Worm-like micelles entangle and form networks like polymeric fluids. In the present study surfactant solutions system of CTAB/NaSal were used to examine the flow property with a stress-controlled cone-and-plate rheometer and carry out the creep test. At relatively low salt concentrations, the dependence of the shear rate on time was observed on creep test and it took a very long time to converge on constant shear rate. Flow property obtained from the creep test apparently exhibited shear-rate-jump after shear-thinning was observed. It is thought that this phenomenon was related with the structural change of micellar networks. On the other hand, at relatively high salt concentrations, the shear rate kept constant in shorter time after start-up. The shear-rate-jump was not observed.
