title: Aggregation control of hydrophilic maghemite (gamma-Fe2O3) nanoparticles by surface doping using cerium atoms.
abstract: The high-power ultrasonic irradiation of preformed magnetite (Fe(3)O(4)) nanoparticles in the presence of monoelectronic Ce-containing ceric ammonium nitrate [Ce(IV)(NH(4))(2)(NO(3))(6)] oxidant in MeCOMe afforded hydrophilic 50 nm-sized colloidal, highly stable maghemite (gamma-Fe(2)O(3)) nanoparticles. An "inorganic" Ce atom doping of the NP surface has been proposed in order to rationalize the observed nanoparticle antiaggregation phenomenon. Quite importantly, this method did not require the use of any organic ligand and/or polymer for the passivation of the nanoparticle surface.
authors.affiliation: Nanomaterials Research Center, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel.
authors.forename: Amit H
authors.initials: AH
authors.lastname: Haviv
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Grenèche
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Lellouche
mesh_terms: D002563:Cerium / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D003102:Colloids; D005290:Ferric Compounds; C000499:ferric oxide; D002563:Cerium; C004653:ceric ammonium nitrate