Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes

Autores
Gardey Merino, María
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión aceptada
Descripción
In this work, two new gel-combustion routes for the synthesis of Al2O3 nanopowders with aspartic acid as fuel are presented. The first route is a conventional stoichiometric process, while the second one is a non-stoichiometric, pH-controlled process. These routes were compared with similar synthesis procedures using glycine as fuel, which are well-known in the literature. The samples were calcined in air at different temperatures, in a range of 600–1200 ◦C. They were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and BET specific surface area. Different phases were obtained depending on the calcination temperature: amorphous, (metastable) or (stable). The amorphous-to- transition was found for calcination temperatures in the range of 700–900 ◦C, while the -to- one was observed for calcination temperatures of 1100–1200 ◦C. The retention of the metastable phase is probably due to a crystallite size effect. It transforms to the phase after the crystallite size increases over a critical size during the calcination process at 1200 ◦C. The highest BET specific surface areas were obtained for both nitrate–aspartic acid routes proposed in this work, reaching values of about 50 m2/g.
Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza; Argentina
Peer Reviewed
Fuente
Journal of Alloys and Compounds (495) : 578–582 (2010)
Materia
Nanostructured materials, Oxide materials, X-ray diffraction
Nivel de accesibilidad
acceso abierto
Condiciones de uso
2023-12-15T13:40:20Z
Repositorio
Repositorio Institucional Abierto (UTN)
Institución
Universidad Tecnológica Nacional
OAI Identificador
oai:ria.utn.edu.ar:20.500.12272/9223
Acceder
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network_acronym_str RIAUTN
repository_id_str a
network_name_str Repositorio Institucional Abierto (UTN)
spelling Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routesGardey Merino, MaríaNanostructured materials, Oxide materials, X-ray diffractionIn this work, two new gel-combustion routes for the synthesis of Al2O3 nanopowders with aspartic acid as fuel are presented. The first route is a conventional stoichiometric process, while the second one is a non-stoichiometric, pH-controlled process. These routes were compared with similar synthesis procedures using glycine as fuel, which are well-known in the literature. The samples were calcined in air at different temperatures, in a range of 600–1200 ◦C. They were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and BET specific surface area. Different phases were obtained depending on the calcination temperature: amorphous, (metastable) or (stable). The amorphous-to- transition was found for calcination temperatures in the range of 700–900 ◦C, while the -to- one was observed for calcination temperatures of 1100–1200 ◦C. The retention of the metastable phase is probably due to a crystallite size effect. It transforms to the phase after the crystallite size increases over a critical size during the calcination process at 1200 ◦C. The highest BET specific surface areas were obtained for both nitrate–aspartic acid routes proposed in this work, reaching values of about 50 m2/g.Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza; ArgentinaPeer Reviewed2023-12-15T13:40:20Z2023-12-15T13:40:20Z2009-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articulopdfapplication/pdfJournal of Alloys and Compoundshttp://hdl.handle.net/20.500.12272/9223https://dx.doi.org/10.1016/j.jallcom.2009.10.042Journal of Alloys and Compounds (495) : 578–582 (2010)reponame:Repositorio Institucional Abierto (UTN)instname:Universidad Tecnológica Nacionalenginfo:eu-repo/semantics/openAccess2023-12-15T13:40:20Zhttp://creativecommons.org/publicdomain/zero/1.0/CC0 1.0 UniversalUniversidad Tecnológica Nacional. Facultad Regional MendozaAtribución2026-09-24T12:46:08Zoai:ria.utn.edu.ar:20.500.12272/9223instacron:UTNInstitucionalhttp://ria.utn.edu.ar/Universidad públicaNo correspondehttp://ria.utn.edu.ar/oaigestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:a2026-09-24 12:46:09.397Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacionalfalse
dc.title.none.fl_str_mv Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
title Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
spellingShingle Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
Gardey Merino, María
Nanostructured materials, Oxide materials, X-ray diffraction
title_short Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
title_full Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
title_fullStr Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
title_full_unstemmed Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
title_sort Nanostructured aluminium oxide powders obtained by aspartic acid–nitrate gel-combustion routes
dc.creator.none.fl_str_mv Gardey Merino, María
author Gardey Merino, María
author_facet Gardey Merino, María
author_role author
dc.subject.none.fl_str_mv Nanostructured materials, Oxide materials, X-ray diffraction
topic Nanostructured materials, Oxide materials, X-ray diffraction
dc.description.none.fl_txt_mv In this work, two new gel-combustion routes for the synthesis of Al2O3 nanopowders with aspartic acid as fuel are presented. The first route is a conventional stoichiometric process, while the second one is a non-stoichiometric, pH-controlled process. These routes were compared with similar synthesis procedures using glycine as fuel, which are well-known in the literature. The samples were calcined in air at different temperatures, in a range of 600–1200 ◦C. They were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and BET specific surface area. Different phases were obtained depending on the calcination temperature: amorphous, (metastable) or (stable). The amorphous-to- transition was found for calcination temperatures in the range of 700–900 ◦C, while the -to- one was observed for calcination temperatures of 1100–1200 ◦C. The retention of the metastable phase is probably due to a crystallite size effect. It transforms to the phase after the crystallite size increases over a critical size during the calcination process at 1200 ◦C. The highest BET specific surface areas were obtained for both nitrate–aspartic acid routes proposed in this work, reaching values of about 50 m2/g.
Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza; Argentina
Peer Reviewed
description In this work, two new gel-combustion routes for the synthesis of Al2O3 nanopowders with aspartic acid as fuel are presented. The first route is a conventional stoichiometric process, while the second one is a non-stoichiometric, pH-controlled process. These routes were compared with similar synthesis procedures using glycine as fuel, which are well-known in the literature. The samples were calcined in air at different temperatures, in a range of 600–1200 ◦C. They were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and BET specific surface area. Different phases were obtained depending on the calcination temperature: amorphous, (metastable) or (stable). The amorphous-to- transition was found for calcination temperatures in the range of 700–900 ◦C, while the -to- one was observed for calcination temperatures of 1100–1200 ◦C. The retention of the metastable phase is probably due to a crystallite size effect. It transforms to the phase after the crystallite size increases over a critical size during the calcination process at 1200 ◦C. The highest BET specific surface areas were obtained for both nitrate–aspartic acid routes proposed in this work, reaching values of about 50 m2/g.
publishDate 2009
dc.date.none.fl_str_mv 2009-10-01
2023-12-15T13:40:20Z
2023-12-15T13:40:20Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv Journal of Alloys and Compounds
http://hdl.handle.net/20.500.12272/9223
https://dx.doi.org/10.1016/j.jallcom.2009.10.042
identifier_str_mv Journal of Alloys and Compounds
url http://hdl.handle.net/20.500.12272/9223
https://dx.doi.org/10.1016/j.jallcom.2009.10.042
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
2023-12-15T13:40:20Z
http://creativecommons.org/publicdomain/zero/1.0/
CC0 1.0 Universal
Universidad Tecnológica Nacional. Facultad Regional Mendoza
Atribución
eu_rights_str_mv openAccess
rights_invalid_str_mv 2023-12-15T13:40:20Z
http://creativecommons.org/publicdomain/zero/1.0/
CC0 1.0 Universal
Universidad Tecnológica Nacional. Facultad Regional Mendoza
Atribución
dc.format.none.fl_str_mv pdf
application/pdf
dc.source.none.fl_str_mv Journal of Alloys and Compounds (495) : 578–582 (2010)
reponame:Repositorio Institucional Abierto (UTN)
instname:Universidad Tecnológica Nacional
reponame_str Repositorio Institucional Abierto (UTN)
collection Repositorio Institucional Abierto (UTN)
instname_str Universidad Tecnológica Nacional
repository.name.fl_str_mv Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacional
repository.mail.fl_str_mv gestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.ar
_version_ 1877230916291526656
score 13.24418

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