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SEM images of gels prepared from the starting composition (A): (a) as-made dried gel (without heat treatment); (b) the gel heat-treated at . .
Pore size distributions of gels heat-treated at .
(a) Variation of XRD patterns with heat-treatment temperature for sample (B). (b) Backscattered intensity normalized to the diffuse background as a function of scattering angle for sample (B) heat-treated at varied temperatures.
Backscattered intensity normalized to the diffuse background as a function of scattering angle for gels heat-treated at . A typical CBS result for the macroporous gel prepared by the sol-gel process including phase separation is also shown for comparison (see Ref. 4). The solid curves represent theoretical fits from diffusion approximation (see Ref. 10).
The calculated starting compositions and the gelation temperature of samples. Average pore diameter , porosity , and transport mean free path are also shown for the fully sintered samples heat-treated at .
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