1. Department of Chemistry and Institute for Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Heverlee (Belgium)
2. Max‐Planck‐Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz (Germany)
3. Nano‐Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark), Fax: (+45) 353‐20‐322