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Dilute Laponite suspensions in water at low salt concentration form repulsivecolloidal glasses which display physical aging. This phenomenon is still notcompletely understood and in particular, little is known about the connectionbetween the flow history, as a determinant of the initial state of the system,and the subsequent aging dynamics. Using a stress controlled rheometer, weperform stress jump experiments to observe the elastic component of the flowstress that remains on cessation of flow or flow quenching. We investigate theconnection between the dynamics of these residual stresses and the rate ofphysical aging upon quenching from different points on the steady state flowcurve. Quenching from high rates produces a fluid state, G">G', with small,fast relaxing residual stresses and rapid, sigmoidal aging of the complexmodulus. Conversely, quenching from lower shear rates produces increasinglyjammed states featuring slowly relaxing stresses and a slow increase of thecomplex modulus with system age. Flow cessation from a fixed shear rate withvarying quench durations shows that slower quenches produce smaller residualstresses at short times which relax at long times by smaller extents, bycomparison with faster quenches. These smaller stresses are correlated with ahigher modulus but slower physical aging of the system. The characteristic timefor the residual stress relaxation scales inversely with the quench rate. Thisimplies a frustrated approach to any ideal stress-free state that succinctlyreflects the frustrated nature of these glassy systems.

Physical aging and relaxation of residual stresses in a colloidal glass following flow cessation