http://www.cnr.it/ontology/cnr/individuo/prodotto/ID274052

Beyond the Effect of Particle Size: Influence of CoFe2O4 Nanoparticle Arrangements on Magnetic Properties (Articolo in rivista)

Type

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

Label

Beyond the Effect of Particle Size: Influence of CoFe2O4 Nanoparticle Arrangements on Magnetic Properties (Articolo in rivista) (literal)

Anno

2013-01-01T00:00:00+01:00 (literal)

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

10.1021/cm303352r (literal)

Alternative label

Peddis, D. and Cannas, C. and Musinu, A. and Ardu, A. and Orru, F. and Fiorani, D. and Laureti, S. and Rinaldi, D. and Muscas, G. and Concas, G. and Piccaluga, G. (2013)
Beyond the Effect of Particle Size: Influence of CoFe2O4 Nanoparticle Arrangements on Magnetic Properties
in Chemistry of materials
(literal)

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

Peddis, D. and Cannas, C. and Musinu, A. and Ardu, A. and Orru, F. and Fiorani, D. and Laureti, S. and Rinaldi, D. and Muscas, G. and Concas, G. and Piccaluga, G. (literal)

Pagina inizio

2005 (literal)

Pagina fine

2013 (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#numeroFascicolo

10 (literal)

Note

ISI Web of Science (WOS) (literal)

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

Peddis, D (Reprint Author), CNR, Ist Struttura Mat, I-00016 Rome, Italy. Peddis, D.; Fiorani, D.; Laureti, S.; Muscas, G., CNR, Ist Struttura Mat, I-00016 Rome, Italy. Cannas, C.; Musinu, A.; Ardu, A.; Orru, F.; Piccaluga, G., Cittadella Univ Monserrato, Univ Cagliari, Dipartimento Sci Chim & Geol, I-09042 Monserrato, Italy. Muscas, G.; Concas, G., Cittadella Univ Monserrato, Univ Cagliari, Dipartimento Fis, I-09042 Bivio Per Sestu, Monserrato, Italy. Rinaldi, D., Univ Politecn Marche, Dipartimento Fis & Ingn Mat & Terr, I-60131 Ancona, Italy. Rinaldi, D., Consorzio Nazl Interuniv Sci Fis Mat CNISM, Rome, Italy. (literal)

Titolo

Beyond the Effect of Particle Size: Influence of CoFe2O4 Nanoparticle Arrangements on Magnetic Properties (literal)

Abstract

This paper focuses on the magnetic properties of CoFe2O4 nanoparticles, discussing the influence of nanoparticles arrangements obtained by different synthesis methods. Using high thermal decomposition (HTD) and direct micellar (DM) routes, three samples of CoFe2O4 nanoparticles with equal primary particle size (similar to 5 nm) were prepared. The HTD method allows one to obtain highly crystalline primary nanoparticles coated by oleic acid organized in a self-assembling arrangement (ACoFe(HTD)). The DM method results to be appropriate to prepare either irregular arrangements (IACoFe(DM)) or spherical iso-oriented nanoporous assemblies (SACoFe(DM)) of primary CoFe2O4 nanocrystals. Despite the same particle size, magnetization measurements of the HTD sample show a tendency toward cubic anisotropy (M-r/M-s approximate to 0.7), while in DM samples, a uniaxial anisotropy (M-r/M-s approximate to 0.4) is observed. The comparison between IACoFe(DM) and SACoFe(DM) samples indicates that the ordering of nanocrystals at the mesoscopic scale induces an increase of the coercive field (mu H-0(c) approximate to 1.17 T -> mu H-0(c) approximate to 1.45 T) and of the reduced remanent magnetization (M-r/M-s approximate to 0.4 -> M-r/M-s approximate to 0.5). The reason for these differences is discussed. In particular, a detailed study on interparticle interactions is carried out, highlighting the influence of the molecular coating and the formation of spherical iso-oriented assemblies. (literal)

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