1. Department of Materials Chemistry; National Institute of Chemistry; Hajdrihova 18 Ljubljana 1000 Slovenia
2. Department of Colloid Chemistry; Max Planck Institute of Colloids and Interfaces; Potsdam 14424 Germany
3. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH; Hahn-Meitner-Platz 1 Berlin 14109 Germany
4. Department for Nanostructured Materials; Jožef Stefan Institute; Jamova c. 39 Ljubljana 1000 Slovenia
5. Department of Chemistry; Ben-Gurion University of the Negev; Mailbox 653 Beer-Sheva 84105 Israel