Synthesis of coesite nanocrystals from ethane bridged periodic mesoporous organosilica at low temperature and extreme pressure

[摘要]：Coesite nanocrystals have been synthesized from periodic mesoporous organosilica (PMO) with (CH2)(2) bridges heated at 300 degrees C for 150 min and 12 GPa. The crystals are not sintered, single crystalline, and have diameters of ca. 100-300 nm. Below 300 degrees C, an amorphous non-porous organosilica glass was obtained. Heating above 300 degrees C at 12 GPa results in the rapid crystal growth and micron size coesite crystals were formed.

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