[Zurück]

M. Raza, G. Kickelbick:
"Surface-Functionalization Of Titania Nanoparticles By Organic Surfactants And Investigation Of Their Photocatalytic Stability";
Poster: 13. Österreichische Chemietage, Wien; 24.08.2009 - 27.08.2009; in: "13. Österreichische Chemietage", (2009), ISBN: 978-3-900554-66-8; 1 S.

In recent years, TiO₂ has been studied extensively as photocatalyst to deal with environmental pollution and water purification. The light-induced redox reaction at the surface of photocatalytic titania nanoparticles often results in the decomposition of organic compounds. We investigated the synthesis of photocatalytically active anatase titania nanoparticles and their surface-functionalization with molecules that interact with the surface by different anchor groups. In a first step anatase nanoparticles were synthesized through the sol-gel method. The obtained monodispersed particles were functionalized with sodium dodecylsulphate (SDS), dodecyl carboxylic acid (DDA), dodecyl amine (DDAmine) and dodecylphosphonic acid (DPA). Different concentrations of each surfactant were used under varying pH values to optimize the conditions for surface coverage. The bonding modes and percentage of surface coverage of the obtained titania nanoparticles were investigated applying FT-IR, TGA and elemental analysis. The results show that SDS, DDA and DDAmine are bonded to the titania surface through electrostatic interaction where as DPA is bonded through covalent interaction. UV Stability of these surface modifications was investigated by exposing them to UV light. These modifications were repeated in Pickering emulsions as well to investigate anisotropic surface-functionalization of titania nanoparticles.

Projektleitung Guido Kickelbick:
Synthese von Titandioxid-basierten Janus Nanopartikeln und ihre Oberflächen-Funktionalisierung (Nano-Initiative N1001-NAN)