Gel to glass transition in simulation of a valence-limited colloidal system (Articolo in rivista)

Type
Label
  • Gel to glass transition in simulation of a valence-limited colloidal system (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.2177241 (literal)
Alternative label
  • E. Zaccarelli (1); I. Saika-Voivod (2); S.V. Buldyrev (3); A.J. Moreno (4); P. Tartaglia (5); F. Sciortino (5) (2006)
    Gel to glass transition in simulation of a valence-limited colloidal system
    in The Journal of chemical physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E. Zaccarelli (1); I. Saika-Voivod (2); S.V. Buldyrev (3); A.J. Moreno (4); P. Tartaglia (5); F. Sciortino (5) (literal)
Pagina inizio
  • 124908 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://scitation.aip.org/content/aip/journal/jcp/124/12/10.1063/1.2177241 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 124 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
  • PubMe (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Dipartimento di Fisica and CNR-INFM-SOFT, Universitá di Roma 'La Sapienza,' Piazzale Aldo Moro 2, I-00185, Roma, Italy and ISC-CNR, Via dei Taurini 19, I-00185, Roma, Italy (2) Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5C9, Canada and Dipartimento di Fisica, Università di Roma 'La Sapienza,' Piazzale Aldo Moro 2, I-00185, Roma, Italy (3) Department of Physics, Yeshiva University, 500 W 185th Street New York, New York 10033 (4) Dipartimento di Fisica and CNR-INFM-SMC, Università di Roma 'La Sapienza,' Piazzale Aldo Moro 2, I-00185, Roma, Italy and Donostia International Physics Center, Paseo Manuel de Lardizabal 4, E-20018 San Sebastián, Spain (5) Dipartimento di Fisica and CNR-INFM-SMC, Università di Roma 'La Sapienza,' Piazzale Aldo Moro 2, I-00185, Roma, Italy (literal)
Titolo
  • Gel to glass transition in simulation of a valence-limited colloidal system (literal)
Abstract
  • We numerically study a simple model for thermoreversible colloidal gelation in which particles can form reversible bonds with a predefined maximum number of neighbors. We focus on three and four maximally coordinated particles, since in these two cases the low valency makes it possible to probe, in equilibrium, slow dynamics down to very low temperatures T. By studying a large region of T and packing fraction phi we are able to estimate both the location of the liquid-gas phase separation spinodal and the locus of dynamic arrest, where the system is trapped in a disordered nonergodic state. We find that there are two distinct arrest lines for the system: a glass line at high packing fraction, and a gel line at low phi and T. The former is rather vertical (phi controlled), while the latter is rather horizontal (T controlled) in the phi-T plane. Dynamics on approaching the glass line along isotherms exhibit a power-law dependence on phi, while dynamics along isochores follow an activated (Arrhenius) dependence. The gel has clearly distinct properties from those of both a repulsive and an attractive glass. A gel to glass crossover occurs in a fairly narrow range in phi along low-T isotherms, seen most strikingly in the behavior of the nonergodicity factor. Interestingly, we detect the presence of anomalous dynamics, such as subdiffusive behavior for the mean squared displacement and logarithmic decay for the density correlation functions in the region where the gel dynamics interferes with the glass dynamics. (c) 2006 American Institute of Physics. (literal)
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