Rheological properties of concentrated aqueous fluorapatite suspensions

Autores
Albano, Maria Patricia; Garrido, Liliana Beatriz
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Ca3(PO4)2 and CaF2 powders were mixed in a 3:1.5 ratio, calcined at 1000 ºC and then milled in an aqueous media with the pH initially adjusted at 9. The resulting powder had a Ca/P atomic ratio of 1.67, which corresponded to the theoretical composition of fluorapatite (FA), Ca10(PO4)6F2. Its reactivity in an aqueous solution having two initial pH values with a concentration of ammonium polyacrylate (NH4PA) was  investigated as a function of time. The adsorption behaviour of NH4PA and the influence of NH4PA addition on the rheological properties of 40 vol.% FA slips were studied. In addition, the influence of the volume fraction of solids on the rheological behaviour of stabilized FA slips was determined. Finally, the effect of poly(vinyl)alcohol (PVA) addition on the relative viscosity of 38 vol.% FA suspensions stabilized with NH4PA was investigated. The dissolution of FA was enhanced by decreasing the pH to an acidic value; the increase in pH above 7 markedly reduced the Ca2+/H+ exchange reaction rate. As a result, well-stabilized aqueous suspensions could be obtained at pH close to 9 in a wide range of solids  loading. The minimum viscosity of 40 vol.% slips at pH 8.9 occurred at 0.6 wt% of NH4PA. An important increase in the yield stress was  observed for suspensions with a volume fraction of solids higher than about 46 vol.%. The addition of 0.5–1 wt% PVA to a well-stabilized FA slip caused aggregation of particles by a depletion flocculation mechanism, thereby increasing the slip viscosity.
Fil: Albano, Maria Patricia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina
Fil: Garrido, Liliana Beatriz. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina
Materia
Fluorapatite
Surface reactivity
rheological properties
Fluorapatite
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/279995
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Rheological properties of concentrated aqueous fluorapatite suspensionsAlbano, Maria PatriciaGarrido, Liliana BeatrizFluorapatiteSurface reactivityrheological propertiesFluorapatitehttps://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2The Ca3(PO4)2 and CaF2 powders were mixed in a 3:1.5 ratio, calcined at 1000 ºC and then milled in an aqueous media with the pH initially adjusted at 9. The resulting powder had a Ca/P atomic ratio of 1.67, which corresponded to the theoretical composition of fluorapatite (FA), Ca10(PO4)6F2. Its reactivity in an aqueous solution having two initial pH values with a concentration of ammonium polyacrylate (NH4PA) was  investigated as a function of time. The adsorption behaviour of NH4PA and the influence of NH4PA addition on the rheological properties of 40 vol.% FA slips were studied. In addition, the influence of the volume fraction of solids on the rheological behaviour of stabilized FA slips was determined. Finally, the effect of poly(vinyl)alcohol (PVA) addition on the relative viscosity of 38 vol.% FA suspensions stabilized with NH4PA was investigated. The dissolution of FA was enhanced by decreasing the pH to an acidic value; the increase in pH above 7 markedly reduced the Ca2+/H+ exchange reaction rate. As a result, well-stabilized aqueous suspensions could be obtained at pH close to 9 in a wide range of solids  loading. The minimum viscosity of 40 vol.% slips at pH 8.9 occurred at 0.6 wt% of NH4PA. An important increase in the yield stress was  observed for suspensions with a volume fraction of solids higher than about 46 vol.%. The addition of 0.5–1 wt% PVA to a well-stabilized FA slip caused aggregation of particles by a depletion flocculation mechanism, thereby increasing the slip viscosity.Fil: Albano, Maria Patricia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; ArgentinaFil: Garrido, Liliana Beatriz. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; ArgentinaElsevier2010-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/279995Albano, Maria Patricia; Garrido, Liliana Beatriz; Rheological properties of concentrated aqueous fluorapatite suspensions; Elsevier; Ceramics International; 36; 6; 8-2010; 1779-17860272-8842CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0272884210001355info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ceramint.2010.03.012info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-02-26T10:25:11Zoai:ri.conicet.gov.ar:11336/279995instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-02-26 10:25:12.073CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Rheological properties of concentrated aqueous fluorapatite suspensions
title Rheological properties of concentrated aqueous fluorapatite suspensions
spellingShingle Rheological properties of concentrated aqueous fluorapatite suspensions
Albano, Maria Patricia
Fluorapatite
Surface reactivity
rheological properties
Fluorapatite
title_short Rheological properties of concentrated aqueous fluorapatite suspensions
title_full Rheological properties of concentrated aqueous fluorapatite suspensions
title_fullStr Rheological properties of concentrated aqueous fluorapatite suspensions
title_full_unstemmed Rheological properties of concentrated aqueous fluorapatite suspensions
title_sort Rheological properties of concentrated aqueous fluorapatite suspensions
dc.creator.none.fl_str_mv Albano, Maria Patricia
Garrido, Liliana Beatriz
author Albano, Maria Patricia
author_facet Albano, Maria Patricia
Garrido, Liliana Beatriz
author_role author
author2 Garrido, Liliana Beatriz
author2_role author
dc.subject.none.fl_str_mv Fluorapatite
Surface reactivity
rheological properties
Fluorapatite
topic Fluorapatite
Surface reactivity
rheological properties
Fluorapatite
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The Ca3(PO4)2 and CaF2 powders were mixed in a 3:1.5 ratio, calcined at 1000 ºC and then milled in an aqueous media with the pH initially adjusted at 9. The resulting powder had a Ca/P atomic ratio of 1.67, which corresponded to the theoretical composition of fluorapatite (FA), Ca10(PO4)6F2. Its reactivity in an aqueous solution having two initial pH values with a concentration of ammonium polyacrylate (NH4PA) was  investigated as a function of time. The adsorption behaviour of NH4PA and the influence of NH4PA addition on the rheological properties of 40 vol.% FA slips were studied. In addition, the influence of the volume fraction of solids on the rheological behaviour of stabilized FA slips was determined. Finally, the effect of poly(vinyl)alcohol (PVA) addition on the relative viscosity of 38 vol.% FA suspensions stabilized with NH4PA was investigated. The dissolution of FA was enhanced by decreasing the pH to an acidic value; the increase in pH above 7 markedly reduced the Ca2+/H+ exchange reaction rate. As a result, well-stabilized aqueous suspensions could be obtained at pH close to 9 in a wide range of solids  loading. The minimum viscosity of 40 vol.% slips at pH 8.9 occurred at 0.6 wt% of NH4PA. An important increase in the yield stress was  observed for suspensions with a volume fraction of solids higher than about 46 vol.%. The addition of 0.5–1 wt% PVA to a well-stabilized FA slip caused aggregation of particles by a depletion flocculation mechanism, thereby increasing the slip viscosity.
Fil: Albano, Maria Patricia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina
Fil: Garrido, Liliana Beatriz. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina
description The Ca3(PO4)2 and CaF2 powders were mixed in a 3:1.5 ratio, calcined at 1000 ºC and then milled in an aqueous media with the pH initially adjusted at 9. The resulting powder had a Ca/P atomic ratio of 1.67, which corresponded to the theoretical composition of fluorapatite (FA), Ca10(PO4)6F2. Its reactivity in an aqueous solution having two initial pH values with a concentration of ammonium polyacrylate (NH4PA) was  investigated as a function of time. The adsorption behaviour of NH4PA and the influence of NH4PA addition on the rheological properties of 40 vol.% FA slips were studied. In addition, the influence of the volume fraction of solids on the rheological behaviour of stabilized FA slips was determined. Finally, the effect of poly(vinyl)alcohol (PVA) addition on the relative viscosity of 38 vol.% FA suspensions stabilized with NH4PA was investigated. The dissolution of FA was enhanced by decreasing the pH to an acidic value; the increase in pH above 7 markedly reduced the Ca2+/H+ exchange reaction rate. As a result, well-stabilized aqueous suspensions could be obtained at pH close to 9 in a wide range of solids  loading. The minimum viscosity of 40 vol.% slips at pH 8.9 occurred at 0.6 wt% of NH4PA. An important increase in the yield stress was  observed for suspensions with a volume fraction of solids higher than about 46 vol.%. The addition of 0.5–1 wt% PVA to a well-stabilized FA slip caused aggregation of particles by a depletion flocculation mechanism, thereby increasing the slip viscosity.
publishDate 2010
dc.date.none.fl_str_mv 2010-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/279995
Albano, Maria Patricia; Garrido, Liliana Beatriz; Rheological properties of concentrated aqueous fluorapatite suspensions; Elsevier; Ceramics International; 36; 6; 8-2010; 1779-1786
0272-8842
CONICET Digital
CONICET
url http://hdl.handle.net/11336/279995
identifier_str_mv Albano, Maria Patricia; Garrido, Liliana Beatriz; Rheological properties of concentrated aqueous fluorapatite suspensions; Elsevier; Ceramics International; 36; 6; 8-2010; 1779-1786
0272-8842
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0272884210001355
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ceramint.2010.03.012
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.176822

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