1. Key Laboratory of Textile Science & Technology; Ministry of Education, College of Textiles; Donghua University; Shanghai 201620 P. R. China
2. College of Materials Science and Engineering; Donghua University; Shanghai 201620 P. R. China
3. Key Laboratory of Superlight Materials and Surface Technology; Ministry of Education; College of Materials Science and Chemical Engineering; Harbin Engineering University; Harbin 150001 P. R. China
4. Department of Materials Science and Engineering; College of Engineering; Peking University; Beijing 100871 P. R. China