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Colloidal suspensions that are out of thermodynamic equilibrium undergophysical aging wherein their structure evolves to lower the free energy. Inaqueous suspension of Laponite, physical aging accompanies increases of elasticand viscous moduli as a function of time. In this work we study temporalevolution of elastic and viscous moduli at different frequencies and observethat freshly prepared aqueous suspension of Laponite demonstrates identicalrheological behavior reported for the crosslinking polymeric materialsundergoing chemical gelation. Consequently at a certain time tan{\delta} isobserved to be independent of frequency. However, for samples preserved underrest condition for longer duration before applying the shear melting, theliquid to solid transition subsequent to shear melting shows greater deviationfrom classical gelation. We also obtain continuous relaxation time spectra fromthe frequency dependence of viscous modulus. We observe that, with increase inthe rest time, continuous relaxation time spectrum shows gradual variation fromnegative slope, describing dominance of fast relaxation modes to positive sloperepresenting dominance of slow relaxation modes. We propose that the deviationfrom gelation behavior for the shear melted suspensions originates frominability of shear melting to completely break the percolated structure therebycreating unbroken aggregates. The volume fraction of such unbroken aggregatesincreases with the rest time. For small rest times presence of fewer number ofunbroken aggregates cause deviation from the classical gelation. On the otherhand, at high rest times presence of greater fraction of unbroken aggregatessubsequent to shear melting demonstrate dynamic arrest leading to inversion ofrelaxation time spectra.

Rheological Signatures of Gelation and Effect of Shear Melting on Aging Colloidal Suspension