Paper number 1000


Chen Yimin, Xie Kai , Pan Yi , Xu Jin, Zao Xun

Department of Materials Engineering and Applied Chemistry, National
University of Defense Technology, Changsha 410073, P.R.China

Summary Metal-containing etraethyl orthosilicate (M-TEOS) serve as the sol-gel precursors to prepare the Metal/SiO2 nanocomposite aerogels of high metal content. The good dispersion and interfacial peoperties of nanophase metal particles on silica aerogels are formed by the sol-gel processing of M-TEOS, oxidation and reduce process at high temperature. The oxidating and reducing temperature have a heavy effect on the specific surface area of nanocomposite aerogel. BET result shows that metal (Fe, Co or Ni)/SiO2 nanocomposite aerogels have high specific surface area (400~700m2/g). The particles size of the Metal/SiO2 nanocomposite aerogel are mostly in the range of 5~25nm by (SAXS).
Keywords sol-gel processing, nanocomposite aerogel, supercritical drying, Ni-containing TEOS, TEOS.

Theme : Ceramic Matrix and C/C Composites ; Processing and Forming

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