The mechanism of electrowetting in the liquid/liquid configuration adopted for the experiments, is illustrated in Figure , where , and are the solid/electrolyte, solid/insulator (solvent) and electrolyte/insulator interfacial surface tensions, respectively. Note that within the applied potential range, only is potential dependent. This is due to the fact that in contrast to the solid/electrolyte interface where the potential drop extends within a range defined by the EDL thickness (i.e., on the order of the Debye length of the electrolyte), the corresponding potential drop at the droplet/electrode interface is distributed across the entire microscopic droplet. The latter would necessitate the application of a significantly higher energy input to overcome the introduced ohmic drop, which would far exceed the potential range employed in this study. Initially, the insulating droplet rests at the potential of zero charge ( ) where it exhibits its minimum contact angle (also at , obtains its maximum value, conceptually similar to the maximum observed at in the classical electrocapillary curves). Upon application of a bias away from , the decrease in drives the receding motion of the insulating droplet and therefore the increase in its contact angle . The overall process is macroscopically described by combining Young's equation with the thermodynamic definition of EDL capacitance at a constant chemical potential, , as follows: