1. DWI an der RWTH Aachen e.V. Functional and Interactive Polymers; Institute of Technical and Macromolecular Chemistry; RWTH Aachen University; Forckenbeckstrasse 50 D-52056 Aachen Germany
2. II. Institute of Physics; RWTH Aachen University; Otto-Blumenthal-Strasse D-52056 Aachen Germany