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Glasses behave as solids due to their long relaxation time; however theorigin of this slow response remains a puzzle. Growing dynamic length scalesdue to cooperative motion of particles are believed to be central to theunderstanding of both the slow dynamics and the emergence of rigidity. Here, weprovide experimental evidence of a growing dynamical heterogeneity length scalethat increases with increasing waiting time in an aging colloidal glass ofLaponite. The signature of heterogeneity in the dynamics follows from dynamiclight scattering measurements in which we study both the rotational andtranslational diffusion of the disk-shaped particles of Laponite in suspension.These measurements are accompanied by simultaneous microrheology andmacroscopic rheology experiments. We find that rotational diffusion ofparticles slows down at a faster rate than their translational motion. Suchdecoupling of translational and orientational degrees of freedom finds itsorigin in the dynamic heterogeneity since rotation and translation probedifferent length scales in the sample. The macroscopic rheology experimentsshow that the low frequency shear viscosity increases at a much faster ratethan both rotational and translational diffusive relaxation times.

Dynamical heterogeneity in aging colloidal glasses of Laponite