Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses (Articolo in rivista)

Type
Label
  • Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.2772628 (literal)
Alternative label
  • Antonio M. Puertas (1); Cristiano De Michele (2); Francesco Sciortino (2); Piero Tartaglia (2); Emanuela Zaccarelli (2) (2007)
    Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses
    in The Journal of chemical physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Antonio M. Puertas (1); Cristiano De Michele (2); Francesco Sciortino (2); Piero Tartaglia (2); Emanuela Zaccarelli (2) (literal)
Pagina inizio
  • 144906 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://scitation.aip.org/content/aip/journal/jcp/127/14/10.1063/1.2772628 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 127 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
  • PubMe (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) Group of Complex Fluid Physics, Departamento de Física Aplicada, Universidad de Almería, 04120 Almeria, Andalucía, Spain (2) Dipartimento di Fisica, Instituto Nazionale per la Fisica della Materia, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Roma, Italy and CNR-INFM-SOFT, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Roma, Italy (literal)
Titolo
  • Viscoelasticity and Stokes-Einstein relation in repulsive and attractive colloidal glasses (literal)
Abstract
  • We report a numerical investigation of the viscoelastic behavior in models for steric repulsive and short-ranged attractive colloidal suspensions, along different paths in the attraction strength vs packing fraction plane. More specifically, we study the behavior of the viscosity (and its frequency dependence) on approaching the repulsive glass, the attractive glass, and in the reentrant region where viscosity shows a nonmonotonic behavior on increasing attraction strength. On approaching the glass lines, the increase of the viscosity is consistent with a power-law divergence with the same exponent and critical packing fraction previously obtained for the divergence of the density fluctuations. Based on mode-coupling calculations, we associate the increase of the viscosity with specific contributions from different length scales. We also show that the results are independent of the microscopic dynamics by comparing Newtonian and Brownian simulations for the same model. Finally, we evaluate the Stokes-Einstein relation approaching both glass transitions, finding a clear breakdown which is particularly strong for the case of the attractive glass. (C) 2007 American Institute of Physics. (literal)
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