Journal article

Investigation of q-dependent dynamical heterogeneity in a colloidal gel by x-ray photon correlation spectroscopy

  • Trappe, Véronique Departement de Physique, Université de Fribourg, Switzerland
  • Pitard, E. Laboratoire des Colloïdes, Verres et Nanomatériaux Université Montpellier, France
  • Ramos, L. Laboratoire des Colloïdes, Verres et Nanomatériaux Université Montpellier, France
  • Robert, A. European Synchrotron Radiation Facility, Grenoble, France
  • Bissig, Hugo Departement de Physique, Université de Fribourg, Switzerland
  • Cipelletti, Luca Laboratoire des Colloïdes, Verres et Nanomatériaux Université Montpellier, France
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    15.11.2007
Published in:
  • Physical Review E. - 2007, vol. 76, p. 051404
English We use time-resolved x-ray photon correlation spectroscopy to investigate the slow dynamics of colloidal gels made of moderately attractive carbon black particles. We show that the slow dynamics is temporally heterogeneous and quantify its fluctuations by measuring the variance ϰ of the instantaneous intensity correlation function. The amplitude of dynamical fluctuations has a nonmonotonic dependence on scattering vector q, in stark contrast with recent experiments on strongly attractive colloidal gels [Duri and Cipelletti, Europhys. Lett. 76, 972 (2006)]. We propose a simple scaling argument for the q-dependence of fluctuations in glassy systems that rationalizes these findings.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/300827
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