With tetramethoxysilane as the silica precursor, CuCl2·2H2O as the copper–oxide precursor, acetonitrile as the solvent and gelled by PO via a sol–gel process, the CuO/SiO2 composite aerogel was fabricated. By adjusting the amount of CuCl2·2H2O, CuO/SiO2 composite aerogels with different molar ratio of Cu/Si such as 1, 5, 10, 20, 30 and 35 % was prepared. Finally, via a self-built device and sol-co-gelation technic, a continuous formation process was developed to fabricate the composition-gradient CuO/SiO2 composite aerogel. Density of these aerogels was about 200 mg/cm3, the composition-gradient CuO/SiO2 composite aerogel was cylindrical and about 2.5 cm in height. Scanning electron microscope was used to characterize its microstructure at different position. X-ray diffraction, energy dispersive spectrometer and Fourier transform infrared spectrometer were used to characterize its composition and composition distribution, the results showed that the cylindrical CuO/SiO2 composite aerogel’s molar ratio of Cu/Si changed from 31.06 to 4.43 % as the measure point from the bottom up, the whole sample displayed obvious composition-gradient.
This is a preview of subscription content, log in to check access
This work was supported by National Natural Science Foundation of China (51102184, 51172163), Shanghai Committee of Science and Technology (12nm0503001), National Science and Technology Support Program (SQ2011BAJY3505), National High Technology Research and Development Program of China (2013AA031801).
Clapsaddle BJ, Sprehn DW (2004) A versatile sol–gel synthesis route to metal–silicon mixed oxide nanocomposites that contain metal oxides as the major phase. J Non-Cryst Solids 350:173–181CrossRefGoogle Scholar
Xu W, Du A (2012) Rapid preparation of highly doped CuO/SiO2 composite aerogels. Acta Phys-Chim Sin 28:2958–2964Google Scholar
Du A, Zhou B (2009) Monolithic copper oxide aerogel via dispersed inorganic sol–gel method. J Non-Cryst Solids 355:175–181CrossRefGoogle Scholar
Gash AE, Tillotson TM (2001) New sol-gel synthetic route to transition and main-group metal oxide aerogels using inorganic salt precursors. J Non-Cryst Solids 285:22–28CrossRefGoogle Scholar
Sisk CN, Hope-Weeks LJ (2008) Copper (II) aerogels via 1, 2-epoxide gelation. J Mater Chem 18:2607–2610CrossRefGoogle Scholar
Gash AE, Satcher JH Jr (2004) Monolithic nickel (II)-based aerogels using an organic epoxide: the importance of the counterion. J Non-Cryst Solids 350:145–151CrossRefGoogle Scholar
Owens L, Tillotson TM (1995) Characterization of vanadium/silica and copper/silica aerogel catalysts. J Non-Cryst Solids 186:177–183CrossRefGoogle Scholar
Fabrizioli P, Burgi T (2002) Synthesis, structural and chemical properties of iron oxide–silica aerogels. J Mater Chem 12:619–630CrossRefGoogle Scholar
Clapsaddle BJ, Gash AE (2003) Silicon oxide in an iron (III) oxide matrix: the sol–gel synthesis and characterization of Fe–Si mixed oxide nanocomposites that contain iron oxide as the major phase. J Non-Cryst Solids 331:190–201CrossRefGoogle Scholar