Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):
M. Litschauer, B. Basnar, M.-A. Néouze:
"Pseudo-click chemistry to build Ionic Nanoparticle Networks: A way toward metamaterials";
Vortrag: 10th International Conference on Materials Chemistry (MC10),
University of Manchester, Manchester, United Kingdom;
- 07.07.2011; in: "10th International Conference on Materials Chemistry (MC10) - Book of Abstracts",
In the past few years we developed new hybrid inorganic-organic materials: Ionic Nanoparticle Networks. These networks are based on the covalent liking of nanoparticles utilizing imidazolium bridging units.
Nanoparticles are modified with either imidazole bearing ligands or alkyl halide moieties. The anchoring of the functionalized ligands to the nanoparticles is achieved by a phosphonic acid or an alkoxysilane group, depending on the chemical nature of the nanoparticles.
After the surface modification, the two functionalized nanoparticles suspensions are mixed, the imidazole units reacting with the alkyl halide groups following a nucleophilic substitution reaction. This reaction leads to the formation of imidazolium halide moieties bridging the nanoparticles. The nucleophilic substitution can be considered as a "pseudo-click-chemistry" reaction and occurs already at low temperature.
The above described procedure was successfully carried out for various metal oxide nanoparticles, giving rise to silica nanoparticle based networks, or titania nanoparticle based thin films. In addition, this pseudo-click-chemistry reaction was also successfully adapted for the synthesis of metamaterials, which are based on the association of different types of nanoparticles, A and B for example. Such materials are a subject of intense research for they should open doors to new exciting materials with application in optics or electronics. One of the major issues to be solved in this field is to find a method for connecting only nanoparticles A with nanoparticles B and not to have a few A-B connections next to a large number of A-A and B-B connections. The pseudo-click-chemistry reaction made provides a very original and simple path towards this goal. Examples with silica and titania will be presented during the presentation.
Projektleitung Marie-Alexandra Néouze:
Ionische Verknüpfung von Nanopartikeln
Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.