1. Institute of Macromolecular Compounds, Russian Academy of Sciences 31 Bolshoy pr., 199004 St.-Petersburg, Russia
2. Laboratory of Physical Chemistry and Colloid Science, Wageningen University, The Netherlands
3. Service de Physique de l’Etat Condensé CEA Saclay, 91191 Gif-sur-Yvette Cedex, France, and
4. Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux, UMR 5254 CNRS/UPPA, Pau, France