The micelle structural transformation is easily

The micelle structural Entinostat is easily reflected by its degree of viscoelasticity due to the molecular rearrangement between different micelle structures [29]. Rheological measurement is one of the best methods to follow the extent of the structural transformation. As per our previous report, the long TLM (top layer) was found to be approximately 4 times more viscoelastic than the WLM before sonication. On the other hand, the TM (bottom layer) was found to possess viscosity almost similar to that of water. The transformed structure was irreversible upon heating [29]. This is an advantage to EOR process as the surfactant will not lose its surface activity at the high temperature conditions in the reservoir [14]. Losing its surface activity results in decreasing efficiency in oil recovery [14]. Therefore, the ability of US to cater second law of thermodynamics (entropy) reaction may be a breakthrough for applications in industries such as EOR and need to be understood well. For this reason, experiments with varying sonication parameters, viz., a range of ultrasonic frequency at the same power, and with horn and plate type transducers, were carried out in order to expand the knowledge base. The power was fixed at 40 W and the temperature was maintained at 30 °C. The images and the viscosity values of the final solution are shown in Fig. 2.