Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00212 : Frequency Dependence of Aging Dynamics in a Colloidal Glass
Author:
The aging response of glassy particulate systems originates due
to slow structural rearrangements of its constituent matter. It
is reasonable to speculate that structural rearrangements on
different length scales should manifest themselves in dynamical
response on different timescales. Here we consider the frequency
dependence of aging in a colloidal glassy system using parallel
superposition bulk rheology. The aging behavior of the system is
characterized by time evolution of the complex modulus in
response to a sinusoidally varying probe stress of different
frequencies superimposed on a steady background stress.
Strikingly, the system displays more rapid aging when observed at
smaller frequencies. This suggests that, by comparison, it is
more arrested on shorter length scales (higher frequencies) than
on the longer length scales where many-particle correlated
motions are in effect. Such correlated motions are believed to be
responsible for relaxation in glassy materials. The variation in
the aging dynamics at different frequencies is more prominent at
higher background stresses where the system is more fluidized.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.212
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