Phyllosilicates synthesis: a way of accessing edges contributions in NMR and FTIR spectroscopies. Example of synthetic talc |
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Authors: | Angela Dumas François Martin Christophe Le Roux Pierre Micoud Sabine Petit Eric Ferrage Jocelyne Brendlé Olivier Grauby Mike Greenhill-Hooper |
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Institution: | 1. ERT 1074 ?Géomatériaux?, GET UMR 5563 (Géosciences Environnement Toulouse), Univ. Toulouse, UPS-CNRS-IRD-CNES, 14 Avenue Edouard Belin, 31400, Toulouse, France 2. Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers, CNRS UMR 7285, HydrASA rue Michel Brunet, 86022, Poitiers, France 3. Equipe Matériaux à Porosité Contr?lée, Institut de Science des Matériaux de Mulhouse (LRC CNRS 7228), Ecole Nationale Supérieure de Chimie de Mulhouse, Université de Haute Alsace, 3 rue Alfred Werner, 68093, Mulhouse, France 4. CINaM-CNRS & Aix Marseille University, Campus de Luminy, Case 913, 13288, Marseille Cedex 9, France 5. Imerys Talc Europe, 2 place édouard Bouillères, BP 33662, 31036, Toulouse Cedex 1, France
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Abstract: | A series of new-generation synthetic talcs were prepared by varying the hydrothermal synthesis duration from a few hours up to 2 months. Crystallinity and particle size analysis of the synthetic products were evaluated by photon correlation spectroscopy, transmission electron microscopy, differential thermal analysis and unoriented X-ray diffraction, and then analyzed by various spectroscopic methods such as Fourier transformed infrared spectroscopy and solid-state 1H and 29Si magic angle spinning nuclear magnetic resonance. The new process for preparing synthetic talcs allows to obtain single-phased particles which after few hours grow heterogeneously and simultaneously in both the c* direction and the (ab) plan. Fine particles, observed for whatever the synthesis duration, lead to the presence of numerous sheet edges surfaces due to particle size which represents the main difference with natural talc. Spectroscopy data show the influence of the fine particles on signals and highlight that synthetic talc characterization is a potential tool for better understanding crystal chemistry of natural talc. |
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