1. Sino‐German Joint Research Lab for Space Biomaterials and Translational TechnologySchool of Life SciencesNorthwestern Polytechnical University Xi'an Shaanxi 710072 P. R. China
2. College of Chemistry and Chemical EngineeringHunan University Changsha Hunan 410082 P. R. China
3. Institute of Biomedical Materials and EngineeringNorthwestern Polytechincial University Xi'an Shaanxi 710072 P. R. China