Equilibrium measurements of oscillatory disjoining pressures in aqueous foam films

Bergeron, Vance; Radke, Clayton J.

doi:10.1021/la00048a028

Cited by 371 publications

(381 citation statements)

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“…10,11 Hence, models such as the DLVO theory, which includes both double layer interactions and a dielectric continuum, should and indeed fail in the description of the repulsive interactions measured in NBFs experiments. 9,12 This conclusion should apply to other confined systems, e.g., DNA columnar phases, 13 which show similar repulsive forces when the distance between the DNA molecules is <10 Å. To explain the repulsion a new type of force, hydration forces, has been introduced.…”

Section: Introductionmentioning

confidence: 90%

Adhesive transitions in Newton black films: A computer simulation study

Bresme

Chacón

Martínez

et al. 2011

The Journal of Chemical Physics

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We report molecular dynamics simulations of Newton black films (NBFs), ultra thin films of aqueous solutions stabilized with two monolayers of ionic surfactants, sodium dodecyl sulfate. We show that at low water content conditions and areas per surfactant corresponding to experimental estimates in NBFs, homogeneous films undergo an adhesion "transition," which results in a very thin adhesive film coexisting with a thicker film. We identify the adhesive film with the equilibrium structure of the Newton black film. We provide here a direct microscopic view of the formation of these important structures, which have been observed in experimental studies of emulsions and foams. We also report a detailed investigation of the structural properties and interfacial fluctuation spectrum of the adhesive film. Our analysis relies on the definition of an "intrinsic surface," which is used to remove the averaging effect that the capillary waves have on the film properties.

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Section: Introductionmentioning

confidence: 90%

Adhesive transitions in Newton black films: A computer simulation study

Bresme

Chacón

Martínez

et al. 2011

The Journal of Chemical Physics

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“…For a given foam flowing in a porous medium of permeability k and porosity Φ, capillary tube radius r is equivalent to the quantity 8k/Φ and r c is related to the disjoining pressure of the films of the foam under consideration [47]. r c is therefore assumed invariant for the same foam displaced through different porous media.…”

Section: Effect Of Permeability On M Refmentioning

confidence: 99%

Calibrating and interpreting implicit-texture models of foam flow through porous media of different permeabilities

Gassara

Douarche

Braconnier

et al. 2017

Journal of Petroleum Science and Engineering

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This paper proposes a robust methodology to calibrate steady-state models of foam flow through porous reservoirs from foam displacements on core samples. The underlying approach is an equivalence between foam mobility and foam lamellas density (or texture) at local-equilibrium. This calibration methodology is applied to foam displacements at different qualities and velocities on a series of sandstones. Its advantage lies in a deterministic transcription of flow measurements into texture data, by comparison with commonly-applied least-square-fit methods that may yield non unique solutions.Scaling trends of foam parameters with porous medium permeability are then identified and discussed with the help of theoretical representations of foam flow in a confined medium. Although they remain to be further confirmed from other well-documented experimental data sets, these scaling laws can increase the reliability of reservoir simulators for the assessment of foam-based improved recovery processes in heterogeneous reservoirs.

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“…These contributions can arise from a number of interactions such as Van der Waals forces, double layer attraction or repulsion as well as steric effects and molecular or supramolecular layering (Derjaguin et al 1987). For instance in ''black'' soap films the disjoining pressure can be an oscillatory function of film thickness as a consequence of micellar layering (Bergeron and Radke 1992). Schwartz and Eley (1998) introduced a phenomenological model for P; which exhibits a single minimum but no local maximum…”

Section: Theoretical Model and Numerical Implementationmentioning

confidence: 99%

Dry-spot nucleation in thin liquid films on chemically patterned surfaces

Brasjen

Darhuber

2011

Microfluid Nanofluid

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We systematically study the influence of chemical patterning on the instability of thin liquid films induced by chemical heterogeneities on a flat, horizontal, and partially wetting substrate. We consider common geometric shapes like wedges, circles, and stripes and determine the time required for nucleation of a dry-spot as a function of film thickness, contact angle, pattern dimensions, and geometry. Moreover, we characterized the resulting liquid distribution and identified conditions that avoid the formation of residual droplets on the less wettable regions, which is usually undesirable in technological applications.

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Equilibrium measurements of oscillatory disjoining pressures in aqueous foam films

Cited by 371 publications

References 0 publications

Adhesive transitions in Newton black films: A computer simulation study

Adhesive transitions in Newton black films: A computer simulation study

Calibrating and interpreting implicit-texture models of foam flow through porous media of different permeabilities

Dry-spot nucleation in thin liquid films on chemically patterned surfaces

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