書誌事項
- タイトル別名
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- Synthesis and Characteristics of Al<sup>3+</sup>-Substituted Tobermorite by Alkoxide Method
- アルコキシドホウ ニ ヨル Al3 + チカンガタ トバモライト ノ ゴウセイ
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The preparation of glasses, fibres and ultra-fine powders for fine-ceramic materials by the alkoxide method has recently attracted special interest. Tobermorite is generally synthesized by hydrothermal reaction under saturated steam pressure of 10kgf/cm2 above 180°C in unhomogeneous suspension of CaO(solid)-SiO2(solid)-H2O (liquid) system. A study was made to investigate the synthesis of Al3+-substituted tobermorite at a low temperature (95°C) under atmospheric pressure by using homogeneous mixed solutions of the CaCl2-Si(OC2H5)4-AlCl3-C2H5OH-H2O system. The thermal behavior and cation exchange for the Al3+-substituted tobermorite were carried out by means of X-ray diffraction, thermal analysis (TG-DTA), infrared spectroscopy and chemical analysis. The procedure for the synthesis of Al3+-substituted tobermorite consisted of deposition of a CSH gel from homogeneous mixed solutions (Ca/Si atomic ratio: 1.0, Al/(Al+Si) atomic ratio: 0.03-0.20) by adding KOH solution and the crystallization of the gel by aging at 95°C under atmospheric pressure for 5 days. A basal spacing due to (002) plane in tobermorite was affected by the Al/(Al+Si) atomic ratio; 10.7Å below the atomic ratio of 0.03 and 11.3Å in the atomic ratio of 0.05-0.20. The crystallization of Al3+-substituted tobermorite was much accelerated in the range of the Al/(Al+Si) atomic ratio of 0.05-0.10 but converted to the CSH gel over the atomic ratio of 0.20. A basal spacing expanded with increasing Al3+ substituted for Si4+ in silicate ion chains of tobermorite dependent on the substitution of greater Al3+ than Si4+ in size and the limitation for this substitution were approximately 18% as Al3+. Consequently, Al3+-substituted tobermorite included much K+ which was supplied to neutralize the electric charge happened by the substitution. The capacity of cation exchange for K+→←Na+ of Al3+-substituted tobermorite increased with increasing amount of substituted Al3+. The maximum capacity was 80-90meq/100g. Even in the case of the CSH gel, the capacity indicated the same values but in the exchange capacity per unit-surface, the former showed higher value than the latter.
収録刊行物
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- Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
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Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 99 (1153), 780-787, 1991
公益社団法人 日本セラミックス協会
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詳細情報 詳細情報について
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- CRID
- 1390001205276626688
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- NII論文ID
- 110002291056
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- NII書誌ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL書誌ID
- 3731740
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- データソース種別
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- JaLC
- NDL
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- 使用不可