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|Title:||Ultrafiltration conducting membranes and coatings from redispersable, nanoscaled, crystalline SnO2:Sb particles|
Aegerter, Michel A.
Schmidt, Helmut K.
|Year of Publication:||1999|
|OPUS Source:||Journal of materials chemistry. - 9. 1999, 1, S. 253-258|
|SWD key words:||Ultrafiltration|
|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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