1. School of Chemical Engineering and Materials Science, Chung-Ang University, 221 Heukseok-Dong, Dongjak-Gu, Seoul 156-756, Republic of Korea
2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Xiasha Higher Education Park Avenue 2 No. 928, Hangzhou 310018, China