1. Department of Bio- and Chemical Engineering; TU Dortmund; Emil-Figge-Str. 66, D-44227 Dortmund Germany
2. Freiburg Materials Research Center and Institute for Macromolecular Chemistry; Albert-Ludwigs-Universitaet Freiburg; Stefan-Meier-Str. 21, D-79104 Freiburg Germany
3. Henkel AG & Co.; KGaA, Henkelstr. 67, D-40191 Duesseldorf Germany