Silicon-titanium oxycarbide glasses as bimodal porous inorganic membranes

R. Peña-Alonso, L. Téllez, A. Tamayo, F. Rubio, J. Rubio, J. L. Oteo

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Porous oxycarbide Si-Ti-O-C glasses have been studied as potential materials for inorganic membranes. Such materials were prepared by pyrolysis of hybrid materials in nitrogen atmosphere. These hybrids were synthesized by the sol-gel process using tetraethylortosilicate (TEOS), polydimethylsiloxane (PDMS) and titanium orthotitanate (TBOT) as raw material. The influence of the TEOS/TBOT molar ratio on the pore size distribution has been studied in the range of pyrolysis temperatures between 400 and 1100 °C. The oxycarbide materials were characterized by FT-IR and NMR spectroscopies, XRD, mercury porosimetry, nitrogen adsorption and SEM. Bimodal pore size distributions showed one mode close to 0.02 μm and the other one in the range between 1 and 100 μm of pore diameter. Such pore sizes increase with the amount of TBOT. Reduced effective diffusivities were calculated by a theoretical model taking into account the mentioned pore size distributions. Diffusivities appeared in the range from 0.46 to 0.77 and increase with the titanium concentration in the oxycarbide. © 2006 Elsevier Ltd. All rights reserved.
Original languageAmerican English
Pages (from-to)969-973
Number of pages871
JournalJournal of the European Ceramic Society
StatePublished - 1 Jan 2007


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