1. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
2. Chalmers Materials Analysis Laboratory, Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden
3. RISE Research Institutes of Sweden, Box 104, 43122 Mölndal, Sweden
4. Wallenberg Wood Science Center, Chalmers University of Technology, Gothenburg, Sweden