Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2012-01-23
Physics
Condensed Matter
Soft Condensed Matter
12 pages, 5 figures, Accepted in Soft Matter 2012
Scientific paper
Glasses behave as solids due to their long relaxation time; however the origin of this slow response remains a puzzle. Growing dynamic length scales due to cooperative motion of particles are believed to be central to the understanding of both the slow dynamics and the emergence of rigidity. Here, we provide experimental evidence of a growing dynamical heterogeneity length scale that increases with increasing waiting time in an aging colloidal glass of Laponite. The signature of heterogeneity in the dynamics follows from dynamic light scattering measurements in which we study both the rotational and translational diffusion of the disk-shaped particles of Laponite in suspension. These measurements are accompanied by simultaneous microrheology and macroscopic rheology experiments. We find that rotational diffusion of particles slows down at a faster rate than their translational motion. Such decoupling of translational and orientational degrees of freedom finds its origin in the dynamic heterogeneity since rotation and translation probe different length scales in the sample. The macroscopic rheology experiments show that the low frequency shear viscosity increases at a much faster rate than both rotational and translational diffusive relaxation times.
Bonn Daniel
Jabbari-Farouji Sara
Wegdam Gerard
Zargar Rojman
No associations
LandOfFree
Dynamical heterogeneity in aging colloidal glasses of Laponite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dynamical heterogeneity in aging colloidal glasses of Laponite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamical heterogeneity in aging colloidal glasses of Laponite will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-498267