Ultrafiltration conducting membranes and coatings from redispersable, nanoscaled, crystalline SnO2:Sb particles
| Autor: | Christian Goebbert, Michel A. Aegerter, Helmut Schmidt, Rüdiger Nass, Detlef Burgard |
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| Rok vydání: | 1999 |
| Předmět: |
Aqueous solution
Materials science Zinn Ultrafiltration Mineralogy Sintering Trennverfahren General Chemistry Thermal treatment Membran Antimon Membrane Electrical resistance and conductance Chemical engineering Electrical resistivity and conductivity visual_art Materials Chemistry visual_art.visual_art_medium Wässrige Lösung Ceramic ddc:620 Sol-Gel-Verfahren Porosity |
| Zdroj: | Journal of Materials Chemistry. 9:253-258 |
| ISSN: | 1364-5501 0959-9428 |
| DOI: | 10.1039/a805082a |
| Popis: | Inorganic membranes prepared by the sol-gel method are promising candidates for use as filters in separation processes. Conducting supported membranes and coatings have been produced from redispersable nanoscaled crystalline Sb-doped SnO2 powders with Sb contents up to 10 mol%. The crystalline particles (ca. 4 nm) are fully redispersable in aqueous solution at ph ≥ 8 with a solid content up to 37 vol.% and are monosized. After thermal treatment at different temperatures and times, the pore size diameter of such a powder can be adjusted from 4-20 nm with a very narrow pore size distribution (ca. ±1 nm) and a total porosity of 63%, practically independent of the sintering parameters. Uniaxial compacted substrates (unsupported membranes) present similar characteristics but with a larger pore size distribution (± 5 nm) and 80% total porosity. Their electrical resistance decreases with sintering temperature and time to 4 Ω (800 °C, 8 h). Crack free transparent conducting coatings on glasses and ceramics have been obtained by spin-coating using fully dispersed aqueous solutions of the powder with volume content up to 7.8%. After thermal treatment (1 h at 550 °C) single layers 200 nm thick are still porous and exhibit specific electrical resistivity as low as p = 2.5 x 10-2 Ω cm with 90% transmission in the visible range. |
| Databáze: | OpenAIRE |
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