Core/shell hetero-nanostructures of hydrothermally synthesised cobalt and nickel ferrites are shown to exhibit novel magnetic properties. The compositions and phase distributions of homogeneous Co0.5Ni0.5Fe2O4, and core/shell NiFe2O4-Core/ CoFe2O4-Shelland CoFe2O4-Core/ NiFe2O4-Shellnanoparticles (NPs) are confirmed using high-resolution transmission electron microscopy and electron energy loss spectroscopy. SQUID magnetometry investigations demonstrate that, at room temperature, homogeneous Co0.5Ni0.5Fe2O4NPs (∼8 nm in diameter) are in the super-paramagnetic state, the magnetisation of NiFe2O4-Core/CoFe2O4-ShellNPs (∼11 nm in diameter) is partially blocked, whilst CoFe2O4-Core/NiFe2O4- ShellNPs (∼11 nm in diameter) are in a blocked state. In particular, NiFe2O4-Core/CoFe2O4-ShellNPs exhibit twice the out-of-phase χ″ susceptibility of CoFe2O4-Core/NiFe2O4-ShellNPs, being dominated by the magnetisation of the core ferrite phase. Hence, when exposed to a high-frequency magnetic field, it is considered that the high χ″ susceptibility of NiFe2O4-Core/CoFe2O4-ShellNPs will promote large magnetically induced heating effects,making these core/shell NPs strong candidates for hyperthermia applications. © Springer Science+Business Media 2014

Almeida, T., Moro, F., Fay, M., Zhu, Y., Brown, P. (2014). Tuneable magnetic properties of hydrothermally synthesised core/shell CoFe2O4/NiFe2O4and NiFe2O4/CoFe2O4nanoparticles. JOURNAL OF NANOPARTICLE RESEARCH, 16(5) [10.1007/s11051-014-2395-1].

Tuneable magnetic properties of hydrothermally synthesised core/shell CoFe2O4/NiFe2O4and NiFe2O4/CoFe2O4nanoparticles

Moro, Fabrizio;
2014

Abstract

Core/shell hetero-nanostructures of hydrothermally synthesised cobalt and nickel ferrites are shown to exhibit novel magnetic properties. The compositions and phase distributions of homogeneous Co0.5Ni0.5Fe2O4, and core/shell NiFe2O4-Core/ CoFe2O4-Shelland CoFe2O4-Core/ NiFe2O4-Shellnanoparticles (NPs) are confirmed using high-resolution transmission electron microscopy and electron energy loss spectroscopy. SQUID magnetometry investigations demonstrate that, at room temperature, homogeneous Co0.5Ni0.5Fe2O4NPs (∼8 nm in diameter) are in the super-paramagnetic state, the magnetisation of NiFe2O4-Core/CoFe2O4-ShellNPs (∼11 nm in diameter) is partially blocked, whilst CoFe2O4-Core/NiFe2O4- ShellNPs (∼11 nm in diameter) are in a blocked state. In particular, NiFe2O4-Core/CoFe2O4-ShellNPs exhibit twice the out-of-phase χ″ susceptibility of CoFe2O4-Core/NiFe2O4-ShellNPs, being dominated by the magnetisation of the core ferrite phase. Hence, when exposed to a high-frequency magnetic field, it is considered that the high χ″ susceptibility of NiFe2O4-Core/CoFe2O4-ShellNPs will promote large magnetically induced heating effects,making these core/shell NPs strong candidates for hyperthermia applications. © Springer Science+Business Media 2014
Articolo in rivista - Articolo scientifico
Core/shell nanoparticles; Hydrothermal synthesis; Magnetic properties; Spinel ferrites; Bioengineering; Chemistry (all); Atomic and Molecular Physics, and Optics; Modeling and Simulation; Materials Science (all); Condensed Matter Physics
English
2014
16
5
2395
none
Almeida, T., Moro, F., Fay, M., Zhu, Y., Brown, P. (2014). Tuneable magnetic properties of hydrothermally synthesised core/shell CoFe2O4/NiFe2O4and NiFe2O4/CoFe2O4nanoparticles. JOURNAL OF NANOPARTICLE RESEARCH, 16(5) [10.1007/s11051-014-2395-1].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/210611
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