1. Department of Chemistry and Chemical Engineering; Chalmers University of Technology; SE-412 96 Göteborg Sweden
2. Department of Chemistry; Addis Ababa University; P.O. Box 33658 Addis Ababa Ethiopia
3. CAS Key Laboratory of Bio-based Materials; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 China
4. State Key Laboratory for Mechanical Behavior of Materials; Xi'an Jiaotong University; Xi'an 710049 China