1. Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Gansu Province School of Stomatology, Lanzhou University, Lanzhou 730000, China
2. Polymer Program, Institute of Materials Science and Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China