-forming Liquids; Light-scattering; Relaxation; Glycerol; Dynamics; FluidDOI: 10.1103/PhysRevE.67.015102Citazioni: 11dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-06-15Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)
