1. Beijing
Key Laboratory of Materials Utilization of Nonmetallic Minerals and
Solid Waste, National Laboratory of Mineral Materials, School of Materials
Sciences and Technology, China University of Geosciences, Beijing 100083, P. R. China
2. Department
of Materials Science and Engineering, and Key Laboratory of Polymer
Chemistry and Physics of Ministry of Education, College of Engineering, Peking University, Beijing 100871, P. R. China