Formation process of kaolinite from the amorphous mixture of silica and alumina
Ritsuro Miyawaki,Shinji Tomura,Keiichi Inukai,Yasuo Shibasaki,Masaharu Okazaki,Soichiro Samejima,Shigeo Satokawa +6 more
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In this paper, the formation process of kaolinite from the amorphous mixture of silica and alumina by hydrothermal reaction was studied by XRD, IR, DTA-TG, TEM, and high-resolution solid state 29 Si- and 27 Al-MAS/NMR.Abstract:
The formation process of kaolinite from the amorphous mixture of silica and alumina by hydrothermal reaction was studied by XRD, IR, DTA-TG, TEM, and high-resolution solid state 29 Si- and 27 Al-MAS/NMR. The amorphous mixture of the starting material prepared with commercially available silica-sol and alumina-sol was hydrothermally treated with distilled water in a Teflon pressure vessel at 220°C for a reaction time varying from 1 to 144 hours. The Q 4 state component of the amorphous starting material changed into an intermediate amorphous Q 3 state. The intermediate amorphous phase converted into crystalline kaolinite with spherical shape (Q 3 state). The yield and crystallinity of kaolinite increased with an increase in the reaction timeread more
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References
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Structural studies of silicates by solid-state high-resolution silicon-29 NMR
Journal Article
High-resolution silicon-29 nuclear magnetic resonance spectroscopic study of rock-forming silicates
TL;DR: In this article, high-resolution silicon-29 magic-angle sample-spinning NMR spectroscopic studies of a wide range of natural and synthetic silicates indicate considerable overlap among the ranges of isotropic chemical shifts for crystals of different polymer types.
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High resolution aluminum-27 and silicon-29 nuclear magnetic resonance spectroscopic study of layer silicates, including clay minerals
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Detection of two silicon environments in kaolins by solid-state 29 Si NMR
TL;DR: In this article, an investigation of kaolins using solid-state 29Si NMR and X-ray crystallography is carried out to study relationships between measured NMR parameters and Xray determined properties.
Journal ArticleDOI
Growth Conditions and Genesis of Spherical and Platy Kaolinite
TL;DR: The results indicated that the growth of the spherical kaolinite was favored at high degrees of supersaturation, whereas the growth was relatively low at relatively low degrees of superaturation as discussed by the authors.