Effect of Dielectric Saturation on Disjoining Pressure in Thin Films of Aqueous Electrolytes

Basu, Subhayu; Sharma, Mukul M.

doi:10.1006/jcis.1994.1241

Cited by 63 publications

(57 citation statements)

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“…This could, for example, imply that on close approach (in contact) the total charge on the two surfaces, including any bound ions, becomes zero. Such a charge regulation mechanism results in interaction curves between the extremes of constant charge and constant potential (31,32). Another important feature of the experimental interaction curves in Fig.…”

Section: Force Measurements Between Amino-functionalized Silica Surfacesmentioning

confidence: 96%

Interactions between Acid- and Base-Functionalized Surfaces

Giesbers

Kleijn²,

Stuart

2002

Journal of Colloid and Interface Science

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Section: Force Measurements Between Amino-functionalized Silica Surfacesmentioning

confidence: 96%

Interactions between Acid- and Base-Functionalized Surfaces

Giesbers

Kleijn²,

Stuart

2002

Journal of Colloid and Interface Science

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“…The potential energy of repulsion between 2:1 phyllosilicate layers is the sum of the net hydration energy for the interlayer cations (Gh0)), the net hydration energy for the negative surface charge sites (Gh(s)) and Born repulsion energy (Gb). Net hydration energies may be estimated using the Born equation (Basu and Sharma 1994) as the change in electrostatic free energy of an ion on reversibly and isothermally moving the ion from a solution of one dielectric to another. By using this approach, the net hydration energy for interlayer cations in 2:1 phyllosilicates becomes:…”

Section: Modelmentioning

confidence: 99%

Model for Crystalline Swelling of 2:1 Phyllosilicates

Laird

1996

Clays and clay miner.

126

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Abstract--A macroscopic energy balance model for crystalline swelling of 2:1 phyllosilicates is presented. Crystalline swelling for a static system is modeled by a balance among the potential energies of attraction, repulsion and resistance. The potential energy of attraction is due to both the electrostatic interaction between the interlayer cations and the negative surface charge sites and to van der Waals attraction between layers. The potential energy of repulsion is due to the net hydration energy for the interlayer cations, the net hydration energy for the negative surface charge sites and Born repulsion. The potential energy of resistance represents irreversible work needed to overcome the mechanical resistance of the clay water system to both expansion and collapse. The potential energy of resistance is responsible for both hysteresis and the stepwise nature of crystalline swelling.A numerical solution of the crystalline swelling model is presented and shown to yield reasonable estimates of basal spacings for octahedrally charged clays. Measured and predicted basal spacings are directly compared and are in general agreement (r 2 = 0.39). Most of the scatter for the measured vs. predicted basal spacing relationship is attributed to inaccuracies of the assumptions used for the numerical solution. The crystalline swelling model readily accounts for the effects of layer charge and nature of the interlayer cations upon crystalline swelling, but does not account for the effect of charge site location upon crystalline swelling.

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“…Further, with a decreasing separation, the surface charge decreases and the assumption of a smeared-out surface charge becomes increasingly difficult to uphold, while at low enough separations the number of atom "layers" between the surfaces may become too low for a continuum approach to be appropriate. Despite these important reservations, the PB equation certainly has predictive power for the interaction of close hydrophilic surfaces in water: the PB equation (together with Van der Waals attraction) quantitatively describes the steep repulsion that has been found between close oxidic surfaces in the surface force apparatus and the atomic force microscope (3)(4)(5) and explains the possibility of a deep and reversible potential minimum for very close surfaces (5).…”

Section: Introductionmentioning

confidence: 98%

Simplifications of the Poisson–Boltzmann Equation for the Electrostatic Interaction of Close Hydrophilic Surfaces in Water

Biesheuvel

2001

Journal of Colloid and Interface Science

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Effect of Dielectric Saturation on Disjoining Pressure in Thin Films of Aqueous Electrolytes

Cited by 63 publications

References 0 publications

Interactions between Acid- and Base-Functionalized Surfaces

Interactions between Acid- and Base-Functionalized Surfaces

Model for Crystalline Swelling of 2:1 Phyllosilicates

Simplifications of the Poisson–Boltzmann Equation for the Electrostatic Interaction of Close Hydrophilic Surfaces in Water

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