Use of magnetic resonance to investigate magnetic fluids for transformers application

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dc.creatorLeite, Eliane Silva
dc.creatorSkeff Neto, K.
dc.creatorSartoratto, Patrícia Pommé Confessori
dc.creatorViali, Wesley Renato
dc.creatorMorais, P. C.
dc.date.accessioned2018-10-22T12:35:56Z
dc.date.available2018-10-22T12:35:56Z
dc.date.issued2012-12
dc.description.abstractMagnetic 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.pt_BR
dc.description.resumoResonancia magn´etica (RM) fue utilizada para investigar dos muestras de fluidos magn´eticos (FM) conteniendo nanopart´ıculas (di´ametro medio de 3 nm) de ´oxido de hierro suspendidas en un aislante mineral y aceite vegetal. El espectro de RM fue analizado usando dos componentes de forma lorentziana. El an´alisis de la dependencia de la temperatura (T) con el campo resonante (HR) indica que a bajos campos (campos superiores) la linea de resonancia produce mon´omeros (unidades tipo cadena). En la transici´on de fase solida-liquido las muestras de FM pr´oximo al punto de descongelamiento del aceite aislante (solvente), es indicado por la c´uspide en la curva HR £ T, que es m´as pronunciada para la componente de la linea de resonancia a bajos campos. Este ajuste fue asociado para la alta reorientaci ´on de los momentos magn´eticos de los mon´omeros encima del punto de descongelamiento de las muestras de FM.pt_BR
dc.identifier.citationLEITE, 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.pt_BR
dc.identifier.issn0035-001X
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/16228
dc.language.isoengpt_BR
dc.publisher.countryMexicopt_BR
dc.publisher.departmentInstituto de Química - IQ (RG)pt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectTransformerpt_BR
dc.subjectMagnetic fluidpt_BR
dc.subjectMagnetic resonancept_BR
dc.subjectNanoparticlept_BR
dc.subjectTrasformadorpt_BR
dc.subjectFluido magnéticopt_BR
dc.subjectResonancia magnéticapt_BR
dc.subjectNanopartículaspt_BR
dc.titleUse of magnetic resonance to investigate magnetic fluids for transformers applicationpt_BR
dc.typeArtigopt_BR

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