Oxide-carbon composites and porous oxides prepared via water-swellable polymer networks
- State Univ. of New York, Buffalo, NY (United States)
Water-swellable polymer networks (WSPN) were employed as media for lodging metal nitrate salts or partially hydrolyzed tetraethyl orthosilicate (TEOS), which are precursors for inorganic oxides. The loading achieved either via the polymerization of a suitable monomer and a cross-linker in an aqueous solution of the precursor or, in the case of TEOS, via the simultaneous polymerization of both monomers. The pyrolysis of the precursor loaded network under N{sub 2} flow generated interpenetrating networks of carbon and metal oxide. The combustion of the composite in air removed the carbon network and a porous metal oxide framework remained. On the basis of the methodology, a coating layer of C-SiO{sub 2} composite was generated on a carbon-fiber, and a porous powders of SiO{sub 2}, ZrO{sub 2}, MgO, and CuO-ZnO-Al{sub 2}O{sub 3} oxide(s) were synthesized. It was found that the specific surface area of the oxides is affected by the nature of the WSPN. Two methodologies which lead to particles were developed. In one of them, sedimentation polymerization, large particles of about 1 mm size were obtained. In the other one, which starts from an emulsion of a water solution in an organic liquid (toluene, cyclohexane), micrometer size particles were prepared. 16 refs., 10 figs., 6 tabs.
- OSTI ID:
- 369918
- Journal Information:
- Chemistry of Materials, Vol. 8, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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