1. College of Textiles & Clothing
2. Qingdao University
3. Qingdao 266071
4. P. R. China
5. State Key Laboratory of Bio-Fibers and Eco-Textiles & College of Physics
6. Division of Materials Science
7. Department of Engineering Sciences and Mathematics
8. Luleå University of Technology
9. SE-971 87 Luleå
10. Sweden and Department of Molecular Sciences and Nano Systems