摘要
以正硅酸乙酯（TEOS），硝酸镍为原料，HF为催化剂，通过sol-gel法，经CO2超临界流体干燥，可快速制备含镍的SiO2气凝胶；HF的加入大大加速了溶胶-凝胶反应速度。气凝胶密度在20～200mg／cm^3范围内连续可调，镍含量的浓度可在1％～30％范围内控。运用IR、XRF、XRD、TEM等方法对样品进行结构表征。研究结果表明，掺杂物以非晶态形式成功掺人SiO2气凝胶中，经673K热处理5h，后SiO2气凝胶载体的微结构未被破坏。
The nickel-contalning silica aerogels were prepared by sol-gel-SCFD using tetraethylorthosilicate （TEOS） as a precursor of silica and nickel nitrate as starting material of nickel. As a catalyst, HF can accelerate gel process and prepare nickel-containing silica aerogels rapidly. The density of nickel-containing silica aerogels can be varied continuously in the range of 20-200rag/cm^3 ,and the nickel content can be controlled from 1 percent to 30 percent. The physical properties and the structure of the nickel-containing silica aerogels were characterized by TEM, XRD,XRF and IR etc. The results show that non-crystal nickel nitrate was successfully incorporated into the silica aerogels without any destruction after calcining 5h at 673K.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2008年第6期1020-1023,共4页
Journal of Functional Materials
基金
国家高技术研究发展计划(863计划)资助项目(2007AA804137)
教育部国防基础科研培育资助项目(A1420060199)
上海科技启明星计划资助项目(05QMX1454)
上海市科委纳米技术专项资助项目(0652nm044)
上海市科委科技攻关计划资助项目(055211010)
关键词
含镍SiO2气凝胶
掺杂
热处理
nickel-containing silica aerogels
doped
calcining
