Ultra-Fast Supercritical Hydrothermal Synthesis of Tobermorite under Thermodynamically Metastable Conditions
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2017-03-13
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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. 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.
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Publisher Copyright: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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continuous reactor , metastable phases , supercritical water , tobermorite , ultra-fast synthesis , Catalysis , General Chemistry , Funding Info , This study was carried out under the umbrella of the BASKRETE initiative and supported by the Basque Government under the ETORTEK Program (project nanoGUNE 2014) and the ELKARTEK Program (project SUPER). In addition, Marta Diez is grateful to the University of the Basque Country (UPV/EHU) and the University of Bordeaux for her pre-doctoral fellowship, within the framework of the Cross-Border Euroregional Campus of International Excellence IDEX Bordeaux - Euskampus. , This study was carried out under the umbrella of the BASKRETE initiative and supported by the Basque Government under the ETORTEK Program (project nanoGUNE 2014) and the ELKARTEK Program (project SUPER). In addition, Marta Diez is grateful to the University of the Basque Country (UPV/EHU) and the University of Bordeaux for her pre-doctoral fellowship, within the framework of the Cross-Border Euroregional Campus of International Excellence IDEX Bordeaux - Euskampus.
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Diez-Garcia , M , Gaitero , J J , Dolado , J S & Aymonier , C 2017 , ' Ultra-Fast Supercritical Hydrothermal Synthesis of Tobermorite under Thermodynamically Metastable Conditions ' , Angewandte Chemie - International Edition , vol. 56 , no. 12 , pp. 3162-3167 . https://doi.org/10.1002/anie.201611858 , https://doi.org/10.1002/ange.201611858