Please use this identifier to cite or link to this item: doi:10.22028/D291-24617
Title: Ultrafiltration conducting membranes and coatings from redispersable, nanoscaled, crystalline SnO2:Sb particles
Author(s): Goebbert, Christian
Aegerter, Michel A.
Burgard, Detlef
Nass, Rüdiger
Schmidt, Helmut K.
Language: English
Year of Publication: 1999
OPUS Source: Journal of materials chemistry. - 9. 1999, 1, S. 253-258
SWD key words: Ultrafiltration
Wässrige Lösung
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: 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.
Link to this record: urn:nbn:de:bsz:291-scidok-29260
Date of registration: 6-Jul-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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