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M. Litschauer, M.-A. Néouze:
"Nanoparticles connected through an ionic linker";
Talk: E-MRS Fall Meeting 2008, Warschau / Polen (invited); 2008-09-15 - 2008-09-19.

The 2D or 3D linking of metal or metal oxide nanoparticles is still a challenge, as well as research concerning the association of ionic species with nanoparticles. The originality of presented work lies in the combination of nanoparticles organization and concomitantly the introduction of ionic species. The two synthesis methods reported are related to the nucleophilic substitution taking place during the synthesis of imidazolium-based ionic liquids. The first approach utilized bis(trialkoxysilyl)-substituted imidazolium iodide to link the silica nanoparticles. In the second approach, the silica nanoparticles were first modified either by 3-chloropropyltrimethoxysilane or N-(3-trimethoxysilylpropyl)imidazol and then coupled through nucleophilic substitution. A comparison of both approaches shows that the second approach results in a more efficient linkage of nanoparticles. Furthermore, it is a new and original method for letting modified nanoparticles react with one another. This will result in covalently linking nanoparticles by means of an ionic linker and is characterized by using TGA, solid state NMR and TEM.