http://www.cnr.it/ontology/cnr/individuo/prodotto/ID282718
Glass-glass transition during aging of a colloidal clay. (Articolo in rivista)
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- Label
- Glass-glass transition during aging of a colloidal clay. (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1038/ncomms5049 (literal)
- Alternative label
Roberta Angelini (1,2); Emanuela Zaccarelli (2,3); Flavio Augusto de Melo Marques (4); Michael Sztucki (5); Andrei Fluerasu (6); Giancarlo Ruocco (2,4); Barbara Ruzicka (1,2) (2014)
Glass-glass transition during aging of a colloidal clay.
in Nature communications
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Roberta Angelini (1,2); Emanuela Zaccarelli (2,3); Flavio Augusto de Melo Marques (4); Michael Sztucki (5); Andrei Fluerasu (6); Giancarlo Ruocco (2,4); Barbara Ruzicka (1,2) (literal)
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- http://www.nature.com/ncomms/2014/140602/ncomms5049/full/ncomms5049.html#affil-auth (literal)
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- (1) IPCF-CNR, UOS Roma, P.le Aldo Moro 2, I-00185 Roma, Italy
(2) Dipartimento di Fisica, Sapienza Università di Roma, P.le Aldo Moro 2, I-00185 Roma, Italy
(3) ISC-CNR, UOS Sapienza, P.le Aldo Moro 2, I-00185 Roma, Italy
(4) Center for Life NanoScience, IIT@Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00161 Roma, Italy
(5) ESRF-The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
(6) Brookhaven National Laboratory, NSLS-II, Upton, New York 11973, USA (literal)
- Titolo
- Glass-glass transition during aging of a colloidal clay. (literal)
- Abstract
- Colloidal suspensions are characterized by a variety of microscopic interactions, which generate unconventional phase diagrams encompassing fluid, gel and glassy states and offer the possibility to study new phase and/or state transitions. Among these, glass-glass transitions are rare to be found, especially at ambient conditions. Here, through a combination of dilution experiments, X-ray photon correlation spectroscopy, small angle X-ray scattering, rheological measurements and Monte Carlo simulations, we provide evidence of a spontaneous glass-glass transition in a colloidal clay. Two different glassy states are distinguished with evolving waiting time: a first one, dominated by long-range screened Coulombic repulsion (Wigner glass) and a second one, stabilized by orientational attractions (Disconnected House of Cards glass), occurring after a much longer time. These findings may have implications for heterogeneously charged systems out-of-equilibrium and for applications where a fine control of the local order and/or long term stability of the amorphous materials are required. (literal)
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