1. Laboratory of Industrial Chemistry, Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FIN-20500 Åbo/Turku, Finland, Department of Chemistry, University of Joensuu, P.O. Box 120, FIN-08101 Joensuu, Finland, Department of Physics, University of Turku, Vesilinnantie 5 20014, Turku, Finland, and Neste Oil Oy, POB 310, FIN-06101 Porvoo, Finland