Use of magnetic resonance to investigate magnetic fluids for transformers application
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Data
2012-12
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Resumo
Magnetic resonance (MR) was used to investigate two magnetic fluid (MF) samples containing nanosized (average 3 nm in diameter) iron
oxide particles suspended in insulating mineral and vegetal oils. The MR spectra were analyzed using two Lorentzian-like components.
Analysis of the temperature (T) dependence of the resonance field (HR) indicates that the lower-field (higher-field) resonance line accounts
for monomers (chain-like units). The solid-liquid phase transition of the MF samples, taking place around the melting point of the insulating
oil (solvent), is indicated by a cusp in the HR £ T curve, which is more pronounced for the lower-field resonance line component. This
finding was associated to a higher reorientation of the monomer’s magnetic moment upon melting of the MF sample.
Descrição
Palavras-chave
Transformer, Magnetic fluid, Magnetic resonance, Nanoparticle, Trasformador, Fluido magnético, Resonancia magnética, Nanopartículas
Citação
LEITE, E.S. et al. Use of magnetic resonance to investigate magnetic fluids for transformers application. Revista Mexicana de Física, Coyoacán, v. 58, n. 2, p. 249-252, Dec. 2012.