1. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.
2. Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA.
3. Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA.
4. Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
5. Wallenberg Wood Science Centre, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.