The double layer at the interface between two immiscible electrolyte solutions

Electrochemistry at the interface between two immiscible electrolyte solutions (IUPAC Technical Report)

“…The electrocapillary maximum was found at a potential (the potential of zero charge, PZC), which corresponds to ∆ o w φ ≈ 0, i.e., at the PZC where the inner-layer potential difference is rather small [127,128]. A similar result was obtained for the water-1,2-dichloroethane interface by the pendant-drop video-image [61], drop-time [129], and the streaming-jet electrode [130] techniques. On this basis, a method was proposed for measuring directly the Gibbs energy of ions by referring the values of the Galvani potential scale to the PZC [131].…”

Understanding the anatomy of capacitance at interfaces between two immiscible electrolytic solutions

“…Torrie and Valleau [23] suggested a primitive model in which penetration of ions close to the interface was controlled by image forces but did not introduce an inner layer with distinct properties. Samec et al [24] were the first to incorporate a separate inner layer. In their model, only organic ions were allowed to enter the inner region and no free energy of transfer from the bulk to the inner layer was considered.…”

Long-wave interface instabilities of a two-liquid DC electroosmotic system for thin films

“…The interface is represented by y ¼ h x; t ð Þ: The zeta potential of the substrate at the upper and lower walls is represented by f u and f b ; respectively; f I and Q I are the zeta potential and the surface charge density present at the interface, respectively, (Choi et al 2011) and are taken as independent parameters. In the experimental studies of the interface between two immiscible electrolyte solutions (ITIES), Samec et al (1985) showed that for a given interface zeta potential (f I ), the surface charge density (Q I ) can be varied by varying the electrolyte concentrations. The water/nitrobenzene interface with LiCl in water and tetrabutylammonium tetraphenylborate (TBATPB) can be considered as an example of ITIES (Senda et al 1991).…”

“…A system of two immiscible electrolyte solutions is also possible in which both liquids experience EOF. The interface between these two immiscible electrolyte solutions has been studied by Samec et al (1985) and Senda et al (1991). It can be described using the modified Verwey-Niessen (MVN) model, which represents the interface as a double layer with excess positive space charge in one phase and equal negative space charge in the other phase separated by an inner or compact layer of oriented solvent molecules (Samec et al 1985).…”