[Zurück]

M.-A. Néouze, M. Litschauer, M. Puchberger, H. Peterlik:
"Porous Titania Ionic Nanoparticle Networks";
Poster: EUROMAT 2011, Montpellier; 12.09.2011 - 15.09.2011; in: "EUROMAT 2011 - European Congress on Advanced Materials and Processes", (2011), 1 S.

Porous materials are strongly investigated for many applications like gas storage or gas sequestration. For these applications special interest and focus is given to microporous materials, with pore diameter smaller than 2 nm, or materials with small mesoporous, pore diameters slightly larger than 2 nm. In this context, numerous hybrid inorganic-organic structures were reported, such as, metal-oxide open frameworks, MOF. In MOF, the metal centre, in its oxide form, is accessible. It was evidenced that the nature of the organic linker played a considerable role onto the gas adsorption properties. For example having ionic linkers may enhance the adsorbent - adsorbate interactions through charge- induced forces. Thus, the presence of ionic groups has been proven to be advantageous either for enhancing the solubility of the final compound and / or for better gas sorption. In particular, ionic liquid-mimic linkers were pointed out to be extremely interesting. Especially the high affinity of carbon dioxide for imidazolium moieties was largely investigated. This communication will report on the synthesis of titania nanoparticle networks. These nanoparticle networks were synthesized by the reaction between imidazole and alkyl halide functionalized anatase nanoparticles. The reaction produced imidazolium bridging units between the nanoparticles which were observed by the means of CP MAS 15N NMR spectroscopy. The porous characteristics of the obtained nanoparticle network were investigated with nitrogen sorption experiments. From these experiments, a high surface area originating from small mesopores was observed. These results were confirmed by small angle X-ray diffraction experiments.

Projektleitung Marie-Alexandra Néouze:
Ionische Verknüpfung von Nanopartikeln