Generation of soap films with instantaneously adsorbed surfactants: concentration-dependent film thinning - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Colloids and Surfaces A: Physicochemical and Engineering Aspects Année : 2015

Generation of soap films with instantaneously adsorbed surfactants: concentration-dependent film thinning

Jacopo Seiwert

Résumé

In this theoretical work, we predict the steady state thickness of soap films pulled from a bath of surfactants. Assuming simplified thermodynamical properties for the surfactants, we compute the interfacial stresses by taking explicitly into account surfactant convection along the film. We make no assumption on interfacial rheology: the rigidification of the interfaces results entirely from confinement and depletion effects. Two main approximations are used: the concentration of surfactants is supposed homogeneous within the thickness of the film, and at equilibrium with the adsorbed layer. With these hypotheses, we show that the thickness of the film follows Frankel's law at low capillary numbers, and that deviations occur at higher pulling velocities. We study the dependence of the film thickness with the characteristics of the surfactant used and especially with its initial concentration, and we show that our predictions are compatible with available data by Saulnier and coworkers.
Fichier principal
Vignette du fichier
Generation of soap films with instantaneously adsorbed.pdf (1005.33 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01179522 , version 1 (04-11-2015)

Identifiants

Citer

Jacopo Seiwert, Isabelle Cantat. Generation of soap films with instantaneously adsorbed surfactants: concentration-dependent film thinning. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015, 473, pp.2-10. ⟨10.1016/j.colsurfa.2014.11.022⟩. ⟨hal-01179522⟩
83 Consultations
204 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More