Affiliation: | 1. Department of Physics and Fribourg Center for Nanomaterials University of Fribourg Ch. du Musée 3, 1700 Fribourg (Switzerland);2. Institute of Polymers, Department of Materials, ETH Zurich Wolfgang‐Pauli‐Strasse 10, HCI G 525 8093 Zurich (Switzerland);3. Néstlé Research Center Vers‐Chez‐Les‐Blanc 1000 Lausanne 26 (Switzerland) |