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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/5958

Title: Humectacion: conceptos y cuestiones basicas [Wetting: concepts and basic features]
Authors: Velarde, M.G.
Starov, Victor
Issue Date: 2009
Publisher: © Royal Spanish Physics Society
Citation: VELARDE, M.G. and STAROV, V., 2009. Humectacion: conceptos y cuestiones basicas [Wetting: concepts and basic features]. Revesta Espanola de Fisica, 23(4), pp. 61-74
Abstract: Resumen Cuando se coloca una gota sobre una superficie sólida plana y lisa puede que no moje o que se esparza mojando parcial o totalmente al sólido, cuya caracterización se da mediante el correspondiente valor de un ángulo de conjunción, en equilibrio termodinámico (y consecuentemente mecánico). Introduciendo fuerzas superficiales se calcula este ángulo en función de la presión (isoterma) de Derjaguin, minimizando la adecuada energía libre de exceso de Gibbs. La clásica ecuación de Young para el ángulo de conjunción es recordada y su validez conceptual delimitada. Se discute también la posible histéresis que da lugar a un ángulo de conjunción de avance y otro de retroceso aun en el caso de una superficie sólida homogénea, debido a la peculiar forma de la presión (isoterma) de Derjaguin. Abstract For a small sessile liquid drop on a plane, smooth solid substrate three possibilities exist: complete wetting, partial wetting and non wetting. They are characterized by their corresponding (thermodynamic and hence mechanical) equilibrium contact angle. The latter is given here as a function of Derjaguin’s (disjoining or conjoining) pressure (isotherm) using the surface forces, and minimizing the appropriate excess Gibbs free energy. Young’s classic contact angle equation is recalled and its conceptual validity is assessed. Contact angle (advancing and receding) hysteresis is also discussed pointing out its appearance even for homogeneous solid surfaces.
Description: This article was published in the serial, Revista Espanola de Fisica © Royal Spanish Physics Society].
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/5958
ISSN: 0213-862X
Appears in Collections:Published Articles (Chemical Engineering)

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