Rheological aging and rejuvenation in microgel pastes
We have studied experimentally the rheological behavior of concentrated suspensions of soft deformable microgels below the yield point. We have found history-dependent effects which are interpreted in terms of aging and rejuvenation phenomena, analogous to those existing in glassy systems. The stress amplitude controls the long-time memory and determines the slow evolution of the suspensions.
Cloitre
M
Laboratoire CNRS-ATOFINA, 95, rue Danton, 92303 Levallois-Perret, France.
Borrega
R
Leibler
L