Influence of Gelation Speed and Calcination on Surface Fractal Dimensions of Silica Xerogels
Huang Wen · Journal of Inorganic Materials · 1999
This paper investigated the effect of gelation speed on the surface fractal dimensions of silica xerogels derived from TEOS(actone as solvent,catalyzed by HCl, pH≈3), and analyzed the influence caused by calcination.The results show that different gelation speeds hardly affect the surface fractal dimensions of the xerogels without calcination,but the surface fractal dimensions of xerogel acquired with slower gelation speed will decrease more after calcinated at 600℃. Generally, the surface fractal dimensions of calcinated silica xerogel can remaine almost unchanged over 800℃.