%0 Journal Article
%T Investigation of $q$-dependent dynamical heterogeneity in a colloidal gel by x-ray photon correlation spectroscopy
%+ Physics Department (FRIBPHYS)
%+ Laboratoire des colloïdes, verres et nanomatériaux (LCVN)
%+ European Synchrotron Radiation Facility (ESRF)
%A Trappe, Veronique
%A Pitard, Estelle
%A Ramos, Laurence
%A Robert, Aymeric
%A Bissig, Hugo
%A Cipelletti, Luca
%Z Final version published in PRE
%< avec comité de lecture
%@ 1539-3755
%J Physical Review E : Statistical, Nonlinear, and Soft Matter Physics
%I American Physical Society
%V 76
%N 5
%P 051404
%8 2007-11-15
%D 2007
%Z cond-mat/0702646
%R 10.1103/PhysRevE.76.051404
%K glasses
%K gels
%K X-photon correlation spectroscopy
%K dynamical heterogeneity
%Z PACS 64.70.Pf,82.70.Gg,82.70.Dd
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X We use time-resolved X-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 $\chi$ of the instantaneous intensity correlation function. The amplitude of dynamical fluctuations has a non-monotonic dependence on scattering vector $q$, in stark contrast with recent experiments on strongly attractive colloidal gels [Duri and Cipelletti, \textit{Europhys. Lett.} \textbf{76}, 972 (2006)]. We propose a simple scaling argument for the $q$-dependence of fluctuations in glassy systems that rationalizes these findings.
%G English
%2 https://hal.science/hal-00133792v3/document
%2 https://hal.science/hal-00133792v3/file/Text.pdf
%L hal-00133792
%U https://hal.science/hal-00133792
%~ CNRS
%~ UNIV-MONTP2
%~ LCVN
%~ UNIV-MONTPELLIER
%~ UM1-UM2