  We study aging behavior of aqueous suspension of Laponite as a function of
concentration of Laponite, concentration of salt, time elapsed since
preparation of suspension (idle time) and temperature by carrying extensive
rheological and conductivity experiments. We observe that temporal evolution of
elastic modulus, which describes structural buildup and aging, shifts to low
times for experiments carried out for higher concentration of Laponite, higher
concentration of salt, greater temperature and on higher idle time while
preserving the curvature of evolution in the solid regime. Consequently
appropriate shifting of evolution of elastic modulus in the solid regime leads
to aging time idle time salt concentration Laponite concentration temperature
superposition. Existence of such superposition suggests generic nature of
microstructure buildup irrespective of mentioned variables in the explored
range. Behavior of shift factors needed to obtain the superposition indicate
that energy barrier associated with structural buildup decreases with increase
in idle time and temperature; and decreases linearly with increase in
concentration of Laponite and that of salt. The conductivity experiments show
that ionic conductivity of the suspension increases with increasing Laponite
concentration, salt concentration, temperature and very importantly the idle
time. We also analyze the interparticle interactions using DLVO theory that
suggests increase in idle time, temperature and salt concentration increases
height of repulsive energy barrier while decreases width of the same when
particles approach each other in a parallel fashion. Analysis of rheological
and conductivity experiments suggest strong influence of attractive
interactions on the low energy structures in aqueous suspension of Laponite.
