Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato
Ano de defesa: | 2012 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Goiás
|
Programa de Pós-Graduação: |
Programa de Pós-graduação em Fisica (IF)
|
Departamento: |
Instituto de Física - IF (RG)
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.bc.ufg.br/tede/handle/tede/8164 |
Resumo: | This work investigated the magneto-thermal properties of manganese ferrite-based nanoparticles. The nanosctructures were synthesized by the coprecipitation method. Three samples were studied, namely: non passivated (2A), passivated (2B), and passivated with citrate coating molecules (2B cit). The particles were characterized by x-ray diffraction (XRD), transmission eléctron microscopy (TEM), vibrating sample magnetometer (VSM) and electron magnetic resonance (EMR). The non-coated samples showed similar diameter and saturation magnetization values, while the citrate-coated sample showed striking diferente values. In particular, the 2B cit sample showed lower values of particle size (determined from Scherrer relation), saturation magnetization and magnetic anisotropy. Those results corroborate with a core-shell nanoparticle model. The magnetic hyperthermia studies, perfomed around 300kHz, revealed that sample 2B had a higher magneto-thermal effiency when compared with the 2B cit one. Dynamic hysteresis curves, obtained within the linear response regime, were capable to explian qualitatively the experimental data. The phenomena was related to a lower magnetic anisotropy for the 2B cit nanoparticles. In addition, the biocompatible magnetic colloid (2B cit) showed SAR values around 50 W/g of MnFe 2 O 4 at the high field limit. However, differently from results reported in the literature, based upon magnetite/maghemite nanoparticles, saturation is achieved at a lower magnetic field amplitude. This suggest that this type of material has great biomedical potential for low-field magnetic hyperthermia applications, which might be necessary in order to inhibit harmful eddy currents inside the patient’s body. |
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Bakuzis, Andris Figueiroahttp://lattes.cnpq.br/3477269475651042Bakuzis, Andris FigueiroaSilva, Sebastião William daPelegrini, Fernandohttp://lattes.cnpq.br/2380461809468588Zufelato, Nícholas2018-02-15T12:55:26Z2012-05-31ZUFELATO, Nícholas. Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato. 2012. 86 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2012.http://repositorio.bc.ufg.br/tede/handle/tede/8164This work investigated the magneto-thermal properties of manganese ferrite-based nanoparticles. The nanosctructures were synthesized by the coprecipitation method. Three samples were studied, namely: non passivated (2A), passivated (2B), and passivated with citrate coating molecules (2B cit). The particles were characterized by x-ray diffraction (XRD), transmission eléctron microscopy (TEM), vibrating sample magnetometer (VSM) and electron magnetic resonance (EMR). The non-coated samples showed similar diameter and saturation magnetization values, while the citrate-coated sample showed striking diferente values. In particular, the 2B cit sample showed lower values of particle size (determined from Scherrer relation), saturation magnetization and magnetic anisotropy. Those results corroborate with a core-shell nanoparticle model. The magnetic hyperthermia studies, perfomed around 300kHz, revealed that sample 2B had a higher magneto-thermal effiency when compared with the 2B cit one. Dynamic hysteresis curves, obtained within the linear response regime, were capable to explian qualitatively the experimental data. The phenomena was related to a lower magnetic anisotropy for the 2B cit nanoparticles. In addition, the biocompatible magnetic colloid (2B cit) showed SAR values around 50 W/g of MnFe 2 O 4 at the high field limit. However, differently from results reported in the literature, based upon magnetite/maghemite nanoparticles, saturation is achieved at a lower magnetic field amplitude. This suggest that this type of material has great biomedical potential for low-field magnetic hyperthermia applications, which might be necessary in order to inhibit harmful eddy currents inside the patient’s body.Neste trabalho investigamos as propriedades magneto-térmicas de nanopartículas à base de ferrita de manganês. As nanopartículas foram sintetizadas pelo método de coprecipitação. Três amostras foram investigadas, são elas: nanopartículas não passivadas (2A), passivadas (2B) e passivadas recobertas com moléculas de citrato (2B cit). As nanoestruturas foram caracterizadas por difração de raios-X (DRX). microscopia eletrônica de transmissão (TEM), magnetometria de amostra vibrante (VSM) e ressonância magnética eletrônica (RME). As amostras não recobertas apresentaram valores de diâmetro e magnetização de saturação semelhantes, enquanto que uma significativa alteração foi evidenciada na amostra recoberta. Esta amostra (2B cit) apresentou valores de diâmetro (utilizando a relação de Scherrer), constante de anisotropia e magnetização menores que as não recobertas. Tais resultados corroboram para a formação de uma nanopartícula do tipo core-shell. Os estudos de magnetohipertermia, realizados em torno de 300kHz, revelaram, ainda, que a amostra 2B apresenta uma eficiência magneto-térmica bem maior que a 2B cit. Curvas de histerese dinâmica, usando a teoria do regime linear, foram capazes de explicar qualitativamente tais resultados. O fenômeno foi explicado pela menor anisotropia magnética da amostra 2B cit. Adicionalmente, o fluido magnético biocompatível (amostra 2B cit) apresentou um SAR em torno de 50 W/g de MnFe 2 O 4 no limite de alto campo. Entretanto, diferentemente de outras amostras da literatura à base de magnetita/maguemita, a saturação foi alcançada em baixa amplitude de campo magnético. Isto sugere, que esta amostra, possui grande potencial biomédico em aplicações de hipertermia magnética com baixa amplitude de campo, as quais são desejáveis para inibir possíveis correntes parasitas em tecidos sadios.Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2018-02-15T12:23:24Z No. of bitstreams: 2 Dissertação - Nícholas Zufelato - 2012.pdf: 2835862 bytes, checksum: 9d1149314ab7a9df2da0b228aeeed37b (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-02-15T12:55:26Z (GMT) No. of bitstreams: 2 Dissertação - Nícholas Zufelato - 2012.pdf: 2835862 bytes, checksum: 9d1149314ab7a9df2da0b228aeeed37b (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-02-15T12:55:26Z (GMT). No. of bitstreams: 2 Dissertação - Nícholas Zufelato - 2012.pdf: 2835862 bytes, checksum: 9d1149314ab7a9df2da0b228aeeed37b (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2012-05-31Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESapplication/pdfporUniversidade Federal de GoiásPrograma de Pós-graduação em Fisica (IF)UFGBrasilInstituto de Física - IF (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessHipertermia magnéticaFerritaManganêsCitratoMagnetic hypertermiaFerriteManganeseCitrateCIENCIAS EXATAS E DA TERRA::FISICAHipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citratoMagnetic hyperthermia of nanoparticles based on manganese ferrite: effect of surface coating of nanoparticles by citrate moleculesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis3162138865744262028600600600600-4029658853652049306-83271462965037459292075167498588264571reponame:Biblioteca Digital de Teses e Dissertações da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; 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dc.title.eng.fl_str_mv |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato |
dc.title.alternative.eng.fl_str_mv |
Magnetic hyperthermia of nanoparticles based on manganese ferrite: effect of surface coating of nanoparticles by citrate molecules |
title |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato |
spellingShingle |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato Zufelato, Nícholas Hipertermia magnética Ferrita Manganês Citrato Magnetic hypertermia Ferrite Manganese Citrate CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato |
title_full |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato |
title_fullStr |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato |
title_full_unstemmed |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato |
title_sort |
Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato |
author |
Zufelato, Nícholas |
author_facet |
Zufelato, Nícholas |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Bakuzis, Andris Figueiroa |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/3477269475651042 |
dc.contributor.referee1.fl_str_mv |
Bakuzis, Andris Figueiroa |
dc.contributor.referee2.fl_str_mv |
Silva, Sebastião William da |
dc.contributor.referee3.fl_str_mv |
Pelegrini, Fernando |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/2380461809468588 |
dc.contributor.author.fl_str_mv |
Zufelato, Nícholas |
contributor_str_mv |
Bakuzis, Andris Figueiroa Bakuzis, Andris Figueiroa Silva, Sebastião William da Pelegrini, Fernando |
dc.subject.por.fl_str_mv |
Hipertermia magnética Ferrita Manganês Citrato |
topic |
Hipertermia magnética Ferrita Manganês Citrato Magnetic hypertermia Ferrite Manganese Citrate CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Magnetic hypertermia Ferrite Manganese Citrate |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
This work investigated the magneto-thermal properties of manganese ferrite-based nanoparticles. The nanosctructures were synthesized by the coprecipitation method. Three samples were studied, namely: non passivated (2A), passivated (2B), and passivated with citrate coating molecules (2B cit). The particles were characterized by x-ray diffraction (XRD), transmission eléctron microscopy (TEM), vibrating sample magnetometer (VSM) and electron magnetic resonance (EMR). The non-coated samples showed similar diameter and saturation magnetization values, while the citrate-coated sample showed striking diferente values. In particular, the 2B cit sample showed lower values of particle size (determined from Scherrer relation), saturation magnetization and magnetic anisotropy. Those results corroborate with a core-shell nanoparticle model. The magnetic hyperthermia studies, perfomed around 300kHz, revealed that sample 2B had a higher magneto-thermal effiency when compared with the 2B cit one. Dynamic hysteresis curves, obtained within the linear response regime, were capable to explian qualitatively the experimental data. The phenomena was related to a lower magnetic anisotropy for the 2B cit nanoparticles. In addition, the biocompatible magnetic colloid (2B cit) showed SAR values around 50 W/g of MnFe 2 O 4 at the high field limit. However, differently from results reported in the literature, based upon magnetite/maghemite nanoparticles, saturation is achieved at a lower magnetic field amplitude. This suggest that this type of material has great biomedical potential for low-field magnetic hyperthermia applications, which might be necessary in order to inhibit harmful eddy currents inside the patient’s body. |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012-05-31 |
dc.date.accessioned.fl_str_mv |
2018-02-15T12:55:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
ZUFELATO, Nícholas. Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato. 2012. 86 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2012. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/8164 |
identifier_str_mv |
ZUFELATO, Nícholas. Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato. 2012. 86 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2012. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/8164 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
3162138865744262028 |
dc.relation.confidence.fl_str_mv |
600 600 600 600 |
dc.relation.department.fl_str_mv |
-4029658853652049306 |
dc.relation.cnpq.fl_str_mv |
-8327146296503745929 |
dc.relation.sponsorship.fl_str_mv |
2075167498588264571 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Fisica (IF) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Instituto de Física - IF (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
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Biblioteca Digital de Teses e Dissertações da UFG - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
tesesdissertacoes.bc@ufg.br ||tesesdissertacoes.bc@ufg.br |
_version_ |
1800237197818855424 |