Liquid core alginate capsules : formation, properties and applications
Lundi 2 décembre 2013 14:00
- Duree : 1 heure
Lieu : Salle des séminaires - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat
Orateur : Nicolas BREMOND (Laboratoire Colloïdes et Matériaux Divisés, ESPCI, Paris)
We have developed a process for creating liquid-core capsules having a thin hydrogel shell that can enclose either oil or aqueous media. The shell results from the gelling of an alginate solution (a natural polymer that turns into gel in presence of divalent cations) after a co-extrusion step. The encapsulation of an aqueous medium within a hydrogel envelope is not as straightforward since all phases are potentially miscible. I will show how mixing can be circumvented by playing with bulk and interfacial physicochemical properties of the various fluids. Then, I will present the features of the hydrogel membrane in terms of permeability and mechanical properties. Finally, I will discuss the use of such objects, especially in biotechnology. Indeed, the possibility to encapsulate cells into such a reservoir having a semi-permeable membrane opens the way to screen cell growth in various three-dimensional environments.
Contact : sigolene.lecuyer@ujf-grenoble.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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