1. Institute of Hybrid Materials, National Center of International Research for Hybrid Materials Technology, National Base of International Science & Technology Cooperation, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
2. Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, USA
3. Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO 80523, USA