Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da Universidade Federal do Ceará (UFC) |
Texto Completo: | http://www.repositorio.ufc.br/handle/riufc/67327 |
Resumo: | This work deals with the synthesis of superparamagnetic cobalt ferrite (CoFe2O4) nanoparticles, via a sol-gel method that uses gelatin as an organic precursor and a rapid thermal processing furnace with halogen lamps as a heat source. TEM, HRTEM, XRD, VSM and Mössbauer spectroscopy measurements were performed, at room temperature, to characterize the samples. Nanoparticles with an average size of 5–10 nm and microstrain of the order of 10−4–10−3 were obtained. Magnetic hardening was also observed with increased nanoparticle size, in addition to an increase in the anisotropy constant, which ranged from 1.7 to 4.7·106 erg/cm3. The saturation magnetization decreased with decreasing size due to the formation of a magnetically dead layer on the surface (thickness = 0.6–0.7 nm). The Mössbauer spectra showed an increase in the superparamagnetic phase for samples with smaller nanoparticles and less dispersion. |
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Repositório Institucional da Universidade Federal do Ceará (UFC) |
repository_id_str |
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Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lampsNanoparticlesCobalt ferriteSuperparamagneticSol–gel preparationHalogen lamps furnaceThis work deals with the synthesis of superparamagnetic cobalt ferrite (CoFe2O4) nanoparticles, via a sol-gel method that uses gelatin as an organic precursor and a rapid thermal processing furnace with halogen lamps as a heat source. TEM, HRTEM, XRD, VSM and Mössbauer spectroscopy measurements were performed, at room temperature, to characterize the samples. Nanoparticles with an average size of 5–10 nm and microstrain of the order of 10−4–10−3 were obtained. Magnetic hardening was also observed with increased nanoparticle size, in addition to an increase in the anisotropy constant, which ranged from 1.7 to 4.7·106 erg/cm3. The saturation magnetization decreased with decreasing size due to the formation of a magnetically dead layer on the surface (thickness = 0.6–0.7 nm). The Mössbauer spectra showed an increase in the superparamagnetic phase for samples with smaller nanoparticles and less dispersion.Journal of Sol-Gel Science and Technology2022-07-21T15:37:36Z2022-07-21T15:37:36Z2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfMAIA, André de Oliveira Girão et al. Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps. Journal of Sol-Gel Science and Technology, [s. l.], v. 99, p. 527-533, 2021.1573-484http://www.repositorio.ufc.br/handle/riufc/67327Maia, André de Oliveira GirãoOliveira, Francisco Gilvane Sampaio deCordeiro, Carlos Henrique NascimentoTeixeira, Edwalder SilvaSilva, Erandir Brasil daSoares, João MariaVasconcelos, Igor Frota deSasaki, José MarcosDumelow, Thomasengreponame:Repositório Institucional da Universidade Federal do Ceará (UFC)instname:Universidade Federal do Ceará (UFC)instacron:UFCinfo:eu-repo/semantics/openAccess2022-07-21T17:03:37Zoai:repositorio.ufc.br:riufc/67327Repositório InstitucionalPUBhttp://www.repositorio.ufc.br/ri-oai/requestbu@ufc.br || repositorio@ufc.bropendoar:2024-09-11T18:16:36.527091Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)false |
dc.title.none.fl_str_mv |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps |
title |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps |
spellingShingle |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps Maia, André de Oliveira Girão Nanoparticles Cobalt ferrite Superparamagnetic Sol–gel preparation Halogen lamps furnace |
title_short |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps |
title_full |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps |
title_fullStr |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps |
title_full_unstemmed |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps |
title_sort |
Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps |
author |
Maia, André de Oliveira Girão |
author_facet |
Maia, André de Oliveira Girão Oliveira, Francisco Gilvane Sampaio de Cordeiro, Carlos Henrique Nascimento Teixeira, Edwalder Silva Silva, Erandir Brasil da Soares, João Maria Vasconcelos, Igor Frota de Sasaki, José Marcos Dumelow, Thomas |
author_role |
author |
author2 |
Oliveira, Francisco Gilvane Sampaio de Cordeiro, Carlos Henrique Nascimento Teixeira, Edwalder Silva Silva, Erandir Brasil da Soares, João Maria Vasconcelos, Igor Frota de Sasaki, José Marcos Dumelow, Thomas |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Maia, André de Oliveira Girão Oliveira, Francisco Gilvane Sampaio de Cordeiro, Carlos Henrique Nascimento Teixeira, Edwalder Silva Silva, Erandir Brasil da Soares, João Maria Vasconcelos, Igor Frota de Sasaki, José Marcos Dumelow, Thomas |
dc.subject.por.fl_str_mv |
Nanoparticles Cobalt ferrite Superparamagnetic Sol–gel preparation Halogen lamps furnace |
topic |
Nanoparticles Cobalt ferrite Superparamagnetic Sol–gel preparation Halogen lamps furnace |
description |
This work deals with the synthesis of superparamagnetic cobalt ferrite (CoFe2O4) nanoparticles, via a sol-gel method that uses gelatin as an organic precursor and a rapid thermal processing furnace with halogen lamps as a heat source. TEM, HRTEM, XRD, VSM and Mössbauer spectroscopy measurements were performed, at room temperature, to characterize the samples. Nanoparticles with an average size of 5–10 nm and microstrain of the order of 10−4–10−3 were obtained. Magnetic hardening was also observed with increased nanoparticle size, in addition to an increase in the anisotropy constant, which ranged from 1.7 to 4.7·106 erg/cm3. The saturation magnetization decreased with decreasing size due to the formation of a magnetically dead layer on the surface (thickness = 0.6–0.7 nm). The Mössbauer spectra showed an increase in the superparamagnetic phase for samples with smaller nanoparticles and less dispersion. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021 2022-07-21T15:37:36Z 2022-07-21T15:37:36Z |
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 |
MAIA, André de Oliveira Girão et al. Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps. Journal of Sol-Gel Science and Technology, [s. l.], v. 99, p. 527-533, 2021. 1573-484 http://www.repositorio.ufc.br/handle/riufc/67327 |
identifier_str_mv |
MAIA, André de Oliveira Girão et al. Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps. Journal of Sol-Gel Science and Technology, [s. l.], v. 99, p. 527-533, 2021. 1573-484 |
url |
http://www.repositorio.ufc.br/handle/riufc/67327 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Journal of Sol-Gel Science and Technology |
publisher.none.fl_str_mv |
Journal of Sol-Gel Science and Technology |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da Universidade Federal do Ceará (UFC) instname:Universidade Federal do Ceará (UFC) instacron:UFC |
instname_str |
Universidade Federal do Ceará (UFC) |
instacron_str |
UFC |
institution |
UFC |
reponame_str |
Repositório Institucional da Universidade Federal do Ceará (UFC) |
collection |
Repositório Institucional da Universidade Federal do Ceará (UFC) |
repository.name.fl_str_mv |
Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC) |
repository.mail.fl_str_mv |
bu@ufc.br || repositorio@ufc.br |
_version_ |
1813028734040539136 |