Colloidal glasses and gels: The interplay of bonding and caging (Articolo in rivista)

Type
Label
  • Colloidal glasses and gels: The interplay of bonding and caging (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1073/pnas.0902294106 (literal)
Alternative label
  • Emanuela Zaccarelli; Wilson C. K. Poon (2009)
    Colloidal glasses and gels: The interplay of bonding and caging
    in Proceedings of the National Academy of Sciences of the United States of America
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Emanuela Zaccarelli; Wilson C. K. Poon (literal)
Pagina inizio
  • 15203 (literal)
Pagina fine
  • 15208 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 106 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Fisica and Consiglio Nazionale delle Ricerche-Istituto Nazionale per la Fisica della Materia-Soft: Complex Dynamics in Structured Systems, Universita` di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy; Scottish Universities Physics Alliance (SUPA), and School of Physics and Astronomy, University of Edinburgh, Kings Buildings, Mayfield Road, Edinburgh EH9 3JZ, Scotland, United Kingdom (literal)
Titolo
  • Colloidal glasses and gels: The interplay of bonding and caging (literal)
Abstract
  • We report simulations of glassy arrest in hard-core particles with short-range interparticle attraction. Previous experiments, theory, and simulations suggest that in this kind of system, two qualita- tively distinct kinds of glasses exist, dominated respectively by repulsion and attraction. It is thought that in the former, particles are trapped ''topologically,'' by nearest-neighbor cages, whereas in the latter, nonergodicity is due to interparticle ''bonds.'' Subse- quent experiments and simulations have suggested that bond breaking destabilizes attractive glasses, but the long-term fate of these arrested states remains unknown. By running simulations to times a few orders of magnitude longer than those reached by previous experiments or simulations, we show that arrest in an attractive glass is, in the long run, also topological. Nevertheless, it is still possible to distinguish between ''nonbonded'' and ''bonded'' repulsive glassy states. We study the melting of bonded repulsive glasses into a hitherto unknown ''dense gel'' state, which is distinct from dense, ergodic fluids. We propose a ''modified state diagram'' for concentrated attractive particles, and discuss the relevance of our results in the light of recent rheological measure- ments in colloid-polymer mixtures. (literal)
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