[1] Newcastle Univ Singapore, Chem Engn, 537 Clementi Rd 6-01,SIT Ngee Ann Polytech Bldg, Singapore 599493, Singapore
[2] Univ Tunku Abdul Rahman, LKC Fac Engn & Sci, Dept Chem Engn, Jalan Sungai Long, Kajang 43500, Selangor Darul, Malaysia
[3] Univ Tunku Abdul Rahman, LKC Fac Engn & Sci, Dept Elect & Elect Engn, Jalan Sungai Long, Kajang 43500, Selangor Darul, Malaysia