1. School of Materials Science and Engineering
2. Tianjin University
3. Tianjin 300072
4. P. R. China
5. College of Chemistry and Molecular Engineering
6. Peiking University
7. Beijing 100871
8. State Key Laboratory of Polymer Physics and Chemistry
9. Changchun Institute of Applied Chemistry
10. Chinese Academy of Sciences
11. Changchun 130022
12. Department of Chemical Engineering and Waterloo Institute for Nanotechnology (WIN)
13. University of Waterloo
14. Waterloo
15. Canada