High-saturation magnetization in small nanoparticles of Fe3O4 coated with natural oils
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2020
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Journal of Nanoparticle Research
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The enhancement of nanoparticle’s magnetic
properties with a suitable coating is the main tool to
increase their potential as an effective candidate for
applications in different areas, especially in biomedicine.
In the work here reported, Fe3O4 nanoparticles
coated with natural oils were synthesized by iron (III)
acetylacetonate thermal decomposition and the effects
of the coating on the magnetic properties of these particles
have been investigated. The oils were extracted
from three Amazon fruits seeds: açaí, ucuúba, and
bacaba by CO2 supercritical extraction process, and
the relative percentage composition of fatty acids were
determined by gas chromatography. A systematic study
of crystalline, morphological, and magnetic properties
revealed a saturation magnetization (Ms) enhancement
and high values of the anisotropy constant for Fe3O4
samples when coated with açaí and ucuúba oils, which present a large percentage of saturated total fatty acid.
Our results indicate that nanoparticles with sizes smaller
than around 5 nm present Ms values as high as that
found for bulk Fe3O4 and, consequently, much higher
than Ms values for nanoparticles usually coated with
oleic acid. The nuclear techniques neutron activation
analysis and perturbed angular correlations were used
to better characterize the nanoparticles.
Como referenciar
CORRÊA, BRUNO S.; COSTA, MESSIAS S.; CABRERA-PASCA, GABRIEL A.; SENA, CLEIDILANE; PINTO, RAFAEL H.H.; SILVA, ANA P.S.; CARVALHO JUNIOR, RAUL N.; ISHIDA, LINA; RAMON, JONATHAN G.A.; FREITAS, RAFAEL S.; SAIKI, MITIKO; MATOS, IZABELA T.; CORRÊA, EDUARDO L.; CARBONARI, ARTUR W. High-saturation magnetization in small nanoparticles of Fe3O4 coated with natural oils. Journal of Nanoparticle Research, v. 22, n. 3, p. 1-15, 2020. DOI: 10.1007/s11051-020-4761-5. Disponível em: http://repositorio.ipen.br/handle/123456789/31379. Acesso em: 24 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.