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中文摘要：
以正硅酸乙酯（TEOS）为有机硅源,配制不同密度的溶胶,经逐层凝胶工艺结合CO2超临界干燥技术,获得50～200mg/cm3的密度渐变SiO2气凝胶。采用扫描电子显微镜（SEM）、X射线相衬成像等手段对制备获得的SiO2气凝胶进行了测试表征。重点研究了不同密度层间界面的情况,发现相邻两层SiO2气凝胶颗粒堆积的紧密程度不同,在界面处存在一定的互扩散。进一步对连续密度梯度SiO2气凝胶的制备提出了展望。
英文摘要：
Graded density silica aerogel was derived from a layer-by-layer gelation technic with tetraethoxysilane（TEOS）as the organic precursor and supercritical drying process,whose density ranges from 50-200mg/cm3.SEM,X-ray phase contrast method were used to characterize the graded density silica aerogel prepared,especially its layer interface structure.It can be found that the practical packing tightness was different between adjacent layer and there exist interdiffusion in the interface.Moreover,the gradient density aerogel was expected to be fabricated in this paper.
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Synthesis and electrochemical performance of lithium vanadium oxide nanotubes as cathodes for rechar
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