Responsive aqueous foams.
Remarkable properties have emerged recently for aqueous foams, including ultrastability and responsiveness. Responsive aqueous foams refer to foams for which the stability can be switched between stable and unstable states with a change in environment or with external stimuli. Responsive foams have been obtained from various foam stabilizers, such as surfactants, proteins, polymers, and particles, and with various stimuli. Different strategies have been developed to design this type of soft material. We briefly review the two main approaches used to obtain responsive foams. The first approach is based on the responsiveness of the interfacial layer surrounding the gas bubbles, which leads to responsive foams. The second approach is based on modifications that occur in the aqueous phase inside the foam liquid channels to tune the foam stability. We will highlight the most sophisticated approaches, which use light, temperature, and magnetic fields and lead to switchable foam stability.
UR1268 Biopolymères Interactions Assemblages, Institut National de la Recherche Agronomique, Rue de la Géraudière, F-44316 Nantes cedex 3 (France). anne-laure.fameau@nantes.inra.fr.
Anne-Laure
AL
Fameau
Adrian
A
Carl
Arnaud
A
Saint-Jalmes
Regine
R
von Klitzing
D004655:Emulsions / Q000737:chemistry*; D008027:Light; D060526:Magnetic Fields; D011108:Polymers / Q000737:chemistry; D011506:Proteins / Q000737:chemistry; D012212:Rheology; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry*
D004655:Emulsions; D011108:Polymers; D011506:Proteins; D013501:Surface-Active Agents; D014867:Water
emulsions; foams; magnetic properties; stimuli-responsive; surfactants