title: Precipitating Sodium Dodecyl Sulfate to Create Ultrastable and Stimulable Foams.
abstract: Ultrastable foams are made very simply by adding salt (NaCl or KCl) to sodium dodecyl sulfate. The addition of high concentrations of salt leads to the precipitation of the surfactant on the bubble surfaces and as crystals in the interstices between the bubbles. As a consequence, the ageing of the foams is stopped to make them stable indefinitely, or until they are heated above the melting temperature of the crystals. The use of KCl is shown to be much more effective than that of NaCl because potassium dodecyl sulfate has a higher melting temperature and faster rates of crystallization. The crystalline structures have been investigated inside the foam using small angle neutron scattering. The larger lattice spacing of the crystals formed with NaCl in comparison with KCl has been evidenced. These simple temperature stimulable foams could have many potential applications.
authors.affiliation: Laboratoire de Physique des Solides, Université Paris Sud, UMR 8502 CNRS, 91405 Orsay (France).|Key Laboratory of Space Applied Physics and Chemistry, Northwestern Polytechnical University (China).
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Laboratoire de Physique des Solides, Université Paris Sud, UMR 8502 CNRS, 91405 Orsay (France).
authors.forename: Alesya
authors.initials: A
authors.lastname: Mikhailovskaya
authors.affiliation: Laboratoire de Physique des Solides, Université Paris Sud, UMR 8502 CNRS, 91405 Orsay (France).
authors.forename: Pavel
authors.initials: P
authors.lastname: Yazhgur
authors.affiliation: Laboratoire des Interfaces Complexes et de l'Organisation Nanométrique, ECE Paris Ecole d'Ingénieurs (France).|Laboratoire Léon Brillouin, CEA Saclay (France).
authors.forename: François
authors.initials: F
authors.lastname: Muller
authors.affiliation: Laboratoire Léon Brillouin, CEA Saclay (France).
authors.forename: Fabrice
authors.initials: F
authors.lastname: Cousin
authors.affiliation: Laboratoire de Physique des Solides, Université Paris Sud, UMR 8502 CNRS, 91405 Orsay (France).
authors.forename: Dominique
authors.initials: D
authors.lastname: Langevin
authors.affiliation: Key Laboratory of Space Applied Physics and Chemistry, Northwestern Polytechnical University (China).
authors.forename: Nan
authors.initials: N
authors.lastname: Wang
authors.affiliation: Laboratoire de Physique des Solides, Université Paris Sud, UMR 8502 CNRS, 91405 Orsay (France). anniina.salonen@u-psud.fr.
authors.forename: Anniina
authors.initials: A
authors.lastname: Salonen
keywords: crystal engineering; foams; materials science; salt effect; sodium dodecyl sulfate