Electron transfer at micro liquid–liquid interfaces

Voltammetric determination of extreme standard Gibbs ion transfer energy

“…In particular, liquid|liquid micro-interfaces offer several advantages in comparison with larger interfaces such as a significant reduction of the ohmic potential drop, a reduction of the capacitive currents, and steady-state responses [5][6][7][8]. Indeed, whether using micro-ITIES supported by a laser-drilled microhole in a thin film [6][7][8][9][10][11][12] or at the tip micropipettes [9,[13][14][15] it has been shown that these micro-interfaces are very useful both for thermodynamic and kinetic measurements [5][6][7][8]11,12,16]. By comparison with microholes, voltammetric studies with micropipettes have to consider asymmetric diffusion fields and account for a relatively high electrical resistance within the pipette [8].…”

Voltammetry of tetraalkylammonium picrates at water∣nitrobenzene and water∣dichloroethane microinterfaces; influence of partition phenomena

“…Microholes drilled through very thin films of different materials have proved to be more useful; because of the reduced length of the channel, working under true planar or radial regimes becomes possible. Diffusion at such lITIES has been studied [9][10][11], but it has been concluded that the measurements at the microhole-supported ITIES are neither accurate nor reliable [12]. It has also been shown that the film of polymer in between the two elecrolyte solutions, 0022 induces a stray capacitance [13].…”

“…It has also been shown that the film of polymer in between the two elecrolyte solutions, 0022 induces a stray capacitance [13]. Some experimental work has however shown that these devices can be adapted to thermodynamic [3,[9][10][11]14,15] as well as kinetic measurements [2,12,16]. It has been demonstrated [17] that the exact position of the interface between the two immiscible phases can be determined, through the use of the inlaid or recessed electrode concepts developed for solid microelectrodes [18,19] More importantly, it has been possible to prove that the separation between the two liquids is positioned at the opening of the channel in the solvent phase, when the aqueous medium is introduced first, before the organic phase [17].…”

Electrochemical activity and metal deposition using few-layer graphene and carbon nanotubes assembled at the liquid–liquid interface

“…1D-d), according to Reaction 1 [19,20], or an analogous homogeneous process, coupled to ion transfer [21]. The concentration of DMFc, z, was much lower (100 μM, low enough to avoid the presence of a DMFc + cation transfer peak [19,20]) than those of both ferricyanide (x(Fe(CN) 6 3− ) = 0.1 M) and ferrocyanide (y(Fe(CN) 6 4− ) = 0.01 M), so the process must be limited by the transport of DMFc/DMFc + to the interface [19,20].…”

“…1E provides an overview of the voltammetric curves recorded on the exfoliated GR layer assumed to have an interfacial density of 8.41 μg cm −2 , based on complete adsorption of the GR at the ITIES. The peak separation at scan rates between 10 and 100 mV s −1 varied from 62 to 76 mV, which implies a quasi-reversible process [20]. The enhanced current seen in the presence of the GR is used to calculate an effective interfacial area, from the slope of the linear fitting of the scatter plot in the inset (Fig.…”