title: Incorporation of negatively charged iron oxide nanoparticles in the shell of anionic surfactant-stabilized microbubbles: The effect of NaCl concentration.
abstract: We report on the key effect of NaCl for the stabilization of nanoparticle-decorated microbubbles coated by an anionic perfluoroalkylated phosphate C10F21(CH2)2OP(O)(OH)2 surfactant and negatively charged iron oxide nanoparticles. We show that hollow microspheres with shells of 100-200 nm in thickness can be stabilized even at high pH when a strong ionic force is required to screen the negative charges. Due to the more drastic conditions required to stabilize the hollow microspheres, they appear to be stable enough to be deposited on a surface and dried. That can be a simple way to fabricate porous ceramics.
authors.affiliation: Institut Charles Sadron (ICS) CNRS - Université de Strasbourg (UPR 22), 23 rue du Loess, BP 84047, 67034 Strasbourg cedex 2, France; Institut de Physique et Chimie des Matériaux de Strasbourg IPCMS, UMR 7504 CNRS-ECPM-Université de Strasbourg, 23 rue du Loess BP 43, 67034 Strasbourg cedex 2, France.
authors.forename: Artem
authors.initials: A
authors.lastname: Kovalenko
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg IPCMS, UMR 7504 CNRS-ECPM-Université de Strasbourg, 23 rue du Loess BP 43, 67034 Strasbourg cedex 2, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Jouhannaud
authors.affiliation: Institut Charles Sadron (ICS) CNRS - Université de Strasbourg (UPR 22), 23 rue du Loess, BP 84047, 67034 Strasbourg cedex 2, France.
authors.forename: Prasad
authors.initials: P
authors.lastname: Polavarapu
authors.affiliation: Institut Charles Sadron (ICS) CNRS - Université de Strasbourg (UPR 22), 23 rue du Loess, BP 84047, 67034 Strasbourg cedex 2, France.
authors.forename: Marie Pierre
authors.initials: MP
authors.lastname: Krafft
authors.affiliation: Institut Charles Sadron (ICS) CNRS - Université de Strasbourg (UPR 22), 23 rue du Loess, BP 84047, 67034 Strasbourg cedex 2, France.
authors.forename: Gilles
authors.initials: G
authors.lastname: Waton
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg IPCMS, UMR 7504 CNRS-ECPM-Université de Strasbourg, 23 rue du Loess BP 43, 67034 Strasbourg cedex 2, France. Electronic address: genevieve.pourroy@ipcms.unistra.fr.
authors.forename: Geneviève
authors.initials: G
authors.lastname: Pourroy
keywords: Bi-modal contrast agent; Hollow microspheres; Magnetic microbubbles; Magnetic nanoparticles; Perfluoroalkyl surfactant; Salt effect