1. University of Stuttgart Institute of Chemical Engineering Böblinger Str. 78 70199 Stuttgart Germany
2. Justus Liebig University Gießen Institute for Physical Chemistry Heinrich Buff Ring 17 35392 Gießen Germany
3. Walter E. C. Pritzkow Spezialkeramik Adam Opel Str. 6 70794 Filderstadt–Sielmingen Germany