Production and study of nanoparticles magnetic properties by hyperfine interactions
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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In the past years nanotechnology was highlighted as a quick growing field, with
many applications in science and technology including information storage, drug delivery
and medical images, in which gadolinium-based nanoparticles (NPs) have been
studied as contrast agent for magnetic resonance image. On the other hand erbium
oxide NPs present potential for many applications due to their optical, electrical and
photoluminescence properties, and can be used in display monitors, carbon nanotubes
for "green" chemistry and in bioimaging, and iron-based NPs have been studied for
application in hyperthermia due to its superparamagnetic properties. At the Hyperfine
Interactions Laboratory (LIH) NPs are synthesized by thermal decomposition and
co-precipitation. Structural characterization is made using X-ray diffraction (XRD)
and transmission electron microscopy (TEM) and magnetic properties are studied by
magnetization, both at partner laboratories, and perturbed angular correlation (PAC)
spectroscopy using 111In(111Cd) as probe nuclei at LIH. PAC spectroscopy is based on
the angular correlation between nuclear radiations emitted by radioactive probe nuclei,
which is a well-established method in nuclear spectroscopy. Perturbation occurs
in this correlation by electromagnetic interactions external to the nucleus when it is
inserted in a material, which can provide information on the electronic distribution
of the neighborhood. In this work, an important material was investigated by PAC
spectroscopy using 111In, which decays to 111Cd by electron capture, as probe nuclei.
Results have shown that NPs produced by thermal decomposition present narrow
size distribution, with average size of 5 nm. On the other hand, results related to
NPs produced by co-precipitation have shown that NPs don’t have a homogeneity in
size and shape distribution.
Como referenciar
NASCIMENTO, N.M.; CORREA, E.L.; BOSCH-SANTOS, B.; MATOS, I.T.; CABRERA-PASCA, G.A.; CARBONARI, A.W. Production and study of nanoparticles magnetic properties by hyperfine interactions. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 81-81. Disponível em: http://repositorio.ipen.br/handle/123456789/28783. Acesso em: 28 Feb 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.