[1] ASTAR, Inst Chem & Engn Sci Ltd, 1 Pesek Rd, Singapore 627833, Singapore
[2] Qingdao Univ Sci & Technol, Coll Automat & Elect Engn, 99 Songling Rd, Qingdao 266061, Shandong, Peoples R China
[3] Natl Univ Singapore, Dept Chem & Biomol Engn, 10 Kent Ridge Crescent, Singapore 119260, Singapore