Abstract
Silica nanotubes, foams and ordinary mesoporous silica have been synthesized by the controlled hydrolysis of tetraethyl orthosilicate in the presence of various organic agents. The effects of mechanical pressure were studied by subjecting the samples up to 9 ton/cm2 pressure. Surface fractal properties were investigated by analysis of the N2 adsorption−desorption isotherms by the Frenkel−Halsey−Hill equation and the Wang method. We have found that while amorphous mesoporous silica has a definitely self-similar surface, silica nanotubes and foams can be considered nonfractal with Dfract ∼ 2 and Dfract ∼ 3, respectively.
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