We discuss the role of the dynamic glass-forming fragile-to-strong crossover (FSC) in supercooled liquids. In the FSC, significant dynamic changes such as the decoupling (the violation of the Stokes-Einstein relation) of homologous transport parameters, e. g., the density relaxation time tau and the viscosity eta, occur at a characteristic temperature T-c. We study the FSC using a scaling law approach. In particular, we use both forms of the mode-coupling theory (MCT): the original (ideal) and the extended form, which explicitly describes energy hopping processes. We demonstrate that T-c plays the most important physical role in understanding dynamic arrest processes.
The role of the dynamic crossover temperature and the arrest in glass-forming fluids
MALLAMACE, Francesco;CORSARO, CARMELO;
2011-01-01
Abstract
We discuss the role of the dynamic glass-forming fragile-to-strong crossover (FSC) in supercooled liquids. In the FSC, significant dynamic changes such as the decoupling (the violation of the Stokes-Einstein relation) of homologous transport parameters, e. g., the density relaxation time tau and the viscosity eta, occur at a characteristic temperature T-c. We study the FSC using a scaling law approach. In particular, we use both forms of the mode-coupling theory (MCT): the original (ideal) and the extended form, which explicitly describes energy hopping processes. We demonstrate that T-c plays the most important physical role in understanding dynamic arrest processes.Pubblicazioni consigliate
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