1. Bio-inspired and Smart Materials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 207, 7500 AE Enschede, The Netherlands
2. Fraunhofer Institute
for Applied Polymer Research, Geiselbergstr. 69, 14476 Potsdam, Germany
3. Physics Department, Saratov State University, Astrakhanskaya 83, Saratov 410012, Russia
4. Chemistry Department, Moscow State University, Lenin Hills 1, Moscow 119991, Russia