Static adsorption and interfacial tension of Sodium dodecyl sulfate via magnetic field application

Magnetic field exposure could change the properties of fluids, such as water. The application of the magnetic field for wettability alteration of carbonate rocks was investigated in the first part of our study. In this part, however, the interfacial tension of surfactant with crude oil and its static adsorption onto calcite surfaces under the magnetic field application were studied. From the results of this study, it can be pointed out that the magnetic field-treated water, the so-called magnetized water decreased the surface tension. The interfacial tension between crude oil and magnetized water did not significantly change. The value of the CMC for SDS surfactant solution with magnetized water as the solvent was decreased by about 7%. However, magnetic field treatment of surfactant solutions did not change the value of CMC. Besides, the interfacial tension between surfactant solutions and crude oil did not remarkably change via the magnetic field application. Magnetized water increased the equilibrium adsorption of surfactant solutions onto calcite at concentrations above the CMC. As for kinetic behaviors of the surfactant solutions, the pseudo-second-order kinetic model was found to be the best one to predict the kinetic behavior of surfactant solutions prepared with magnetized water and deionized water. Moreover, magnetized water increased the adsorption rate at early times and expedited it onto the adsorbent. The magnetic field could increase the SDS surfactant adsorption (at concentrations above the CMC) onto calcite surfaces only if the adsorbent was maintained in the solutions during the magnetic field treatment.