DÍEZ GARCÍA, Marta; GAITERO, Juan J.; I., Jose I.; DOLADO, Jorge S.; AYMONIER, Cyril

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DÍEZ GARCÍA, Marta
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Tecnalia [Derio]
Universidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne] [UPV / EHU]

GAITERO, Juan J.
Tecnalia [Derio]

I., Jose I.
Universidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne] [UPV / EHU]

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Article de revue

Ce document a été publié dans

Journal of flow chemistry. 2018, vol. 8, n° 2, p. 89–95

Akademiai Kiado

Résumé en anglais

This article reports a satisfactory and innovative method for the synthesis of xonotlite using a flow reactor and supercritical water. This study widens the variety of inorganic nanofibers produced in record breaking times by means of continuous reactors working under supercritical water conditions. In particular, the synthesis time of xonotlite, which takes normally more than 5 h, was reduced to only 20s by carrying out the reaction at 400 °C and 23.5 MPa. Resulting product was studied by several characterization techniques: x-ray diffraction, transmission electron microscopy, 29Si and 1H nuclear magnetic resonance and infrared spectroscopy. Furthermore, obtained product consisted of highly pure and crystalline flat nanofibers of 1–10 μm long with a length to diameter ratio of the order of 100. Also, the typical deviation from the ideal structure observed by nuclear magnetic resonance and the presence of Si-OH were explained in terms of surface defects. This work reinforces the interests of using supercritical conditions for the fast synthesis of crystalline nano-calcium silicates which, due to the number of potential industrial applications and the scalability of the technology, might represent technological breakthrough.< Réduire

Mots clés en anglais

Supercritical water

Xonotlite

Ultra-fast synthesis

Flow synthesis

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026