Analysis of Adsorption Behavior of Cations onto Quartz Surface by Electrical Double-layer Model.

Molecular dynamics simulations of the electrical double layer on smectite surfaces contacting concentrated mixed electrolyte (NaCl–CaCl2) solutions

“…This co-occurrence occurs despite the 0.79 Å difference between the crystal radii of Na + and Cl - [7] and the 1.26 Å difference between the hydrated radii of Na + and Ca 2+ [8], thus contradicting attempts to model zβ * as a fixed (solid-specific) distance plus the hydrated [8,125] or crystalline radius [7] of the adsorbed species. Sodium ISSCs adsorb between the 0-and β-planes (z * = 2.6 ± 0.05 Å), in disagreement with the tenets of the TLM (Fig.…”

“…By analogy with planar capacitors, these parameters are sometimes modeled with the relation [4,32]: Yates et al [3] using the unsupported assumption that ψ d is equal to the electrokinetic "zeta" potential [16,31]) and fitting C 1 to proton and electrolyte adsorption data using the TLM; this method yields C 1 = 0.6 to 2.2 for a range of electrolytes and mineral surfaces [15,[31][32][33]104,125]. Other studies have assumed that C 2 = ∞ (i.e., ψβ = ψ d [107]) or C 2 = C 1 [7,126], or have fitted both C 1 and C 2 [105,107].…”

Complex conductivity of water-saturated packs of glass beads

“…In the pH range 4-10, the surface mineral reactions at the silanol surface sites can be written as follows (see [31,32]):…”

A triple-layer model of the surface electrochemical properties of clay minerals

“…These surface site densities are obtained with a fairly good approximation from crystallographic considerations as discussed at the beginning of Section 2. In the literature, the value of C 2 for a number of minerals is taken constant and usually equal to 0.2 F m −2 [11,12]. In addition, we keep K 1 and K 3 constant because the values of these equilibrium constants do not play a critical role in the determination of both the ζ potential and the surface conductivity as discussed later.…”

“…A second family of applications concerns dielectric spectroscopy of porous materials [9], with applications, for example, to the detection of contaminants at the pore water/minerals interface [10]. In addition, the understanding of the electrokinetic properties of bentonite and low-porosity shales (e.g., electro-and thermo-osmosis) could be important in the study of the migration of ionic species around waste repositories [11].…”