A study of oleic acid-based hydrothermal preparation of CoFe.sub.2./sub.O.sub.4./sub. nanoparticles

0367606 - FZÚ 2012 RIV NL eng J - Journal Article
Repko, A. - Nižňanský, D. - Poltierová Vejpravová, Jana
A study of oleic acid-based hydrothermal preparation of CoFe₂O₄ nanoparticles.
Journal of Nanoparticle Research. Roč. 13, č. 10 (2011), s. 5021-5031. ISSN 1388-0764. E-ISSN 1572-896X
Institutional research plan: CEZ:AV0Z10100520
Keywords : cobalt ferrite * hydrothermal synthesis * magnetic particles * sperparamagnetism
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.287, year: 2011

Nearly monodisperse, well crystalline, superparamagnetic CoFe2O4 nanoparticles with diameter of 6 nm were synthesized in oleic acid-water-pentanol system at 180 _C. Hydrothermal procedure, as an efficient and environment friendly alternative to organic decomposition methods, was investigated by variation of reaction conditions, and the particle formation mechanism was finally proposed (i.e., hydrolysis of metal oleates in organic phase, with size of the particles (5-8 nm) controlled by polarity-driven precipitation into water phase). As-prepared particles were hydrophobic due to coating by oleic acid. Further modification with dimercaptosuccinic acid led to water-dispersible particles with hydrodynamic diameter of 20 nm. Prepared particles were investigated by TEM, XRD, ICP-AES, light scattering, SQUID magnetometry, and Mossbauer spectroscopy.
Permanent Link: http://hdl.handle.net/11104/0202212