[Zurück]

M. Lomoschitz, S. Baumann, K. Zorn, H. Peterlik, U. Schubert:
"Ti-ALKOXO-OXIMATES: NEW PRECURSORS FOR MESOPOROUS TiO2 AND MIXED OXIDE SOL-GEL FILMS";
Poster: 13. Österreichische Chemietage, Wien; 24.08.2009 - 27.08.2009; in: "13. Österreichische Chemietage", (2009), ISBN: 978-3-900554-66-8; 1 S.

Because of the high surface area, controllable and adjustable pore size and narrow pore size distribution, sol-gel materials have potential applications in catalysis, separation and sensing. Mixed oxide films and powders play an important role as sensors, catalysts and as supports for catalytically active species. We used titanium alkoxo-oximates bearing hydrocarbon chains of different lengths as precursors for the formation of solgel films. The oximate compound was not only used as an agent to control and slow down the hydrolysis and condensation rate of the Ti-alkoxide during sol-gel processing, but also to serve as a porogen due to its long hydrocarbon chain. Ti-alkoxo-oximates were utilized to create mesoporous TiO₂ films, and further its compatibility with other precurors for mixed-oxide films was investigated. The interactions between oximate ligands and Ti were explored by extraction with organic solvents and calcination. Spectroscopic methods such as NMR or IR were used for qualitative monitoring of the organic functionalities and the removal of the oximate ligands. Thermogravimetric analysis (TGA) was used to quantify the oximate residue after different removal steps. Nitrogen sorption measurements at 77 K were performed after each oximate removal step and used for evaluation of surface area and pore shape. Crystallinity and the prsence of basic structural units of the final film were demonstrated using XRD and SAXS measurements. The film mesostructures were characterized by GI-SAXS. The effect of different organic functionalities, different metal sites, the influence of different templates used during film formation and the factor of surface area in the final material was studied using temperature programmed desorption (TpD) hyphenated mass spectroscopy of toluene.

Projektleitung Ulrich Schubert:
Sol-Gel Beschichtungen zur Adsorption von Kontaminationen unter Weltraumbedingungen