On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFMG |
Texto Completo: | http://dx.doi.org/10.21575/25254782rmetg2020vol5n61339 http://hdl.handle.net/1843/42921 |
Resumo: | Nanocrystalline NiFe2O4 particles prepared by chemical co-precipitation method were studied using magnetic measurements, 57Fe Mössbauer spectroscopy, X-ray diffraction, and transmission electron microscopy. Fits to Mössbauer spectra, in the range of 4.2 K – 300 K, were done using spin hamiltonians to describe both the electronic and nuclear interactions, a model of superparamagnetic relaxation of two levels (spin ½) and stochastic theory, a log-normal particle size distribution function as well as a dependency of the magnetic transition temperature and the anisotropy constant on particle diameter. We have used evolutionary strategies to fit the more complex Mössbauer spectra line shapes. The nanoparticles have an average size of 7 nm and exhibit superparamagnetism at room temperature. The saturation magnetization (Ms) at 4.2 K was determined from M vs. 1/H plots by extrapolating the value of magnetizations to infinite fields, to 24.21 emu/g and coercivity to 3.15 kOe. A magnetic anisotropy energy constant (K) 1.9´105 J/m3, at 4.2 K, were calculated from magnetization measurements. The synthesis, characterization, and functionalization of magnetic nanoparticles is a highly active area of current research located at the interface between materials science, biotechnology, and medicine. Superparamagnetic iron oxides nanoparticles have unique physical properties and have emerged as a new class of diagnostic probes for multimodal tracking and as contrast agents for magnetic resonance imaging (MRI). |
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2022-07-05T15:16:09Z2022-07-05T15:16:09Z202056287-01287-13http://dx.doi.org/10.21575/25254782rmetg2020vol5n613392525-4782http://hdl.handle.net/1843/42921Nanocrystalline NiFe2O4 particles prepared by chemical co-precipitation method were studied using magnetic measurements, 57Fe Mössbauer spectroscopy, X-ray diffraction, and transmission electron microscopy. Fits to Mössbauer spectra, in the range of 4.2 K – 300 K, were done using spin hamiltonians to describe both the electronic and nuclear interactions, a model of superparamagnetic relaxation of two levels (spin ½) and stochastic theory, a log-normal particle size distribution function as well as a dependency of the magnetic transition temperature and the anisotropy constant on particle diameter. We have used evolutionary strategies to fit the more complex Mössbauer spectra line shapes. The nanoparticles have an average size of 7 nm and exhibit superparamagnetism at room temperature. The saturation magnetization (Ms) at 4.2 K was determined from M vs. 1/H plots by extrapolating the value of magnetizations to infinite fields, to 24.21 emu/g and coercivity to 3.15 kOe. A magnetic anisotropy energy constant (K) 1.9´105 J/m3, at 4.2 K, were calculated from magnetization measurements. The synthesis, characterization, and functionalization of magnetic nanoparticles is a highly active area of current research located at the interface between materials science, biotechnology, and medicine. Superparamagnetic iron oxides nanoparticles have unique physical properties and have emerged as a new class of diagnostic probes for multimodal tracking and as contrast agents for magnetic resonance imaging (MRI).Partículas nanocristalinas de NiFe2O4 preparadas pelo método de co-precipitação química foram estudadas usando-se medidas magnéticas, espectroscopia Mössbauer de 57Fe, difração de raios-X e microscopia eletrônica de transmissão. Ajustes de espectro Mössbauer, na faixa de 4,2 K – 300 K, foram feitos utilizando-se hamiltonianos de spin para descrever as interações eletrônicas e nucleares, um modelo de relaxação superparamagnética de dois níveis (spin 1/2) e teoria estocástica, função distribuição de tamanho de partículas log-normal, bem como uma dependência da temperatura de transição magnética e da constante de anisotropia dependendo do diâmetro das partículas. Usamos estratégias evolutivas para ajustar as formas mais complexas das linhas de espectro Mössbauer. As nanopartículas têm um tamanho médio de 7 nm e exibem superparamagnetismo à temperatura ambiente. A magnetização de saturação (Ms) a 4,2 K foi determinada a partir de plotagens de M vs. 1=H, extrapolando o valor das magnetizações para campos infinitos, para 24,21 emu/g e coercividade para 3,15 kOe. Uma constante de energia de anisotropia magnética (K) 1,9 × 105 J/m3, a 4,2 K, foi calculada a partir de medidas de magnetização. A síntese, caracterização e funcionalização de nanopartículas magnéticas é uma área altamente ativa de pesquisa atual localizada na interface entre ciência dos materiais, biotecnologia e medicina. Nanopartículas de óxidos de ferro superparamagnéticos têm propriedades físicas únicas e emergiram como uma nova classe de sondas de diagnóstico para rastreamento multimodal e como agentes de contraste para ressonância magnética (RM).Outra AgênciaengUniversidade Federal de Minas GeraisUFMGBrasilICA - INSTITUTO DE CIÊNCIAS AGRÁRIASRevista Mundi Engenharia, Tecnologia e GestãoNanopartículasMossbauer, Espectroscopia deMicroscopia eletrônicaOperadores hamiltonianosRessonância magnéticaOn spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitationSobre ajustes por hamiltoniano de spin de espectros Mössbauer de nanopartículas de NiFe2O4 sintetizadas por co-precipitaçãoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttps://periodicos.ifpr.edu.br/index.php?journal=MundiETG&page=article&op=view&path%5B%5D=1339José Higino Dias FilhoJorge Luis López AguilarAdriana Silva de AlbuquerqueRenato Dourado MaiaWesley de Oliveira BarbosaErnando Campos FerreiraFellipe Silva PereiraKátia Ferreira Guimarães Benficainfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGORIGINALOn spin hamiltonian fits to mössbauer spectra of nife2o4 nanoparticles synthesized by co-precipitation.pdfOn spin hamiltonian fits to mössbauer spectra of nife2o4 nanoparticles synthesized by co-precipitation.pdfapplication/pdf556214https://repositorio.ufmg.br/bitstream/1843/42921/2/On%20spin%20hamiltonian%20fits%20to%20m%c3%b6ssbauer%20spectra%20of%20nife2o4%20nanoparticles%20synthesized%20by%20co-precipitation.pdf3c126280aa271a489b9a70b24b429708MD52LICENSELicense.txtLicense.txttext/plain; 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dc.title.pt_BR.fl_str_mv |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation |
dc.title.alternative.pt_BR.fl_str_mv |
Sobre ajustes por hamiltoniano de spin de espectros Mössbauer de nanopartículas de NiFe2O4 sintetizadas por co-precipitação |
title |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation |
spellingShingle |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation José Higino Dias Filho Nanopartículas Mossbauer, Espectroscopia de Microscopia eletrônica Operadores hamiltonianos Ressonância magnética |
title_short |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation |
title_full |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation |
title_fullStr |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation |
title_full_unstemmed |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation |
title_sort |
On spin hamiltonian fits to Mössbauer spectra of NiFe2O4 nanoparticles synthesized by co-precipitation |
author |
José Higino Dias Filho |
author_facet |
José Higino Dias Filho Jorge Luis López Aguilar Adriana Silva de Albuquerque Renato Dourado Maia Wesley de Oliveira Barbosa Ernando Campos Ferreira Fellipe Silva Pereira Kátia Ferreira Guimarães Benfica |
author_role |
author |
author2 |
Jorge Luis López Aguilar Adriana Silva de Albuquerque Renato Dourado Maia Wesley de Oliveira Barbosa Ernando Campos Ferreira Fellipe Silva Pereira Kátia Ferreira Guimarães Benfica |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
José Higino Dias Filho Jorge Luis López Aguilar Adriana Silva de Albuquerque Renato Dourado Maia Wesley de Oliveira Barbosa Ernando Campos Ferreira Fellipe Silva Pereira Kátia Ferreira Guimarães Benfica |
dc.subject.other.pt_BR.fl_str_mv |
Nanopartículas Mossbauer, Espectroscopia de Microscopia eletrônica Operadores hamiltonianos Ressonância magnética |
topic |
Nanopartículas Mossbauer, Espectroscopia de Microscopia eletrônica Operadores hamiltonianos Ressonância magnética |
description |
Nanocrystalline NiFe2O4 particles prepared by chemical co-precipitation method were studied using magnetic measurements, 57Fe Mössbauer spectroscopy, X-ray diffraction, and transmission electron microscopy. Fits to Mössbauer spectra, in the range of 4.2 K – 300 K, were done using spin hamiltonians to describe both the electronic and nuclear interactions, a model of superparamagnetic relaxation of two levels (spin ½) and stochastic theory, a log-normal particle size distribution function as well as a dependency of the magnetic transition temperature and the anisotropy constant on particle diameter. We have used evolutionary strategies to fit the more complex Mössbauer spectra line shapes. The nanoparticles have an average size of 7 nm and exhibit superparamagnetism at room temperature. The saturation magnetization (Ms) at 4.2 K was determined from M vs. 1/H plots by extrapolating the value of magnetizations to infinite fields, to 24.21 emu/g and coercivity to 3.15 kOe. A magnetic anisotropy energy constant (K) 1.9´105 J/m3, at 4.2 K, were calculated from magnetization measurements. The synthesis, characterization, and functionalization of magnetic nanoparticles is a highly active area of current research located at the interface between materials science, biotechnology, and medicine. Superparamagnetic iron oxides nanoparticles have unique physical properties and have emerged as a new class of diagnostic probes for multimodal tracking and as contrast agents for magnetic resonance imaging (MRI). |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020 |
dc.date.accessioned.fl_str_mv |
2022-07-05T15:16:09Z |
dc.date.available.fl_str_mv |
2022-07-05T15:16:09Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1843/42921 |
dc.identifier.doi.pt_BR.fl_str_mv |
http://dx.doi.org/10.21575/25254782rmetg2020vol5n61339 |
dc.identifier.issn.pt_BR.fl_str_mv |
2525-4782 |
url |
http://dx.doi.org/10.21575/25254782rmetg2020vol5n61339 http://hdl.handle.net/1843/42921 |
identifier_str_mv |
2525-4782 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Revista Mundi Engenharia, Tecnologia e Gestão |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Minas Gerais |
dc.publisher.initials.fl_str_mv |
UFMG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
ICA - INSTITUTO DE CIÊNCIAS AGRÁRIAS |
publisher.none.fl_str_mv |
Universidade Federal de Minas Gerais |
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reponame:Repositório Institucional da UFMG instname:Universidade Federal de Minas Gerais (UFMG) instacron:UFMG |
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Universidade Federal de Minas Gerais (UFMG) |
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UFMG |
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UFMG |
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Repositório Institucional da UFMG |
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Repositório Institucional da UFMG |
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