1. State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences 1 North 2nd Street, Zhongguancun, Haidian District Beijing 100190 P. R. China
2. University of Chinese Academy of Sciences 19A Yuquan Road Beijing 10049 P. R. China
3. Laboratory of Bio-Inspired Materials and Interface Sciences Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
4. Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China