Aquacreptite の合成

概要

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Aquacreptite was prepared from the reaction of colloidal silica and magnesium hydroxide in aqueous ammonia solution under hydrothermal condition. The X-ray diffraction pattern of prepared sample agreed with that of natural aquacreptite (Fig. 1 and Table 2). The reaction temperature was an important factor the formation of aquacreptite. In this experiment, the product was obtained above 280℃. The intensity of the 9.8Å reflection increased with the increase of calcined temperature of the sample. The thermal analysis (Fig. 2) showed an endothermic reaction with weight loss at about 75℃, which is due to the the dehydration of the zeolitic and the absorbed water. The bounded water molecules were lost gradully in the temperature range from about 100℃ to 830℃. A continuous exo-, endo- and exothermic curve with weight loss was obtained about 830℃. This was due to the loss of hydroxyl water and recystalization. An electron micrograph is shown in Fig. 3.
日本粘土学会の論文
1983-08-25