1. Membrane Science and Technology group; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
2. Films in Fluids/Inorganic Membranes group; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
3. Materials Science and Technology of Polymers group; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
4. MESA Department of Science and Technology; Institute for Nanotechnology; P.O. Box 217 7500 AE Enschede The Netherlands