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Journal of Nanoparticle Research
Erschienen in: Journal of Nanoparticle Research 10/2012

01.10.2012 | Research Paper

Surface anisotropy change of CoFe2O4 nanoparticles depending on thickness of coated SiO2 shell

verfasst von: Mustafa Coşkun, Musa Mutlu Can, Özlem Duyar Coşkun, Mustafa Korkmaz, Tezer Fırat

Erschienen in: Journal of Nanoparticle Research | Ausgabe 10/2012

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Abstract

We systematically investigated the effective surface anisotropy of CoFe2O4 nanoparticles dependant on the thickness of SiO2 shell. XRD (X-ray powder diffraction) patterns and TEM (transmission electron microscopy) micrographs were used to investigate the structure of particles and thickness of SiO2 shell, respectively. The thicknesses of SiO2 shell with 5.41 nm on CoFe2O4 nanoparticles were increased up to 14.04 ± 0.05 nm by changing the amount of added TEOS by, 0.10, 0.25, 0.50, 1.00, 1.50, and 2.50 mL. The increase of the SiO2 thickness shell decreased the effective anisotropy due to decline the effectiveness of the dipolar magnetostatic interactions, determined from Vogel–Fulcher equation, between the particles. The declines in the Keff values stabled at around 3.76 ± 0.11 × 105 J/m3 for TEOS amount higher than 1.5 mL.
Vorheriger Artikel The influence of Al(OH)3-coated graphene oxide on improved thermal conductivity and maintained electrical resistivity of Al2O3/epoxy composites
Nächster Artikel Platinum-modified SiO2 with tubular morphology as efficient membrane-type microreactors for mineralization of formic acid

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Metadaten
Titel
Surface anisotropy change of CoFe2O4 nanoparticles depending on thickness of coated SiO2 shell
verfasst von
Mustafa Coşkun
Musa Mutlu Can
Özlem Duyar Coşkun
Mustafa Korkmaz
Tezer Fırat
Publikationsdatum
01.10.2012
Verlag
Springer Netherlands
Erschienen in
Journal of Nanoparticle Research / Ausgabe 10/2012
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI
https://doi.org/10.1007/s11051-012-1197-6

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