1. Faculty of Engineering, Østfold University College, P.O. Box 700, Halden 1757, Norway
2. Department of Chemistry & Center for Pharmacy, University of Bergen, P.O. Box 7803, Bergen 5020, Norway
3. Department of Construction, Energy and Materials Technology, The Arctic University of Norway, P.O. Box 6050 Langnes, Tromsø N-9037, Norway