ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Low density SiO2-xZrO2 aerogels with x=35wt%, 65wt%, 75wt%, 90wt%, 95wt% wereprepared by CO2 supercritical drying technique with tetraethylorthosilicate (TEOS) and zirconyl nitratedihydrate (ZrO(NO3)2.2H2O) by hydrolytic polycondensation under different chemical conditions. Theprepared aerogels are performed by X-ray Diffraction (XRD), Transmission electron microscopy (TEM),Fourier transformed infrared spectroscopy (FT-IR) and BET surface areas to characterize and analyze themorphology and pore structure of SiO2-ZrO2 aerogels. The results showed that the SiO2-ZrO2 areogels arethe typical of nano mesopores and the average pore size is about 50 nm. The specific surface areas variedfrom 345.5 to 615.5 m2/g with (SBET)MAX = 615.5 m2/g with 20wt% Zirconia; Moreover a mass of Si-O-Zrbands formed in the aerogels and the formation mechanism of Si-O-Zr bands are also discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2282.pdf
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