Contribution of different physical forces to the disjoining pressure of a thin water film being pressed by an oil droplet

Kumar, Deepak; Biswas, Sushanta

doi:10.1016/j.jcis.2010.04.009

Cited by 19 publications

(11 citation statements)

References 39 publications

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“…(1) is obtained considering the LPL which is not verified as jW 2 j ¼ 146 mV. Furthermore, Kumar and Biswas 16 report a glass surface potential in water lying between À45 and À85 mV for pH ¼ 6. The approximations needed for the constant surface potential model [ Fig.…”

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confidence: 92%

“…[10][11][12][13][14][15] A surface force apparatus can be adapted to study liquid-liquid-solid configurations, but its use does not allow for gas-liquid-solid configurations. 1,16 Consequently, fluid-liquid-solid configurations are commonly studied using a bubble or droplet mechanically pressed over a wetting film deposited on a substrate. [17][18][19][20] The maximum disjoining pressure range experimentally achieved with this technique lies below 500 Pa. A major limitation of those methods is the drainage time one has to wait between two measurement points as it can last several hours.…”

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confidence: 99%

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Laplace pressure based disjoining pressure isotherm in non symmetric conditions

Huerre

Valignat

Maggs

et al. 2017

Applied Physics Letters

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Understanding the stability and dynamics of two phase systems, such as foams and emulsions, in porous media is still a challenge for physicists and calls for a better understanding of the intermolecular interactions between interfaces. In a classical approach, these interactions are investigated in the framework of Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory by building disjoining pressure isotherms. This paper reports on a technique allowing the measurement of disjoining pressure isotherms in a thin liquid film squeezed by either a gas or a liquid phase on a solid substrate. We couple a Reflection Interference Contrast Microscopy set-up to a microfluidic channel that sets the disjoining pressure through the Laplace pressure. This simple technique is found to be both accurate and precise. The Laplace pressure mechanism provides extremely stable conditions and offers opportunity for parallelizing experiments by producing several drops in channels of different heights. We illustrate its potential by comparing experimental isotherms for oil—[(water and sodium dodecyl sulfate (SDS)]—glass systems with different models focusing on the electrostatic contribution of the disjoining pressure. The extracted values of the interface potentials are in agreement with the constant surface potential model and with a full computation. The derived SDS surface concentration agrees with values reported in the literature. We believe that this technique is suitable for investigating other working fluids and intermolecular interactions at smaller scales.

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confidence: 92%

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confidence: 99%

Laplace pressure based disjoining pressure isotherm in non symmetric conditions

Huerre

Valignat

Maggs

et al. 2017

Applied Physics Letters

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“…22 While polystyrene films were prepared by a similar graft-to procedure, 23,24 force measurements between the PS films and mica surfaces were not reported. Studies between liquid silicone films and mica surfaces have been done with AFM, 25,26 but the liquid film adds additional complexity due to hydrodynamic interactions. The siliconeÀmica system described here utilizes two inherently stable surfaces and allows for unambiguous insights into the interaction potential and specifically the separate electrostatic, hydrophobic, and steric contributions between silicone and mica surfaces.…”

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confidence: 99%

Asymmetric Electrostatic and Hydrophobic–Hydrophilic Interaction Forces between Mica Surfaces and Silicone Polymer Thin Films

et al. 2013

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We have synthesized model hydrophobic silicone thin films on gold surfaces by a two-step covalent grafting procedure. An amino-functionalized gold surface reacts with monoepoxy-terminated polydimethylsiloxane (PDMS) via a click reaction, resulting in a covalently attached nanoscale thin film of PDMS, and the click chemistry synthesis route provides great selectivity, reproducibility, and stability in the resulting model hydrophobic silicone thin films. The asymmetric interaction forces between the PDMS thin films and mica surfaces were measured with the surface forces apparatus in aqueous sodium chloride solutions. At an acidic pH of 3, attractive interactions are measured, resulting in instabilities during both approach (jump-in) and separation (jump-out from adhesive contact). Quantitative analysis of the results indicates that the DerjaguinÀLandauÀVerweyÀOverbeek theory alone, i.e., the combination of electrostatic repulsion and van der Waals attraction, cannot fully describe the measured forces and that the additional measured adhesion is likely due to hydrophobic interactions. The surface interactions are highly pH-dependent, and a basic pH of 10 results in fully repulsive interactions at all distances, due to repulsive electrostatic and steric-hydration interactions, indicating that the PDMS is negatively charged at high pH. We describe an interaction potential with a parameter, known as the Hydra parameter, that can account for the extra attraction (low pH) due to hydrophobicity as well as the extra repulsion (high pH) due to hydrophilic (steric-hydration) interactions. The interaction potential is general and provides a quantitative measure of interfacial hydrophobicity/hydrophilicity for any set of interacting surfaces in aqueous solution.

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“…38 The water− hydrocarbon interface carries a negative charge attributed to the adsorption of the hydroxyl group from water to the hydrocarbon surface. 47 To describe the oil/water interfaces, application of constant charge 27 and constant potential 32 boundary conditions was reported. Thus, we decided to determine the double-layer repulsion for both cases and chose the more suitable one according to the experimental contact angle values.…”

Section: Porous Mediamentioning

confidence: 99%

“…However, DLVO theory was also utilized for evaluating different processes such as colloidal stability, adsorption, , other interaction between materials in aquatic environment, , and so on. However, much evidence − demonstrated that DLVO interactions were not sufficient to account for some experimental data, and other surface forces (namely, non-DLVO interaction) were required to be considered. Thus, the disjoining pressure isotherms could be written in the following general form where Π vdW and Π EDL are van der Waals and electrical double-layer disjoining pressure, respectively.…”

Section: Introductionmentioning

confidence: 99%

Wettability Alteration Modeling for Oil-Wet Calcite/Silica Nanoparticle System Using Surface Forces Analysis: Contribution of DLVO versus Non-DLVO Interactions

Monfared

Ghazanfari

Kazemeini

et al. 2018

Ind. Eng. Chem. Res.

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In this work, application of silica nanoparticles for wettability alteration of initially oil-wet calcite was investigated through analysis of surface forces and DLVO theory. Doing so, the wettability and zeta potential of calcite surfaces were measured through the sessile drop method and an inhouse experimental setup, respectively. Primary evaluation indicated that incorporating DLVO terms in the Frumkin−Derjaguin model was not sufficient to describe the wettability in an oil-wet calcite/nanofluid system. Sensitivity analysis showed that calculating the double-layer interaction using constant potential-constant potential boundaries along with structural hydrophobic forces (non-DLVO interaction) incorporation improved the modeling performance. Considering hydrophobic interactions through linear correlation between hydrophobicity and wettability change for both single-exponential and harmonic equations provided some confidence on the modeling approach. Moreover, structural forces were suggested to be introduced as a combination of hydrophobic/hydrophilic interactions corresponding to stearic acid-coated/silica nanoparticle-covered sites, respectively; which in turn demonstrated a successful prediction of measured wettability data.

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Contribution of different physical forces to the disjoining pressure of a thin water film being pressed by an oil droplet

Cited by 19 publications

References 39 publications

Laplace pressure based disjoining pressure isotherm in non symmetric conditions

Laplace pressure based disjoining pressure isotherm in non symmetric conditions

Asymmetric Electrostatic and Hydrophobic–Hydrophilic Interaction Forces between Mica Surfaces and Silicone Polymer Thin Films

Wettability Alteration Modeling for Oil-Wet Calcite/Silica Nanoparticle System Using Surface Forces Analysis: Contribution of DLVO versus Non-DLVO Interactions

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