[1] Lulea Univ Technol, Div Mat Sci, Lulea, Sweden
[2] Univ Oulu, Fiber & Particle Engn, SF-90100 Oulu, Finland
[3] Swiss Fed Labs Mat Sci & Technol, Empa, Appl Wood Mat Lab, Dubendorf, Switzerland
[4] Royal Inst Technol KTH, Sch Biotechnol, AlbaNova Univ Ctr, Stockholm, Sweden