1. EMPA, Swiss Federal Laboratories for Materials Science and Technology; Laboratory for Mechanics of Materials and Nanostructures; Feuerwerkerstrasse 39 CH-3602 THUN Switzerland
2. Institut Européen des Membranes (UMR CNRS 5635); Université Montpellier 2, Place Eugène Bataillon; 34095 Montpellier France