Equilibrium interfacial tension and the influence of extreme dilutions of uni-univalent salts: An expression of the “Jones–Ray effect”

Saien, Javad; Mishi, Syden

doi:10.1016/j.jct.2012.04.012

Cited by 4 publications

(1 citation statement)

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“…Thus, Figure 2d shows that the interfacial tension reduction for <0.1 mol/L Ca 2+ is~1.4 mN/m, similar to values obtained elsewhere [60]. Suggested reasons for this effect have been debated, and have included cation [60], anion [62][63][64] or impurity [65] adsorption, or electrostatic effects influencing water structure at the interface [66,67]. The curve fitted through the experimental data in Figure 2d is of the form γ = γ 0 − Aγ 0.5 + Bγ, where A and B are empirical constants (0.158 (mN/m) 0.5 and 0.217, respectively) and γ 0 is the interfacial tension of the n-heptane/water interface (48.4 mN/m).…”

Section: Na Adsorption At the N-heptane/water Interfacesupporting

confidence: 67%

Metal Ion Interactions with Crude Oil Components: Specificity of Ca2+ Binding to Naphthenic Acid at an Oil/Water Interface

Taylor

Chu

2018

Colloids and Interfaces

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Abstract:On the basis of dynamic interfacial tension measurements, Ca 2+ has been shown specifically to interact with naphthenic acid (NA) at the n-heptane/water interface, consistent with NA adsorption followed by interfacial complexation and formation of a more ordered interfacial film. Optimum concentrations of Ca 2+ and NA have been found to yield lower, time-dependent interfacial tensions, not evident for Mg 2+ and Sr 2+ or for several alkali metal ions studied. The results reflect the specific hydration and coordination chemistry of Ca 2+ seen in biology. Owing to the ubiquitous presence of Ca 2+ in oilfield waters, this finding has potential relevance to the surface chemistry underlying crude oil recovery. For example, "locking" acidic components at water/oil interfaces may be important for crude oil emulsion stability, or in bonding bulk oil to mineral surfaces through an aqueous phase, potentially relevant for carbonate reservoirs. The relevance of the present results to low salinity waterflooding as an enhanced crude oil recovery technique is also discussed.

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