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Title

Silicon–titanium oxycarbide glasses as bimodal porous inorganic membranes

AuthorsPeña-Alonso, Raquel ; Téllez-Jurado, Lucía; Tamayo Hernando, Aitana ; Rubio Marcos, Fernando ; Rubio Alonso, Juan ; Oteo Mazo, José Luis
KeywordsSol–gel process
Nanocomposite
Issue Date2007
PublisherElsevier
CitationJournal of the European Ceramic Society 27 (2007) 969–973
AbstractPorous 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 andNMRspectroscopies, XRD, mercury porosimetry, nitrogen adsorption and SEM. Bimodal pore size distributions showed one mode close to 0.02 m and the other one in the range between 1 and 100 m 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.
Publisher version (URL)doi:10.1016/j.jeurceramsoc.2006.04.130
URIhttp://hdl.handle.net/10261/17393
DOIhttp://dx.doi.org/10.1016/j.jeurceramsoc.2006.04.130
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