Electrical double layer at alumina/electrolyte interface

Charge regulation in nanopore ionic field-effect transistors

“…The two fitting parameters Γ 0 = 3.5 × 10 17 m −2 and pK= 6.93 accurately captured the magnitude and sign of the changes in I sd induced by V g gating, and yield values of σ (Fig. 3, right axis) that are consistent with the known properties of Al 2 O 3 [21]. The pK and Γ 0 values obtained from the 10 other responsive nanopores were similar, ranging from 6.2-7.3 and 3.0-4.5×10 17 m −2 , respectively, though the conductance at a single, extreme pH occasionally departed from the predictions by up to ∼ 30%.…”

Mechanisms of Arsenic Adsorption on Amorphous Oxides Evaluated Using Macroscopic Measurements, Vibrational Spectroscopy, and Surface Complexation Modeling

“…The intrinsic equilibrium constants for outer-sphere surface complexation are Eqs. [29]- [37] For the triple-layer application, as for the constant capacitance applications, the surface site density was set at a value of 2.31 sites nm −2 , as recommended by Davis and Kent (25) for natural materials. Numerical values for the intrinsic protonation-dissociation constants and surface complexation constants for the background electrolyte were obtained from the literature.…”

Surface Complexation Modeling of K+, NO3−, SO42−, Ca2+, F−, Co2+, and Cr3+ Ion Adsorption on Silica Gel

“…[2] and [3] in Table 1 are usual in all oxide/electrolyte systems. In reactions [4][5][6][7] the ions are adsorbed in the β-layer (forming a so-called outer-sphere complex) on the opposite-sign charged groups. In Eqs.…”