1. Institute of Biomedical Materials and Engineering; College of Chemistry and Chemical Engineering; College of Materials Science and Engineering Qingdao University Qingdao 266071 China
2. State Key Laboratory of Bio-Fibres and Eco-Textiles Qingdao University Qingdao 266071 China
3. Centre for Bio nanoengineering and Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China