1. College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, People’s Republic of China
2. Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA
3. Department of Stem Cell Biology and Regenerative Medicine, University of Southern California, Los Angeles, California 90033-1425, USA