Relaxation times tau(T,v) for different temperatures, T, and specific volumes, v, collapse to a master curve vs Tu(gamma), with gamma a material constant. The isochoric fragility, m(V), is also a material constant, inversely correlated with gamma. From these experimental facts, we obtain a three-parameter function that accurately fits tau(T,v) data for several glass-formers over the supercooled regime, without any divergence of tau below T(g). Although the values of the three parameters depend on the material, only gamma significantly varies; thus, by normalizing material-specific quantities related to gamma, a universal power law for the dynamics is obtained.
|Autori:||Casalini, R.; Capaccioli, Simone; Roland, C. M.|
|Titolo:||What can we learn by squeezing a liquid?|
|Anno del prodotto:||2006|
|Digital Object Identifier (DOI):||10.1021/jp062356o|
|Appare nelle tipologie:||1.1 Articolo in rivista|