Nonequilibrium thermodynamic description of the coupling between structural and entropic modes in supercooled liquids
Year: 2003
Authors: Di Leonardo R., Taschin A., Sampoli M., Torre R., Ruocco G.
Autors Affiliation: 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.
Journal/Review: PHYSICAL REVIEW E
Volume: 67 (1) Pages from: 15102-1 to: 15102-4
KeyWords: Glass-forming Liquids; Light-scattering; Relaxation; Glycerol; Dynamics; FluidDOI: 10.1103/PhysRevE.67.015102Citations: 11data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-17References taken from IsiWeb of Knowledge: (subscribers only)