Abstract
Rheological properties of dilute surfactant solutions at low shear rate are investigated using a cone viscometer. The plateau viscosity changing with the shear rate can be separated to three regimes: in regime 1, the viscosity decreases with increase of the shear rate while the shear rate is below a threshold shear rate; in regime 2, the shear rate is above the threshold shear rate and the viscosity tends to a little bit increase as the shear rate is increased; In regime 3, the viscosity gradually decreases again with increase of the shear rate. The influencing factors on its viscosity contain concentration, temperature and the weight ratio of counter ions. Through rotating the solutions at a proper shear rate, a significant change of their viscosity at low shear rate was found: it is characterized by large amplified periodic vibration of the tested viscosity. This large vibration is thought to result from the macro worm-like micelles in the viscoelastic surfactant solutions.
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