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- W2092602004 abstract "The effects of a thin liquid film on contact angles are studied using a simplified thermodynamic model. (in this model, the small transition zone between the liquid-vapour interface and the fiat thin liquid film is neglected). A set of mechanical equilibrium conditions have been derived for contact angle systems with a flat thin liquid film. The equilibrium condition at the three-phase intersection explicitly predicts the effects of the film tension, the disjoining pressure and the film thickness, on contact angles. The number of degrees of freedom for a two-component solid-liquid-vapour surface system with a flat thin liquid film is shown to be three, implying the existence of an equation-of-state-type relationship among the solid-liquid interfacial tension, γsl, liquid surface tension, γlv, the disjoining pressure, Π, and the film tension, γf. An approximate, explicit form of such an equation of state has been derived. The combination of this equation of state with the equilibrium condition of the the three-phase intersection can be used to estimate the film tension, γf, and the solid-liquid interfacial tension, γsl, from the measured data for the vapour pressure, Pv, the film thickness, h, the curvature of the liquid-vapour meniscus, J, the liquid surface tension, γlv, and the contact angle, θ. The effect of the thin film on the drop-size dependence of contact angles is also investigated and found to be negligible." @default.
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- W2092602004 date "1991-07-01" @default.
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- W2092602004 title "Thermodynamics of contact angle phenomena in the presence of a thin liquid film" @default.
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- W2092602004 doi "https://doi.org/10.1016/0001-8686(91)80030-n" @default.
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