title: Hollow Superparamagnetic Microballoons from Lifelike, Self-Directed Pickering Emulsions Based on Patchy Nanoparticles.
abstract: Herein, the formation of hollow microballoons derived from superparamagnetic iron oxide nanoparticles with silica patches is reported. Depending on the experimental conditions, single- or multishelled superparamagnetic microballoons as well as multivesicular structures were obtained. We show how such structural changes follow a lifelike process that is based on self-directing Pickering emulsions. We further demonstrate that the key toward the formation of such complex architectures is the patchy nature of the nanoparticles. Interestingly, no well-defined ordering of patches on the particles surface is required, unlike what theorists formerly predicted. The resultant hollow microballoons may be turned into hollow carbonaceous magnetic microspheres by simple pyrolysis. This opens the way to additional potential applications for such ultralightweight (density: 0.16 g·cm-3) materials.
authors: Fraunhofer Institute for Silicate Research ISC , Neunerplatz 2, 97082 Wuerzburg, Germany.|Department of Chemical Technology of Materials Synthesis, University of Wuerzburg , Roentgenring 11, 97070 Wuerzburg, Germany.
authors: Tim
authors: T
authors: Granath
authors: Institut Jean Lamour, UMR CNRS-Université de Lorraine n°7198, ENSTIB , 27 Rue Philippe Séguin, CS 60036, Epinal 88026 Cedex, France.
authors: Angela
authors: A
authors: Sanchez-Sanchez
authors: Trinity College Dublin, School of Chemistry, School of Physics & CRANN , Dublin 2, Ireland.
authors: Aleksey
authors: A
authors: Shmeliov
authors: Trinity College Dublin, School of Chemistry, School of Physics & CRANN , Dublin 2, Ireland.
authors: Valeria
authors: V
authors: Nicolosi
authors: Institut Jean Lamour, UMR CNRS-Université de Lorraine n°7198, ENSTIB , 27 Rue Philippe Séguin, CS 60036, Epinal 88026 Cedex, France.
authors: Vanessa
authors: V
authors: Fierro
authors: Institut Jean Lamour, UMR CNRS-Université de Lorraine n°7198, ENSTIB , 27 Rue Philippe Séguin, CS 60036, Epinal 88026 Cedex, France.
authors: Alain
authors: A
authors: Celzard
authors: Fraunhofer Institute for Silicate Research ISC , Neunerplatz 2, 97082 Wuerzburg, Germany.|Department of Chemical Technology of Materials Synthesis, University of Wuerzburg , Roentgenring 11, 97070 Wuerzburg, Germany.
authors: Karl
authors: K
authors: Mandel
keywords: hollow particles; lifelike structures; microballoons; patchy nanoparticles; self-directed Pickering emulsions