1. Institute
of Physics, University of Freiburg, Herman Herder Str. 3, Freiburg, 79104, Germany
2. Ingénierie
des Matériaux Polyméres IMP - UMR CNRS 5223, Université Claude Bernard Lyon 1, Villeurbanne Cedex 69622, France
3. Institut Charles
Sadron CNRS, UPR 22, rue du Loess - BP 84047, F-67034, Strasbourg Cedex 2, France
4. Freiburg
Center of Interactive Materials and Bioinspired Technologies, University of Freiburg, 79110 Freiburg, Germany
5. Freiburg
Materials Research Center, University of Freiburg, 79104 Freiburg, Germany