Effects of nanostructure and dipolar interactions on magnetohyperthermia in iron oxide nanoparticles
J. M. Orozco-Henao, D. F. Coral, D. Muraca, O. Moscoso-Londoño, P. Mendoza Zélis, M. B. Fernandez van Raap, S. K. Sharma, K. R. Pirota and M. Knobel
ARTIGO
Inglês
Agradecimentos: This work has been supported by the Brazilian agencies FAPESP, FAPEMA, and CNPq. We thank the TEM facilities of the Brazilian Nanotechnology National Laboratory (LNNano) at Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)/MCTI (Grants 14825 and 14827). O.M.-L. acknowledges...
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Agradecimentos: This work has been supported by the Brazilian agencies FAPESP, FAPEMA, and CNPq. We thank the TEM facilities of the Brazilian Nanotechnology National Laboratory (LNNano) at Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)/MCTI (Grants 14825 and 14827). O.M.-L. acknowledges FAPESP Grant 2014/26672-8, and D.M. acknowledges FAPESP Grant 2011/01235-6. SAXS spectra were measured at the beamline of the Brazilian Synchrotron Light Laboratory (LNLS) at CNPEM/MCTI under Proposal D11A-SAXS2 (Grant 14355). D.M. and J.M.O.-H. thank Maria Eugenia Fortes Brollo for help during the synthesis. This work has been funded by CONICET (Grant PIP 00720) and UNLP-X11/680 grants of Argentina. P.M.Z. and M.B.F.v.R. are members of IFLP-CONICET, and D.F.C. is a fellow of CONICET, Argentina
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Abstract: Magnetohyperthermia properties of magnetic nanoparticle colloids are strongly affected by their intrinsic magnetic properties and dipolar interactions among themselves. The intrinsic magnetic properties are related to the nanoparticle (NP) size, geometry, phase composition, magnetic...
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Abstract: Magnetohyperthermia properties of magnetic nanoparticle colloids are strongly affected by their intrinsic magnetic properties and dipolar interactions among themselves. The intrinsic magnetic properties are related to the nanoparticle (NP) size, geometry, phase composition, magnetic anisotropy, and saturation magnetization. The dipole-dipole interactions are determined by colloid nanoparticle concentrations and the possible existence of clustering on the colloidal suspension. Here we have observed that oxygen atmosphere and pressure changes during the final stage of thermal decomposition are critical to modify the size of the iron oxide NPs from 8 to near 20 nm, and consequently their overall magnetic properties. Size-dependent magnetic parameters such as anisotropy, magnetic moment per particle, blocking temperature, and dipolar interaction energy were inferred using different phenomenological approaches. A detailed magnetohyperthermia analysis was performed by applying the linear response theory. A good correlation between experimental and theoretical specific absorption rate values was obtained for a frequency of 260 kHz and applied field of 52 kA/m. These results were observed for the different sizes of nanoparticles, and disagreement between the experimental results and the model increases at lower frequencies
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FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2011/01235-6; 2014/26672-8 ; 2011/01235-6
FUNDAÇÃO DE AMPARO À PESQUISA E AO DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO DO MARANHÃO - FAPEMA
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
Fechado
Muraca, Diego, 1978-
Autor
Knobel, Marcelo, 1968-
Autor
Effects of nanostructure and dipolar interactions on magnetohyperthermia in iron oxide nanoparticles
J. M. Orozco-Henao, D. F. Coral, D. Muraca, O. Moscoso-Londoño, P. Mendoza Zélis, M. B. Fernandez van Raap, S. K. Sharma, K. R. Pirota and M. Knobel
Effects of nanostructure and dipolar interactions on magnetohyperthermia in iron oxide nanoparticles
J. M. Orozco-Henao, D. F. Coral, D. Muraca, O. Moscoso-Londoño, P. Mendoza Zélis, M. B. Fernandez van Raap, S. K. Sharma, K. R. Pirota and M. Knobel
Fontes
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The journal of physical chemistry. Part C Vol. 120, n. 23 (June, 2016), p. 12796-12809 |