Can natural oils improve the properties of magnetic nanoparticles?
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2019
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ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 64th
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The use of nanoparticles coated with different materials have been studied by many
researchers to improve the quality of nanomaterials for biomedical applications such as
controlled drug delivery, image contrast and treatment of cancer by magnetic
hyperthermia [1]. In this work, we used oils extracted from ucuúba (Virola surinamensis),
bacaba (Oenocarpus bacaba Mart.) and açaí (Euterpe oleracea Mart.) to coat Fe3O4
nanoparticles. The ucuúba, bacaba and açaí are native trees of the Amazon forest, whose
oils are rich in fatty acids, such as lauric, myristic, steatic, oleic, palmitic, and linoleic
acid, with different proportions. These pure oils, free of solvents, were obtained by the
extraction method with carbon dioxide in the supercritical state [2], and then added during
the synthesis process of iron oxide nanoparticles by thermal decomposition method [3].
The results of X-ray diffraction confirmed the formation of Fe3O4 single phase. The
average size around 3 nm and spherical morphology of the magnetite nanoparticles was
determined by transmission electron microscopy. The study of magnetic properties
revealed a saturation magnetization (Ms) enhancement and high values of the anisotropy
constant for Fe3O4 samples when coated with açaí (91.4 emu.g-1; 4.6 105 J.m-3) and
ucuúba (80.6 emu.g-1; 9.3 105 J.m-3) oils, which present a large percentage of saturated
total fatty acid. The results indicate that nanoparticles with sizes smaller than around 5
nm present Ms values as high as those found in bulk Fe3O4 and higher than those usually
obtained for nanoparticles coated with oleic acid [4]. The neutron activation analysis
(NAA) nuclear technique was used to determine with high accuracy the mass of Fe in the
Fe3O4 core of nanoparticles in order to normalize the magnetization values [5]. These
results show that natural oils have a great potential to produce stable and quality
nanoparticles as compared with conventional coated.
Como referenciar
CORREA, B.S.; COSTA, M.S.; CABRERA-PASCA, G.; SENA, C.; PINTO, R.H.; CARVALHO JUNIOR, R.N.; FREITAS, R.S.; SAIKI, M.; CORREA, E.; CARBONARI, A.W. Can natural oils improve the properties of magnetic nanoparticles?: A systematic study of iron oxide nanoparticles coated with oils from Amazon fruits. In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 64th, November 4-8, 2019, Las Vegas, Nevada, USA. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/31027. Acesso em: 30 Dec 2025.
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.