Stabilization of foams by the combined effects of an insoluble gas species and gelation

Abstract : Liquid foams are unstable due to aging processes such as drainage, coalescence or coarsening. Since these processes modify the foam structure, they can be a severe limitation to the elaboration of solid foams with controlled structures inherited from their liquid precursors. Such applications call for a thorough understanding of foam stabilization. Here we study how coarsening can be inhibited by the combined effects of a mixture of gas containing a species insoluble in the foaming solution and of gelation of the foaming solution. We present experiments with model ordered liquid foams and hydrogel foams. They allow us to identify the underlying physical mechanisms of stabilization and their governing parameters, namely the bubble radius R o , the foam shear modulus G and the number Z o of insoluble trapped gas molecules per bubble. We propose a scaling model that predicts the stability diagram of an ideal monodisperse perfectly ordered foam as a function of R o , G and Z o , in qualitative agreement with our data. We show that the domain of stable foams is governed by a characteristic elasto-capillary radius set by the ratio of surface tension to storage modulus.
Type de document :
Article dans une revue
Soft Matter, Royal Society of Chemistry, 2017, 13, pp.6816-6830 〈10.1039/C6SM02191C〉
Liste complète des métadonnées

Littérature citée [42 références]  Voir  Masquer  Télécharger

http://hal.upmc.fr/hal-01596063
Contributeur : Gestionnaire Hal-Upmc <>
Soumis le : mercredi 27 septembre 2017 - 10:55:40
Dernière modification le : jeudi 11 janvier 2018 - 06:27:33
Document(s) archivé(s) le : jeudi 28 décembre 2017 - 12:55:21

Fichier

 Accès restreint
Fichier visible le : 2018-01-31

Connectez-vous pour demander l'accès au fichier

Identifiants

Collections

Citation

Houda Bey, Frederic Wintzenrieth, Olivier Ronsin, Reinhard Höhler, Sylvie Cohen-Addad. Stabilization of foams by the combined effects of an insoluble gas species and gelation . Soft Matter, Royal Society of Chemistry, 2017, 13, pp.6816-6830 〈10.1039/C6SM02191C〉. 〈hal-01596063〉

Partager

Métriques

Consultations de la notice

49