1. Max-Planck-Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Golm, Germany; Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus c, Denmark; Frauhofer Institute for Applied Polymer Research, Geiselbergstr. 69, 14476 Golm, Germany; and Stranski-Laboratory for Physical and Theoretical Chemistry, Technical University of Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany