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Generation and Rupture of Thin Liquid Films

Lundi 14 novembre 2016 14:00 - Duree : 1 heure
Lieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat

Orateur : Lorène CHAMPOUGNY (Laboratoire Gulliver, ESPCI & CNRS, Paris)

The ephemeral beauty of soap films is not only a source of wonder and poetic inspiration, but also conceals fundamental scientific questions, which are at the heart of various applications, ranging from shampoo formulation to oil recovery. In this seminar, I will present recent results shedding light on how the macroscopic properties of a soap film (e.g., its thickness, its lifetime…) can be affected by the physical-chemical properties of the surfactants used to stabilize it. First, I will introduce a stationary model describing the generation of vertical soap films, under the assumption of insoluble surfactants. In this case, the stationary film thickness is controlled by both the generation velocity and the film surface elasticity. It turns out that the model successfully describes experimental data for soluble surfactants, at least when adsorption is slow enough. The second part of the talk will be devoted to the time evolution – i.e. the drainage and rupture – of thin films pulled from a liquid bath, in the simplified case of pure liquids. A non-stationary lubrication model is solved, allowing us to predict the lifetime of such films. The predictions are found in quantitative agreement with experimental data obtained with silicone oils in a wide range of viscosities and film generation velocities. Finally, if time permits, I will discuss some results on how surfactant concentration affects the break-up of hemispherical soap bubbles at the surface of a liquid pool, which is a system somewhat closer to real foams.

Contact : philippe.marmottant@univ-grenoble-alpes.fr

Discipline évènement : (Physique)
Entité organisatrice : (LIPhy)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Mat. Molle/grise)
Site de l'évènement : Domaine Universitaire de St Martin d’Hères

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