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.
Non-equilibrium thermodynamic description of the coupling between structural and entropic modes in supercooled liquids / R. DILEONARDO; A. TASCHIN; M. SAMPOLI; R. TORRE; G.RUOCCO. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - STAMPA. - 67:(2003), pp. R015102-1-R015102-2. [10.1103/PhysRevE.67.015102]
Non-equilibrium thermodynamic description of the coupling between structural and entropic modes in supercooled liquids.
TASCHIN, ANDREA;SAMPOLI, MARCO;TORRE, RENATO;
2003
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.File | Dimensione | Formato | |
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