Effect of fuels in combustion synthesis of CoCr2O4 pigments

Autores
Gardey Merino, María
Año de publicación
2021
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The CoCr2O4 is a bluish-green pigment characterized by a high thermal stability, good resistance to atmospheric effects and chemical corrosion [1]. This work is aimed to present the process of production of CoCr2O4 oxide by means of the original one-step stoichiometric combustion method starting from metallic nitrates and four fuels: aspartic acid (Asp) or lysine (Lys) or ethylenediaminetetraacetic acid (Edta) or tris(hydroxymethyl)aminomethane (Tris). In the production of CoCr2O4, once obtained the ashes by combustion processes, they are calcined for 2 hours at 800°C and 1000°C in air. The pigments are characterized by X-ray diffraction (XRD) to determine their crystalline structure, average crystallite size from peak (2 = 36°) using Scherrer equation. The diffraction data were analysed by the Rietveld method, using the FULLPROF refinement program. Additionally, L*a*b* colour parameters of samples were measured, following the CIEL*a*b* method [1]. In addition, the specific object of this paper is to analyse the influence of the crystalline structure on the pigment colour, then, these pigments will be applied to insensitive spectrally selective paints for coloured solar absorbers [2]. The diffractograms of all the pigments calcined at 1000°C (1000°Cpigment) correspond to CoCr2O4 which crystallizes in a cubic spinel structure with space group (No. 227) and a face-centred lattice defined in the cubic Fd- 3തm. In the case of Tris-1000°C pigment, the unit-cell parameter is: a= 8.224 Å. For this model, it was obtained a very good fit between observed graphics and the calculated XRD profiles producing good agreement factors as shown in Fig.1. The average crystallite size ranged between 30 and 50 nm for 1000°C-pigments. In the case of 800°C calcined pigments (800°C-pigments), the stabilized CoCr2O4 structure was also observed but with a lower crystallite size than 1000°C-pigments. Coordinate L* for 1000°C-pigments was lower than the one corresponding to 800°C-pigments. Additionally, coordinate b* is negative for 1000 °C- pigments, indicating a slight blue contribution, while for 800°C-pigments is positive indicating a slight yellow contribution. Probably, the increase of the calcination temperature would cause a higher crystallite size and more solar absorption. In conclusion 1000 °C- pigments are darker than 800°C-pigments and have a major aptitude to be used in spectrally selective paints. It would be necessary to carry out further specific technics to confirm this relation.
Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza, Argentina
Materia
CoCr2O4 pigments, Combustion synthesis, DRX, (TISS) paints.
Nivel de accesibilidad
acceso abierto
Condiciones de uso
CC0 1.0 Universal
Repositorio
Repositorio Institucional Abierto (UTN)
Institución
Universidad Tecnológica Nacional
OAI Identificador
oai:ria.utn.edu.ar:20.500.12272/12860
Acceder
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oai_identifier_str oai:ria.utn.edu.ar:20.500.12272/12860
network_acronym_str RIAUTN
repository_id_str a
network_name_str Repositorio Institucional Abierto (UTN)
spelling Effect of fuels in combustion synthesis of CoCr2O4 pigmentsGardey Merino, MaríaCoCr2O4 pigments, Combustion synthesis, DRX, (TISS) paints.The CoCr2O4 is a bluish-green pigment characterized by a high thermal stability, good resistance to atmospheric effects and chemical corrosion [1]. This work is aimed to present the process of production of CoCr2O4 oxide by means of the original one-step stoichiometric combustion method starting from metallic nitrates and four fuels: aspartic acid (Asp) or lysine (Lys) or ethylenediaminetetraacetic acid (Edta) or tris(hydroxymethyl)aminomethane (Tris). In the production of CoCr2O4, once obtained the ashes by combustion processes, they are calcined for 2 hours at 800°C and 1000°C in air. The pigments are characterized by X-ray diffraction (XRD) to determine their crystalline structure, average crystallite size from peak (2 = 36°) using Scherrer equation. The diffraction data were analysed by the Rietveld method, using the FULLPROF refinement program. Additionally, L*a*b* colour parameters of samples were measured, following the CIEL*a*b* method [1]. In addition, the specific object of this paper is to analyse the influence of the crystalline structure on the pigment colour, then, these pigments will be applied to insensitive spectrally selective paints for coloured solar absorbers [2]. The diffractograms of all the pigments calcined at 1000°C (1000°Cpigment) correspond to CoCr2O4 which crystallizes in a cubic spinel structure with space group (No. 227) and a face-centred lattice defined in the cubic Fd- 3തm. In the case of Tris-1000°C pigment, the unit-cell parameter is: a= 8.224 Å. For this model, it was obtained a very good fit between observed graphics and the calculated XRD profiles producing good agreement factors as shown in Fig.1. The average crystallite size ranged between 30 and 50 nm for 1000°C-pigments. In the case of 800°C calcined pigments (800°C-pigments), the stabilized CoCr2O4 structure was also observed but with a lower crystallite size than 1000°C-pigments. Coordinate L* for 1000°C-pigments was lower than the one corresponding to 800°C-pigments. Additionally, coordinate b* is negative for 1000 °C- pigments, indicating a slight blue contribution, while for 800°C-pigments is positive indicating a slight yellow contribution. Probably, the increase of the calcination temperature would cause a higher crystallite size and more solar absorption. In conclusion 1000 °C- pigments are darker than 800°C-pigments and have a major aptitude to be used in spectrally selective paints. It would be necessary to carry out further specific technics to confirm this relation.Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza, ArgentinaUniversidad Tecnológica Nacional. Faculatd Regional Mendoza2025-05-06T13:21:58Z2021-11-17info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciapdfapplication/pdfXVI Reunión Anual de la Asociación Argentina de Cristalografíahttps://hdl.handle.net/20.500.12272/12860enginfo:eu-repo/semantics/openAccessCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/Universidad Tecnológica Nacional, Facultad Regional MendozaCC BY (Autoría) CC BY-NC (Autoría – No Comercial)reponame:Repositorio Institucional Abierto (UTN)instname:Universidad Tecnológica Nacional2026-10-01T11:56:41Zoai:ria.utn.edu.ar:20.500.12272/12860instacron: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:a2026-10-01 11:56:42.134Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacionalfalse
dc.title.none.fl_str_mv Effect of fuels in combustion synthesis of CoCr2O4 pigments
title Effect of fuels in combustion synthesis of CoCr2O4 pigments
spellingShingle Effect of fuels in combustion synthesis of CoCr2O4 pigments
Gardey Merino, María
CoCr2O4 pigments, Combustion synthesis, DRX, (TISS) paints.
title_short Effect of fuels in combustion synthesis of CoCr2O4 pigments
title_full Effect of fuels in combustion synthesis of CoCr2O4 pigments
title_fullStr Effect of fuels in combustion synthesis of CoCr2O4 pigments
title_full_unstemmed Effect of fuels in combustion synthesis of CoCr2O4 pigments
title_sort Effect of fuels in combustion synthesis of CoCr2O4 pigments
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 CoCr2O4 pigments, Combustion synthesis, DRX, (TISS) paints.
topic CoCr2O4 pigments, Combustion synthesis, DRX, (TISS) paints.
dc.description.none.fl_txt_mv The CoCr2O4 is a bluish-green pigment characterized by a high thermal stability, good resistance to atmospheric effects and chemical corrosion [1]. This work is aimed to present the process of production of CoCr2O4 oxide by means of the original one-step stoichiometric combustion method starting from metallic nitrates and four fuels: aspartic acid (Asp) or lysine (Lys) or ethylenediaminetetraacetic acid (Edta) or tris(hydroxymethyl)aminomethane (Tris). In the production of CoCr2O4, once obtained the ashes by combustion processes, they are calcined for 2 hours at 800°C and 1000°C in air. The pigments are characterized by X-ray diffraction (XRD) to determine their crystalline structure, average crystallite size from peak (2 = 36°) using Scherrer equation. The diffraction data were analysed by the Rietveld method, using the FULLPROF refinement program. Additionally, L*a*b* colour parameters of samples were measured, following the CIEL*a*b* method [1]. In addition, the specific object of this paper is to analyse the influence of the crystalline structure on the pigment colour, then, these pigments will be applied to insensitive spectrally selective paints for coloured solar absorbers [2]. The diffractograms of all the pigments calcined at 1000°C (1000°Cpigment) correspond to CoCr2O4 which crystallizes in a cubic spinel structure with space group (No. 227) and a face-centred lattice defined in the cubic Fd- 3തm. In the case of Tris-1000°C pigment, the unit-cell parameter is: a= 8.224 Å. For this model, it was obtained a very good fit between observed graphics and the calculated XRD profiles producing good agreement factors as shown in Fig.1. The average crystallite size ranged between 30 and 50 nm for 1000°C-pigments. In the case of 800°C calcined pigments (800°C-pigments), the stabilized CoCr2O4 structure was also observed but with a lower crystallite size than 1000°C-pigments. Coordinate L* for 1000°C-pigments was lower than the one corresponding to 800°C-pigments. Additionally, coordinate b* is negative for 1000 °C- pigments, indicating a slight blue contribution, while for 800°C-pigments is positive indicating a slight yellow contribution. Probably, the increase of the calcination temperature would cause a higher crystallite size and more solar absorption. In conclusion 1000 °C- pigments are darker than 800°C-pigments and have a major aptitude to be used in spectrally selective paints. It would be necessary to carry out further specific technics to confirm this relation.
Fil: Universidad Tecnológica Nacional. Facultad Regional Mendoza, Argentina
description The CoCr2O4 is a bluish-green pigment characterized by a high thermal stability, good resistance to atmospheric effects and chemical corrosion [1]. This work is aimed to present the process of production of CoCr2O4 oxide by means of the original one-step stoichiometric combustion method starting from metallic nitrates and four fuels: aspartic acid (Asp) or lysine (Lys) or ethylenediaminetetraacetic acid (Edta) or tris(hydroxymethyl)aminomethane (Tris). In the production of CoCr2O4, once obtained the ashes by combustion processes, they are calcined for 2 hours at 800°C and 1000°C in air. The pigments are characterized by X-ray diffraction (XRD) to determine their crystalline structure, average crystallite size from peak (2 = 36°) using Scherrer equation. The diffraction data were analysed by the Rietveld method, using the FULLPROF refinement program. Additionally, L*a*b* colour parameters of samples were measured, following the CIEL*a*b* method [1]. In addition, the specific object of this paper is to analyse the influence of the crystalline structure on the pigment colour, then, these pigments will be applied to insensitive spectrally selective paints for coloured solar absorbers [2]. The diffractograms of all the pigments calcined at 1000°C (1000°Cpigment) correspond to CoCr2O4 which crystallizes in a cubic spinel structure with space group (No. 227) and a face-centred lattice defined in the cubic Fd- 3തm. In the case of Tris-1000°C pigment, the unit-cell parameter is: a= 8.224 Å. For this model, it was obtained a very good fit between observed graphics and the calculated XRD profiles producing good agreement factors as shown in Fig.1. The average crystallite size ranged between 30 and 50 nm for 1000°C-pigments. In the case of 800°C calcined pigments (800°C-pigments), the stabilized CoCr2O4 structure was also observed but with a lower crystallite size than 1000°C-pigments. Coordinate L* for 1000°C-pigments was lower than the one corresponding to 800°C-pigments. Additionally, coordinate b* is negative for 1000 °C- pigments, indicating a slight blue contribution, while for 800°C-pigments is positive indicating a slight yellow contribution. Probably, the increase of the calcination temperature would cause a higher crystallite size and more solar absorption. In conclusion 1000 °C- pigments are darker than 800°C-pigments and have a major aptitude to be used in spectrally selective paints. It would be necessary to carry out further specific technics to confirm this relation.
publishDate 2021
dc.date.none.fl_str_mv 2021-11-17
2025-05-06T13:21:58Z
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
format conferenceObject
status_str publishedVersion
dc.identifier.none.fl_str_mv XVI Reunión Anual de la Asociación Argentina de Cristalografía
https://hdl.handle.net/20.500.12272/12860
identifier_str_mv XVI Reunión Anual de la Asociación Argentina de Cristalografía
url https://hdl.handle.net/20.500.12272/12860
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
Universidad Tecnológica Nacional, Facultad Regional Mendoza
CC BY (Autoría) CC BY-NC (Autoría – No Comercial)
eu_rights_str_mv openAccess
rights_invalid_str_mv CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
Universidad Tecnológica Nacional, Facultad Regional Mendoza
CC BY (Autoría) CC BY-NC (Autoría – No Comercial)
dc.format.none.fl_str_mv pdf
application/pdf
dc.publisher.none.fl_str_mv Universidad Tecnológica Nacional. Faculatd Regional Mendoza
publisher.none.fl_str_mv Universidad Tecnológica Nacional. Faculatd Regional Mendoza
dc.source.none.fl_str_mv 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
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