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Investigation of high-pressure and temperature behavior of surfactant-containing periodic mesostructured silicas

机译:含表面活性剂的周期性介孔结构二氧化硅的高温高压行为研究

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摘要

Surfactant-containing periodic mesostructured silica materials, namely SBA-16 and FDU-12, were studied under pressures between 1 and 4 GPa and temperatures between 100 and 400 C. At 4 GPa crystallization of coesite can be achieved already at 200 C. The mild transition of amorphous to crystalline silica is believed to be accomplished by the inbuilt hydroxyl groups present in the starting material. At 2 GPa the crystallization of quartz is accomplished at a temperature of 400 C. Both quartz and coesite are obtained in nanocrystalline form.
机译:在1至4 GPa的压力和100至400 C的温度下研究了含表面活性剂的周期性介孔结构二氧化硅材料,即SBA-16和FDU-12。在4 GPa时,在200 C时已经可以实现堇青石的结晶。据信由原料中存在的内建羟基完成无定形向结晶二氧化硅的转变。在2 GPa下,石英的结晶在400°C的温度下完成。石英和堇青石均以纳米晶形式获得。

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