Adsorption Kinetics of Amphiphilic Janus Nanosheets at the Oil–Water Interface

The adsorption behavior of amphiphilic Janus nanosheets at the oil–water interface plays a critical role in various interfacial applications, such as emulsification and enhanced oil recovery. This work investigates the adsorption kinetics of amphiphilic Janus nanosheets at the oil–water interface by using dynamic interfacial tension measurements and theoretical models. The adsorption process is analyzed in terms of diffusion-controlled kinetics and the influence of Ca2+ concentration on the behavior of amphiphilic Janus nanosheets at the interface. The results show that the adsorption process can be divided into three distinct stages: an initial rapid adsorption stage, a transition phase, and a later phase where the adsorption rate slows and the system approaches equilibrium. Furthermore, the presence of Ca2+ significantly enhances the diffusion of amphiphilic Janus nanosheets to the interface, thereby accelerating the adsorption process. The study also demonstrates that the maximum adsorption concentration of amphiphilic Janus nanosheets at the interface increases with Ca2+ concentration, suggesting that cationic electrolytes can enhance the interfacial adsorption capacity of amphiphilic Janus nanosheets. These findings provide valuable insights into the interfacial behavior of amphiphilic Janus nanosheets and highlight their potential for improving the performance of interfacial systems in various applications.