%0 Journal Article
%T Power law viscoelasticity of a fractal colloidal gel
%+ Laboratoire Charles Coulomb (L2C)
%A Aime, Stefano
%A Cipelletti, Luca
%A Ramos, Laurence
%Z . Réf Journal: Journal of Rheology, 62, 1429-1441 (2018)
%< avec comité de lecture
%Z L2C:18-149
%@ 0148-6055
%J Journal of Rheology
%I American Institute of Physics
%V 62
%P 1429-1441
%8 2018
%D 2018
%Z 1802.03820
%R 10.1122/1.5025622
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X Power law rheology is of widespread occurrence in complex materials that are characterized by the presence of a very broad range of microstructural length and time scales. Although phenomenological models able to reproduce the observed rheological features exist, in general a well-established connection with the microscopic origin of this mechanical behavior is still missing. As a model system, this work focuses on a fractal colloidal gel. We thoroughly characterize the linear power law rheology of the sample and its age dependence. We show that at all sample ages and for a variety of rheological tests the gel linear viscoelasticity is very accurately described by a Fractional Maxwell (FM) model, characterized by a power law behavior. Thanks to a unique set-up that couples small-angle static and dynamic light scattering to rheological measurements, we demonstrate that the power law rheology observed in the linear regime originates from reversible non-affine rearrangements and discuss the possible relationship between the FM model and the microscopic structure of the gel.
%G English
%L hal-01889803
%U https://hal.science/hal-01889803
%~ CNRS
%~ OPENAIRE
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ ANR
%~ UM-2015-2021