1. Department of Engineering and Chemical Sciences; Karlstad University; SE-651 88 Karlstad Sweden
2. Stora Enso, Karlstad Research Centre; SE-650 09 Karlstad Sweden
3. Department of Engineering and Physics; Karlstad University; SE-651 88 Karlstad Sweden
4. Department of Civil, Chemical, Environmental and Materials Engineering, Alma Mater Studiorum; University of Bologna; I-40131 Bologna Italy