Abstract

Metal ferrite (MFe2O4, with M = Fe, Mn, Co Ni Cu, Zn) nanoparticles were synthesized by processing metal oxide sols in a coordinating environment The sols were prepared by forced hydrolysis of the starting metal nitrates, in the presence of acetylacetone for avoiding precipitation Two different processing routes were investigated In the first, the sol was injected into a hot (160 degrees C) solution of dodecylamine in tetradecene In the second route the Injection environment was constituted by pure dodec ylamine heated at the same temperature The precipitate from the first route was heat-treated in air at various temperatures, from 200 to 500 degrees C The redispersible nanoparticles from the second route were annealed in oleylamine at temperatures up to 220 degrees C In the first case, crystallization was obtained only after heat-treatment at 500 degrees C, while 220 degrees C was sufficient for crystallizing 1 he nanoparticles dispersed in oleylamine The samples from the two routes were investigated by X-ray diffraction and transmission electron microscopy/electron energy loss spectroscopy in the case system of NiFe2O4 The product from the first route, after heating at 200 degrees C, was a disordered material, with a broad size distribution of aggregates and Ni depletion regions The product from the second route was constituted by discrete nanoparticles with the correct cation stoichiometry The interpretation of the results allowed concluding that obtaining simple structural reorganization in nanosized volumes is a key factor for crystallization under mild conditions.

Autore Pugliese

• Epifani Mauro Salvatore

Tutti gli autori

• Epifani M.; Arbiol J.; Andreu T.; Morante J.R.

Titolo volume/Rivista

Crystal growth & design

Anno di pubblicazione

2010

ISSN

1528-7483

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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