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

Coşkun, Mustafa and Can, Musa Mutlu and Coşkun, Özlem Duyar and Korkmaz, Mustafa and Fırat, Tezer (2012) Surface anisotropy change of CoFe2O4 nanoparticles depending on thickness of coated SiO2 shell. Journal of Nanoparticle Research, 14 (10). ISSN 1388-0764 (Print) 1572-896X (Online)

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Official URL: http://dx.doi.org/10.1007/s11051-012-1197-6

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 x 10(5) J/m(3) for TEOS amount higher than 1.5 mL.

Item Type:Article
Additional Information:Article Number: 1197
Uncontrolled Keywords:Dipolar interaction; Magnetic anisotropy; Ferrite nanoparticles; SiO2 shell
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Q Science > QD Chemistry
T Technology > T Technology (General) > T174.7 Nanotechnology
ID Code:21007
Deposited By:Musa Mutlu Can
Deposited On:27 Nov 2012 10:09
Last Modified:27 Nov 2012 10:09

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