caa a22 4500 388019271 CHVBK 20180307124919.0 cr unu---uuuuu 161130e199810 xx s 000 0 eng 10.1557/JMR.1998.0407 doi S0884291400046422 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0407 Monodisperse magnetic nanoparticles: Preparation and dispersion in water and oils [Elektronische Daten] Nanometric maghemite and cobalt ferrite particles are chemically synthesized. The process produces particles polydisperse in size. The positive charges of their surface allow one to disperse them in aqueous acidic solutions and to obtain dispersions stabilized through electrostatic repulsions. Increasing acid concentration (in the range 0.1 to 0.5 mol.L−1), interparticles repulsions are screened and phase transitions are induced. Using this phenomenon, we describe a two-step size sorting process, in order to get significant amounts of nanometric monosized particles (with diameters monitored between typically 6 and 13 nm). As the surface of the latter is not modified by the size sorting process, usual procedures are used to disperse them in several aqueous or oily media. Copyright © Materials Research Society 1998 Lefebure S. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France Dubois E. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France Cabuil V. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France Neveu S. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France Massart R. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France Journal of Materials Research Cambridge University Press 13/10(1998-10), 2975-2981 0884-2914 13:10<2975 1998 13 JMR https://doi.org/10.1557/JMR.1998.0407 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0407 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lefebure S. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France NATIONALLICENCE 700 1- Dubois E. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France NATIONALLICENCE 700 1- Cabuil V. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France NATIONALLICENCE 700 1- Neveu S. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France NATIONALLICENCE 700 1- Massart R. Laboratoire Liquides Ioniques et Interfaces Chargées, Equipe "Colloïdes Magnétiques,” Université Pierre et Marie Curie, Paris, France NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/10(1998-10), 2975-2981 0884-2914 13:10<2975 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge