アロフェン, イモゴライトの合成 : 希薄溶液中でのケイ酸とアルミニウムイオンの反応(粘土の合成)

概要

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Studies on synthesis of allophane and imogolite are briefly reviewed. Imogolite is synthesized by heating partially neutralized and slightly re-acidified solutions containing monomeric silicic acid and aluminum salts. The optimum Si/Al molar ratio is slightly greater than 0.5. Allophane is synthesized by heating neutralized solutions which have Si/AI molar ratio of 0.5 to 4. In the light of recent studies on the reactions between monomeric silicic acid and aluminumions, imogolite is considered to from by the growth of ionic "proto-imogolite". Allophane is considered to form by reorganization of the structure of precipitated noncrystalline aluminum silicates. The structure and properties of synthetic allophane and imogolite are considered to be essentially the same as those of natural counterparts except that the diameter of the tubular structural unit of the synthetic imogolite is greater than that of natural imogolite.
日本粘土学会の論文
1985-07-30