Carbopol aqueous gels are widely used as a model of the yields stress fluids for the experiments.
They are transparent and not thixotropic.
Do you know other fluids with these properties?
Dear Dr. Magnin,
The best example of a non thixotropic (in the wikipedia sense) and transparent material is carbopol.
As we have shown here: http://link.springer.com/article/10.1007/s00397-010-0430-4
carbopol shows very little time dependency.
F. Caton
All gels have a yield stress, since they don't flow until a certain stress, required to break the intermolecular bonds, is reached. Thixtropic flow appears with large macromolecules, that have a time-dependent recovery of their equlibrium structure, after being alined in the shearing flow. Therefor gels, composed of flexible or short chains, are likely to exhibit less thixotropic behaviour. / Regards from Johan at www.ontargetchemistry.com, Uppsala, Sweden.
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