Magnetite-Maghemite Nanoparticles in the 5-15 nm Range: Correlating the Core-Shell Composition and the Surface Structure to the Magnetic Properties. A Total Scattering Study (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Magnetite-Maghemite Nanoparticles in the 5-15 nm Range: Correlating the Core-Shell Composition and the Surface Structure to the Magnetic Properties. A Total Scattering Study (Articolo in rivista) (literal)

Anno

• 2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1021/cm403360f (literal)

Alternative label

• Frison, Ruggero; Cernuto, Giuseppe; Cervellino, Antonio; Zaharko, Oksana; Colonna, Gian Maria; Guagliardi, Antonietta; Masciocchi, Norberto (2013)
  Magnetite-Maghemite Nanoparticles in the 5-15 nm Range: Correlating the Core-Shell Composition and the Surface Structure to the Magnetic Properties. A Total Scattering Study
  in Chemistry of materials; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Frison, Ruggero; Cernuto, Giuseppe; Cervellino, Antonio; Zaharko, Oksana; Colonna, Gian Maria; Guagliardi, Antonietta; Masciocchi, Norberto (literal)

Pagina inizio

• 4820 (literal)

Pagina fine

• 4827 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

• http://pubs.acs.org/journal/cmatex (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 25 (literal)

Rivista

• Chemistry of materials (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 8 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

• 23 (literal)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Consiglio Nazionale delle Ricerche (CNR); To Sca Lab; University of Insubria; Paul Scherrer Institute; Paul Scherrer Institute; Innovhub (literal)

Titolo

• Magnetite-Maghemite Nanoparticles in the 5-15 nm Range: Correlating the Core-Shell Composition and the Surface Structure to the Magnetic Properties. A Total Scattering Study (literal)

Abstract

• Very small superparamagnetic iron oxide nanoparticles were characterized by innovative synchrotron X-ray total scattering methods and Debye function analysis. Using the information from both Bragg and diffuse scattering, size-dependent core-shell magnetite-maghemite compositions and full size (number- and mass-based) distributions were derived within a coherent approach. The magnetite core radii in 10 nm sized NPs well match the magnetic domain sizes and show a clear correlation to the saturation magnetization values, while the oxidized shells seem to be magnetically silent. Very broad superstructure peaks likely produced by the polycrystalline nature of the surface layers were experimentally detected in room temperature oxidized samples. Effective magnetic anisotropy constants, derived by taking the knowledge of the full size-distributions into account, show an inverse dependence on the NPs size, witnessing a major surface contribution. Finally, an additional amorphous component was uncovered within the diffuse scattering of the \"ordered\" magnetite-maghemite NPs. Under the hypothesis that this material may form an external dead layer, an additional thickness varying between 0.3 and 1.0 nm should be added to the overall core-shell NPs size. (literal)

Editore

• ACS, American chemical society (Editore)

Prodotto di

• Sviluppo di metodi e caratterizzazione di materiali cristallini alla nano, micro e mesoscala (PM.P04.011.001) (Modulo)
• Institute of Crystallography (IC) (Istituto)

Autore CNR

• ANTONIETTA GUAGLIARDI (Unità di personale interno)

Insieme di parole chiave

• Keywords of "Magnetite-Maghemite Nanoparticles in the 5-15 nm Range: Correlating the Core-Shell Composition and the Surface Structure to the Magnetic Properties. A Total Scattering Study" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of Crystallography (IC) (Istituto)
• Sviluppo di metodi e caratterizzazione di materiali cristallini alla nano, micro e mesoscala (PM.P04.011.001) (Modulo)

Autore CNR di

• ANTONIETTA GUAGLIARDI (Unità di personale interno)
• http://www.cnr.it/ontology/cnr/individuo/unitaDiPersonaleEsterno/ID23047

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Chemistry of materials (Rivista)

Editore di

• ACS, American chemical society (Editore)

Insieme di parole chiave di

• Keywords of "Magnetite-Maghemite Nanoparticles in the 5-15 nm Range: Correlating the Core-Shell Composition and the Surface Structure to the Magnetic Properties. A Total Scattering Study" (Insieme di parole chiave)