气凝胶
超临界二氧化碳
超临界流体
材料科学
化学工程
水溶液
异丙醇
硼
再结晶(地质)
铍
超临界流体萃取
超临界干燥
化学
有机化学
复合材料
古生物学
工程类
生物
作者
Zeshan Hu,L.G Wang,Zhongwen Ou,Li Xin Huang,Ruiyun Lai,Tianbiao He,Junhang Dong,G.X Chen
标识
DOI:10.1016/s0032-5910(00)00317-x
摘要
A supercritical carbon dioxide drying technique was developed to prepare nanometer particulate materials. The technique consists of preparation of an aqueous gel, filtering, washing, replacement of the water in the gel with a mixture solvent of n-butanol and ligroin and supercritical carbon dioxide drying. The product was characterized with TEM, XRD and X-ray small-angle scattering. The results indicated that an amorphous aerogel of the beryllium borate was obtained with this technique. The diameter of the product particles was about 7 nm. Isopropyl alcohol supercritical drying was also used to prepare aerogel beryllium borate, where recrystallization took place due to the high critical temperature of isopropanol.
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