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Titel: Obtenção de membranas não-suportadas de composição 3Al2O3-2SiO2 pelo processo sol-gel
Sonstige Titel: Unsupported membranes of 3Al2O3-2SiO2 composition prepared by sol-gel processs
Verfasser: Simões, Maurício
Bozano, Dorotéia F.
Aegerter, Michel A.
Sprache: Sonstige
Erscheinungsjahr: 1994
Quelle: Anais / 38° Congresso Brasileiro de Cerâmica; 2° Encontro de Mineradores e Consumidores : [18 a 21 de junho de 1994, Blumenau, SC] / Associação Brasileira de Cerâmica. - Vol. 3. - São Paulo, SP : Associação Brasileira de Cerâmica, 1994, S. 1026-1031
SWD-Schlagwörter: Gel
Mullit
Dispersion
Tetraethylsilicat <Tetraethylorthosilicat>
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumentart : InProceedings (Aufsatz / Paper einer Konferenz etc.)
Kurzfassung: -
Colloidal gels of mullite composition (74Al2O3-26SiO2 wt%) have been prepared using aqueous mixture of a colloidal dispersion of boehmite (AlOOH) and TEOS (Si(OC2H5)4) with pH varying between 0,5 to 3,0. After drying at 60°C the gels have been heat treated up to 1100°C. The temperature evolution of porosity has been studied by gas and mercury porosimetry. Dried gels made with pH &#8804; 1,5 show type I isotherm with H4 hysteresis, evidencing microporous structure (diameter (25 Å). This gels heat treated at 500 and 980°C exhibit a narrow monomodul pores distribution with diameter around 40 Å. At higher pH the isotherms are of type II with H2 hysteresis. The pore distribution is larger but the peak maximum is always below 150 Å. The surface area is almost independent of the pH (~250 m2/g) below 980°C and drops to 60-160 m2/g at higher temperature. The sol-gel preparation allows to tailor the porosity of mullite material with unique properties which can be exploited in applications such as filtration, separation, etc..
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-23652
hdl:20.500.11880/24235
http://dx.doi.org/10.22028/D291-24179
SciDok-Publikation: 7-Sep-2009
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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