Synthese mesoskopisch organisierter Nanopartikel
FacultiesFakultät für Naturwissenschaften
LicenseStandard (Fassung vom 01.10.2008)
The final goal of this work was to develop a simple, low temperature route towards porous, high surface area oxides, e.g. silica, titania and mixed silica-titania, in purely aqueous conditions. In addition, a deliberate access to a phase-pure modification, e.g. rutile or anatase of titanium, was desired. Titania and the mixed metal oxides are of high interest in applications such as electrode material in lithium ion batteries or as heterogeneous support for nanoscale gold particles in the oxidation of carbon monoxide. Silica was chosen as reference system, since its sol-gel chemistry is very well developed. A principle question to be answered in a consortium of the five groups was, whether the diol/polyol-modified precursors can be reacted in purely aqueous conditions to allow for processing in inverse miniemulsions.As a starting point, the diol/polyol-derivatized precursors were synthesized via a simple transalkoxylation reaction of the commercially available metal alkoxides with the corresponding diol/polyol, e.g. ethylene glycol or glycerol.
Subject HeadingsMischoxide [GND]