I am new to the field of rheology. Recently, I have conducted a frequency sweep test for silicone suspensions and found that G" is always higher than G' over the frequency range of 0.1-100 rad/s. How could this phenomenon be explained? At the same time, both moduli are increasing with the increasing frequency.
Silicone suspensions were prepared by adding iron powders.
I appreciate your help.
Hi, I'm going to take a shot at this one. I believe that when G''>G' the silicone suspensions are more viscous than elastic, so respond more like a liquid to the oscillatory load applied and do not retain their original configuration prior to the application of the load. The opposite is true as well. Whenever a material has G'>G'', then the suspensions are more elastic than viscous, so they respond more like a solid body and are more likely to return to their original configuration (to a greater extent) after the load is applied. Hope this helped.
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