1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576
2. Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602
3. Institute of Multifunctional Materials (IMM), Laboratory of New Fiber Materials and Modern Textile, College of Chemistry, Chemical Engineering and Environment, Qingdao University, Qingdao 266071, PR China
4. Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth WA 6845, Australia