1. Institute of Chemical Engineering Ulm University Albert-Einstein-Allee 11 D-89069 Ulm Germany
2. Faculty of Production Engineering University of Bremen Badgasteiner Straße 1 D-28359 Bremen Germany
3. Institute of Solid State Physics University of Bremen Otto-Hahn-Allee 1 D-28359 Bremen Germany
4. Leibniz Institute for Materials Engineering IWT Badgasteiner Straße 3 D-28359 Bremen Germany