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In the range of γ ̇ = 1 to 15 s-1 a shampoo displayed shear-thinning behavior and at γ ̇ = 30 s-1 occurred a dilatancy peak. The shampoo manufacturer wanted the shampoo to show a certain superstructure in this shear rate range, which corresponds to the process when flowing out of the shampoo bottle. Consumers then subconsciously believe that they have bought a liquid showing “body”. In this case, the goal was reached via superstructures, built up by visco-

elastic surfactants. (VES; see also Chapter 9.1.1d: worm-like micelles).

Note 3: Temperature-dependent shear thickening of elastomers .

Different temperatures can lead to fundamentally different kinds of flow behavior of filled and unfilled elastomers and rubber). mixtures.

Figure 3.19: Viscosity curve of a highly filled suspension showing immediate shear thickening when reaching the critical shear rate γ ̇ crit (“dilatant switch”)