TY - JOUR
T1 - Collective motion of macroscopic spheres floating on capillary ripples
T2 - Dynamic heterogeneity and dynamic criticality
AU - Sanli Cakir, Céyda
AU - Saitoh, Kuniyasu
AU - Luding, Stefan
AU - Van Der Meer, Devaraj
PY - 2014/9/30
Y1 - 2014/9/30
N2 - When a densely packed monolayer of macroscopic spheres floats on chaotic capillary Faraday waves, a coexistence of large scale convective motion and caging dynamics typical for glassy systems is observed. We subtract the convective mean flow using a coarse graining (homogenization) method and reveal subdiffusion for the caging time scales followed by a diffusive regime at later times. We apply the methods developed to study dynamic heterogeneity and show that the typical time and length scales of the fluctuations due to rearrangements of observed particle groups significantly increase when the system approaches its largest experimentally accessible packing concentration. To connect the system to the dynamic criticality literature, we fit power laws to our results. The resultant critical exponents are consistent with those found in densely packed suspensions of colloids.
AB - When a densely packed monolayer of macroscopic spheres floats on chaotic capillary Faraday waves, a coexistence of large scale convective motion and caging dynamics typical for glassy systems is observed. We subtract the convective mean flow using a coarse graining (homogenization) method and reveal subdiffusion for the caging time scales followed by a diffusive regime at later times. We apply the methods developed to study dynamic heterogeneity and show that the typical time and length scales of the fluctuations due to rearrangements of observed particle groups significantly increase when the system approaches its largest experimentally accessible packing concentration. To connect the system to the dynamic criticality literature, we fit power laws to our results. The resultant critical exponents are consistent with those found in densely packed suspensions of colloids.
UR - http://www.scopus.com/inward/record.url?scp=84908052404&partnerID=8YFLogxK
U2 - 10.1103/PhysRevE.90.033018
DO - 10.1103/PhysRevE.90.033018
M3 - Article
AN - SCOPUS:84908052404
SN - 1539-3755
VL - 90
JO - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
JF - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
IS - 3
M1 - 033018
ER -