Junling Guo1,2, Bruno D Mattos3, Blaise L Tardy3, Vanessa M Moody4, Gao Xiao2,5, Hirotaka Ejima6, Jiwei Cui1, Kang Liang7,8,9, Joseph J Richardson6,10. 1. Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education, Shandong University, Jinan, Shandong 250100, China. 2. Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts, 02115, United States. 3. Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P. O. Box 16300, FI-00076, Finland. 4. Department of Bioengineering, School of Engineering and Applied Sciences, University of Pennsylvania, Pennsylvania 19104, United States. 5. Harvard-MIT Division of Health Sciences and Technology, Harvard Medical School, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States. 6. Department of Materials Engineering, the University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan. 7. School of Chemical Engineering, The University of New South Wales, Sydney, New South Wales, Australia. 8. Graduate School of Biomedical Engineering, University of New South Wales, Sydney, New South Wales, Australia. 9. Australian Centre for NanoMedicine, The University of New South Wales, Sydney, New South Wales, Australia. 10. Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria, Australia.