Article ID Journal Published Year Pages File Type
9777960 Journal of the European Ceramic Society 2005 8 Pages PDF
Abstract
A microporous amorphous silica membrane has been synthesized by thermal conversion in air of polysilazane on a silicon nitride (Si3N4) porous substrate. The porous substrate near the surface layer was penetrated by polysilazane, and converted into mesoporous amorphous silica/Si3N4 composite layer. Then, an active molecular sieving microporous amorphous silica thin layer was synthesized on the surface of the mesoporous composite layer. The polysilazane-derived amorphous silica membrane exhibited H2 permeance of 1.3 × 10−8 mol/m2 s Pa at 573 K, and the permeability ratio of H2/N2 was measured to be 141. The effects of heat treatment condition on the meso/microporous structure development of the polysilazane-derived amorphous silica within the Si3N4 porous substrate are discussed from a viewpoint of fabricating hydrogen-permselective amorphous silica membranes through polymeric precursor route.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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