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In this work we study the aging behavior of aqueous suspension of Laponitehaving 2.8 weight % concentration using rheological tools. At various saltconcentration all the samples demonstrate orientational order when observedusing crossed polarizers. In rheological experiments we observe inherentirreversibility in the aging dynamics which forces the system not to rejuvenateto the same state in the shear melting experiment carried out at a later datesince preparation. The extensive rheological experiments carried out as afunction of time elapsed since preparation demonstrate the self similar trendin the aging behavior irrespective of the concentration of salt. We observethat the exploration of the low energy states as a function of aging time isonly kinetically affected by the presence of salt. We estimate that the energybarrier to attain the low energy states decreases linearly with increase in theconcentration of salt. The observed superposition of all the elapsed time andthe salt concentration dependent data suggests that the aging that occurs inlow salt concentration systems over a very long period is qualitatively similarto the aging behavior observed in systems with high salt concentration over ashorter period.

Irreversible Aging Dynamics and Generic Phase Behavior of Aqueous Suspensions of Laponite