Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite

Halloysite and its heating products demand attention due to its multiple technological applications, and in particular for its natural nanostructure. The purpose of this paper is to present a structural characterization of these materials and its firing products up to mullite. To achieve this object...

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Detalles Bibliográficos
Autores principales:	Andrini, Leandro Rubén, Moreira Toja, Ramiro Julián, Conconi, María Susana, Requejo, Félix Gregorio, Rendtorff Birrer, Nicolás Maximiliano
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2019
Materias:	Ciencias Exactas halloysite thermal behavior structure XANES
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125120
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-125120
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Exactas halloysite thermal behavior structure XANES
spellingShingle	Ciencias Exactas halloysite thermal behavior structure XANES Andrini, Leandro Rubén Moreira Toja, Ramiro Julián Conconi, María Susana Requejo, Félix Gregorio Rendtorff Birrer, Nicolás Maximiliano Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite
topic_facet	Ciencias Exactas halloysite thermal behavior structure XANES
description	Halloysite and its heating products demand attention due to its multiple technological applications, and in particular for its natural nanostructure. The purpose of this paper is to present a structural characterization of these materials and its firing products up to mullite. To achieve this objective, the techniques of conventional X-ray diffraction (XRD) and X-ray absorption near-edge structure (XANES) were used, in addition to scanning electron microscopy (SEM), and simultaneous thermogravimetric and differential thermal analysis (DTA-TG). SEM has allowed to prove that the nanotubular morphology (acicular) of halloysite was retained for all temperatures (500, 800, 1100 and 1250 °C). For the temperatures between 500 and 800 °C the metahalloysite phase was identified. The 1100 °C fired samples presented the spinel aluminosilicate phase. Finally, after high temperature treatments the mullite phase was detected as the only aluminum containing crystalline phase accompanied by cristobalite and glassy phase. The XANES spectra confirmed the octahedral aluminum coordination in native halloysite, this coordination was progressively lost with the thermal treatments giving place to the presence of the four folded coordination. In the intermediate treatments, the so called metahalloysite phase, presented some three and five coordination slight contributions. Particularly, the metahalloysite Al K XANES spectra were not reported before.
format	Articulo Preprint
author	Andrini, Leandro Rubén Moreira Toja, Ramiro Julián Conconi, María Susana Requejo, Félix Gregorio Rendtorff Birrer, Nicolás Maximiliano
author_facet	Andrini, Leandro Rubén Moreira Toja, Ramiro Julián Conconi, María Susana Requejo, Félix Gregorio Rendtorff Birrer, Nicolás Maximiliano
author_sort	Andrini, Leandro Rubén
title	Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite
title_short	Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite
title_full	Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite
title_fullStr	Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite
title_full_unstemmed	Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite
title_sort	halloysite nanotube and its firing products: structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite
publishDate	2019
url	http://sedici.unlp.edu.ar/handle/10915/125120
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Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite

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