https://doi.org/10.1140/epje/i2011-11094-7
Regular Article
The role of the dynamic crossover temperature and the arrest in glass-forming fluids
1
Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA
2
Center for Polymer Studies and Department of Physics, Boston University, 02215, Boston, MA, USA
3
Dipartimento di Fisica and CNISM, Università di Messina, I-98166, Messina, Italy
4
Fondazione Fulvio Frisone, Via Etnea, Catania, Italy
* e-mail: francesco.mallamace@unime.it
Received:
2
May
2011
Accepted:
4
July
2011
Published online:
23
September
2011
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 τ and the viscosity η, 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.
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011
