I believe that this graph shows that the gel sample undergoes a decrease in its elasticity at greater angular frequencies because it undergoes an increase in complex shear strain with increasingly less complex shear stress beyond certain load frequencies. Conversely, the gel tends to retain its elasticity at lower load frequencies.
However, the curve representing the complex viscosity as a function of time seems to tell me the exact opposite: That at lower load frequencies, the sample experience rapid decline in complex viscosity, so it becomes more elastic. I would greatly appreciate an explanation of this result.
I suggeste to check G' and G'' . It might give information related to mechanical propreties. Agree, evaporation is a serious cause of these phenomenons. Think to an humidity tank around your plates.
Dear Alberta,
in my opinion the graph shows only a narrow frequency band (more or less two decades), so the elastic (and viscoelastic) behavior is not well represented and the gel under investigation is probably in the so-called "transition region". As suggested by Nabyl, if you check G' and G" things become more clear. Moreover take into account that hydrogels tends to strongly vary mechanical propertis with time.
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