Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Materials research (São Carlos. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000100107 |
Resumo: | In this paper, magnesium aluminate spinels were prepared by microwave-assisted combustion, using urea as fuel. In order to evaluate the effect of the urea excess used in the synthesis, its mass was added in a range of 1.0 to 2.5 times the stoichiometric amount required. The materials produced were characterized by TGA, FTIR, XRF, XRD, BET, SEM and TEM. The results demonstrated that magnesium aluminate spinel was formed in all solids, but the crystallinity degree and the specific surface area increased according to the amount of urea that was used in the synthesis. The use of excess fuel in the preparation was therefore advantageous, since it eliminated the need of the calcination step, at high temperatures, in order to stabilize the spinel phase and improve the crystallinity of the solid. The heat generated in the combustion process was sufficient to develop the formation of a nanocrystalline structure and produce high purity materials, with a save of 99.4% in energy. |
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Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted CombustionMicrowave SynthesisNanocrystalsStructural PropertiesMgAl2O4DRXIn this paper, magnesium aluminate spinels were prepared by microwave-assisted combustion, using urea as fuel. In order to evaluate the effect of the urea excess used in the synthesis, its mass was added in a range of 1.0 to 2.5 times the stoichiometric amount required. The materials produced were characterized by TGA, FTIR, XRF, XRD, BET, SEM and TEM. The results demonstrated that magnesium aluminate spinel was formed in all solids, but the crystallinity degree and the specific surface area increased according to the amount of urea that was used in the synthesis. The use of excess fuel in the preparation was therefore advantageous, since it eliminated the need of the calcination step, at high temperatures, in order to stabilize the spinel phase and improve the crystallinity of the solid. The heat generated in the combustion process was sufficient to develop the formation of a nanocrystalline structure and produce high purity materials, with a save of 99.4% in energy.ABM, ABC, ABPol2018-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000100107Materials Research v.21 n.1 2018reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2017-0189info:eu-repo/semantics/openAccessCarvalho,Luciene SantosMelo,Vitor Rodrigo de Melo eVitor Sobrinho,EledirRuiz,DorisMelo,Dulce Maria de Araújoeng2018-05-11T00:00:00Zoai:scielo:S1516-14392018000100107Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2018-05-11T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion |
title |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion |
spellingShingle |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion Carvalho,Luciene Santos Microwave Synthesis Nanocrystals Structural Properties MgAl2O4 DRX |
title_short |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion |
title_full |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion |
title_fullStr |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion |
title_full_unstemmed |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion |
title_sort |
Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion |
author |
Carvalho,Luciene Santos |
author_facet |
Carvalho,Luciene Santos Melo,Vitor Rodrigo de Melo e Vitor Sobrinho,Eledir Ruiz,Doris Melo,Dulce Maria de Araújo |
author_role |
author |
author2 |
Melo,Vitor Rodrigo de Melo e Vitor Sobrinho,Eledir Ruiz,Doris Melo,Dulce Maria de Araújo |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Carvalho,Luciene Santos Melo,Vitor Rodrigo de Melo e Vitor Sobrinho,Eledir Ruiz,Doris Melo,Dulce Maria de Araújo |
dc.subject.por.fl_str_mv |
Microwave Synthesis Nanocrystals Structural Properties MgAl2O4 DRX |
topic |
Microwave Synthesis Nanocrystals Structural Properties MgAl2O4 DRX |
description |
In this paper, magnesium aluminate spinels were prepared by microwave-assisted combustion, using urea as fuel. In order to evaluate the effect of the urea excess used in the synthesis, its mass was added in a range of 1.0 to 2.5 times the stoichiometric amount required. The materials produced were characterized by TGA, FTIR, XRF, XRD, BET, SEM and TEM. The results demonstrated that magnesium aluminate spinel was formed in all solids, but the crystallinity degree and the specific surface area increased according to the amount of urea that was used in the synthesis. The use of excess fuel in the preparation was therefore advantageous, since it eliminated the need of the calcination step, at high temperatures, in order to stabilize the spinel phase and improve the crystallinity of the solid. The heat generated in the combustion process was sufficient to develop the formation of a nanocrystalline structure and produce high purity materials, with a save of 99.4% in energy. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000100107 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000100107 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1980-5373-mr-2017-0189 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
dc.source.none.fl_str_mv |
Materials Research v.21 n.1 2018 reponame:Materials research (São Carlos. Online) instname:Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
instname_str |
Universidade Federal de São Carlos (UFSCAR) |
instacron_str |
ABM ABC ABPOL |
institution |
ABM ABC ABPOL |
reponame_str |
Materials research (São Carlos. Online) |
collection |
Materials research (São Carlos. Online) |
repository.name.fl_str_mv |
Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR) |
repository.mail.fl_str_mv |
dedz@power.ufscar.br |
_version_ |
1754212672110329856 |