Ultra-Fast Supercritical Hydrothermal Synthesis of Tobermorite under Thermodynamically Metastable Conditions.
DIEZ-GARCIA, Marta
Tecnalia [Derio]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Department of Mining-Metallurgy Engeneering and Materials Science
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Tecnalia [Derio]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Department of Mining-Metallurgy Engeneering and Materials Science
DIEZ-GARCIA, Marta
Tecnalia [Derio]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Department of Mining-Metallurgy Engeneering and Materials Science
< Reduce
Tecnalia [Derio]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Department of Mining-Metallurgy Engeneering and Materials Science
Language
en
Article de revue
This item was published in
Angewandte Chemie International Edition. 2017-02-03, vol. 56, n° 12, p. 3162-3167
Wiley-VCH Verlag
English Abstract
Tobermorite is a fibrillar mineral of the family of calcium silicates. In spite of not being abundant in nature, its structure and properties are reasonably well known because of its interest in the construction industry. ...Read more >
Tobermorite is a fibrillar mineral of the family of calcium silicates. In spite of not being abundant in nature, its structure and properties are reasonably well known because of its interest in the construction industry. Currently, tobermorite is synthesized by hydrothermal methods at mild temperatures. The problem is that such processes are very slow (>5 h) and temperature cannot be increased to speed them up because tobermorite is metastable over 130 °C. Furthermore the product obtained is generally foil-like and not very crystalline. Herein we propose an alternative synthesis method based on the use of a continuous flow reactor and supercritical water. In spite of the high temperature, the transformation of tobermorite to more stable phases can be prevented by accurately controlling the reaction time. As a result, highly crystalline fibrillar tobermorite can be obtained in just a few seconds under thermodynamically metastable conditions.Read less <
English Keywords
continuous reactor
metastable phases
supercritical water
tobermorite
ultra-fast synthesis
Origin
Hal imported