1. Department of Materials and Environmental
Chemistry, Stockholm University, SE-10691 Stockholm, Sweden
2. Department of Applied Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
3. Research Center of Natural Sciences, Hungarian Academy of Sciences, P.O.
Box 77, H-1525, Budapest, Hungary
4. Research Institute of Chemical and Process Engineering,
Faculty of Information Technology, University of Pannonia, P.O. Box 158, H-8201 Veszprém, Hungary
5. Department
of Chemical and Biological Engineering, Chalmers University of Technology, SE-41296 Gothenburg, Sweden