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Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2009

Evaporation of an emulsion trapped in a yield stress fluid

Résumé

The present work deals with emulsions of volatile alkanes in an aqueous clay suspension, Laponite, which forms a yield stress fluid. For a large enough yield stress (i.e. Laponite concentration), the oil droplets are prevented from creaming and the emulsions are thus mechanically stabilized. We have studied the evaporation kinetics of the oil phase of those emulsions in contact with the atmosphere. We show that the evaporation process is characterized by the formation of a sharp front separating the emulsion from a droplet-free Laponite phase, and that the displacement of the front vs. time follows a diffusion law. Experimental data are confronted to a diffusion-controlled model, in the case where the limiting step is the diffusion of the dissolved oil through the aqueous phase. The nature of the alkane, as well as its volume fraction in the emulsion, has been varied.? Quantitative agreement with the model is achieved without any adjustable parameter and we describe the mechanism leading to the formation of a front.
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Dates et versions

hal-00547825 , version 1 (17-12-2010)

Identifiants

  • HAL Id : hal-00547825 , version 1

Citer

Geoffroy Guéna, Joëlle Corde, Sarah Fouilloux, Jean-Baptise d'Espinose, François Lequeux, et al.. Evaporation of an emulsion trapped in a yield stress fluid. European Physical Journal E: Soft matter and biological physics, 2009, 28, pp.463-468. ⟨hal-00547825⟩
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