Synthesis of CoFe2O4 superparamagnetic nanoparticles using a rapid thermal processing furnace with halogen lamps

Detalhes bibliográficos
Autor(a) principal: Maia, André de Oliveira Girão
Data de Publicação: 2021
Outros Autores: 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
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.
id UFC-7_6b9e41e483afa9433349ed5e06113a9d
oai_identifier_str oai:repositorio.ufc.br:riufc/67327
network_acronym_str UFC-7
network_name_str Repositório Institucional da Universidade Federal do Ceará (UFC)
repository_id_str
spelling 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