1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
2. Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures, School of Life Sciences, Tianjin University, Tianjin 300071, P. R. China
3. School of Health Sciences and Biomedical Engineering, Hebei University of Technology, Tianjin 300130, P. R. China