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Flow supercritical synthesis of brucite and magnesian T-O, T-O-T phyllosilicates: an opportunity to tune the structure with the solvent composition

Published online by Cambridge University Press:  04 September 2018

Marie Claverie ,
François Martin ,
Christel Careme ,
Christophe Le Roux ,
Pierre Micoud ,
Olivier Grauby  and
Cyril Aymonier
Marie Claverie
Affiliation:
Imerys, 2 Place Édouard Bouillères, Toulouse, 31100, France
François Martin*
Affiliation:
Géosciences Environnement Toulouse (GET, UMR 5563, UPS-CNRS-IRD-CNES, ERT 1074 Géomatériaux), 14 Avenue Édouard Belin, Toulouse, 31400, France
Christel Careme
Affiliation:
Imerys, 2 Place Édouard Bouillères, Toulouse, 31100, France
Christophe Le Roux
Affiliation:
Géosciences Environnement Toulouse (GET, UMR 5563, UPS-CNRS-IRD-CNES, ERT 1074 Géomatériaux), 14 Avenue Édouard Belin, Toulouse, 31400, France
Pierre Micoud
Affiliation:
Géosciences Environnement Toulouse (GET, UMR 5563, UPS-CNRS-IRD-CNES, ERT 1074 Géomatériaux), 14 Avenue Édouard Belin, Toulouse, 31400, France
Olivier Grauby
Affiliation:
Aix Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Marseille, 13288, France
Cyril Aymonier*
Affiliation:
CNRS, Univ. Bordeaux, ICMCB, UPR 9048, Pessac, 33600, France
*
*E-mail: francois.martin@get.omp.eu; cyril.aymonier@icmcb.cnrs.fr
*E-mail: francois.martin@get.omp.eu; cyril.aymonier@icmcb.cnrs.fr
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Abstract

This work presents the synthesis of minerals with a layered structure in supercritical water/ethanol mixtures to decrease the critical coordinates of the solvent regarding water. Depending on the water/ethanol ratio of the solvent, we obtained three different minerals adopting an octahedral brucitic sheet: (1) without a Si-tetrahedral sheet (O); (2) associated with one Si-tetrahedral sheet (T-O); or (3) intercalated between two Si-tetrahedral sheets (T-O-T). We have thus shown that ethanol in a supercritical water/ethanol mixture changes the solubility of silicon with a direct consequence on the formation of the tetrahedral silicon sheets and thus makes it possible to control the structure of the synthesized layered material.

Keywords

phyllosilicatesbrucitecontinuous-flow synthesissupercritical water/ethanol mixtures
Type
Article
Information
Clay Minerals , Volume 53 , Issue 3 , September 2018 , pp. 497 - 503
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

This paper was originally presented during the session: ‘NT-10 Recent advances in applications of industrial clays’ of the International Clay Conference 2017.

Editor: G. E. Christidis

References

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