1. University of Potsdam, Institute of Chemistry, Karl-Liebknecht-Str. 24-25, 14476, Potsdam, Germany
2. Fraunhofer Institute for Applied Polymer Research IAP, Geiselbergstr. 69, 14476 Potsdam, Germany
3. University of Jyväskylä, Department of Physics and Nanoscience Center, P.O. Box 35, Fi-40014 Jyväskylä, Finland