1. Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands, Faculty of Chemistry, Jagiellonian University, Ingardena 3, PL-30-060 Cracow, Poland, and Institute for Bioengineering of Catalonia (IBEC), c/Baldiri Reixac 13, 08028 Barcelona, Spain