Xuehai Yan1,2,3, Helmuth Möhwald4. 1. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190, China. 2. Center for Mesoscience, Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190, China. 3. University of Chinese Academy of Sciences , Beijing 100190, China. 4. Max Planck Institute of Colloids and Interfaces , Am Mühlenberg 1, 14476 Potsdam/Golm, Germany.