http://www.cnr.it/ontology/cnr/individuo/prodotto/ID2976

Dynamically correlated regions and configurational entropy in supercooled liquids (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Dynamically correlated regions and configurational entropy in supercooled liquids (Articolo in rivista) (literal)

Anno

2008-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1021/jp802097u (literal)

Alternative label

Capaccioli, S; Ruocco, G; Zamponi, F (2008)
Dynamically correlated regions and configurational entropy in supercooled liquids
in The journal of physical chemistry. B; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Capaccioli, S; Ruocco, G; Zamponi, F (literal)

Pagina inizio

10652 (literal)

Pagina fine

10658 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

112 (literal)

Rivista

?The ?journal of physical chemistry. B (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

7 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

34 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

\"[Zamponi, Francesco] Univ Roma La Sapienza, CNR INFM CRS Soft, Dipartimento Fis, I-00185 Rome, Italy; [Capaccioli, Simone] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; [Zamponi, Francesco] DSM CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France; [Zamponi, Francesco] Ecole Normale Super, Phys Theor Lab, F-75231 Paris 05, France (literal)

Titolo

Dynamically correlated regions and configurational entropy in supercooled liquids (literal)

Abstract

When a liquid is cooled below its melting temperature. if crystallization is avoided, it forms a glass. This phenomenon, called glass transition, is characterized by a marked increase of viscosity, about 14 orders of magnitude, in a narrow temperature interval. The microscopic mechanism behind the glass transition is still poorly understood. However, recently, great advances have been made in the identification of cooperative rearranging regions. or dynamical heterogeneities, i.e., domains of the liquid whose relaxation is highly correlated. The growth of the size of these domains is now believed to be the driving mechanism for the increase of the viscosity. Recently a tool to quantify the size of these domains has been proposed. We apply this tool to a wide class of materials to investigate the correlation between the size of the heterogeneities and their configurational entropy, i.e., the number of states accessible to a correlated domain. We find that the relaxation time of a given system, apart from a material dependent prefactor, is a universal function of the configurational entropy of a correlated domain. As a consequence, we find that, at the class transition temperature, the size of the domains and the configurational entropy per unit volume are anticorrelated, as originally predicted by the Adam-Gibbs theory. Finally, we use our data to extract some exponents defined in the framework of the random first-order theory, a recent quantitative theory of the glass transition. (literal)

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