1. Department of Chemical Engineering; Universiti Teknologi Petronas; Bandar Seri Iskandar Perak 32610 Malaysia
2. Department of Fundamental and Applied Sciences; Universiti Teknologi Petronas; Bandar Seri Iskandar Perak 32610 Malaysia
3. School of Chemical Engineering; Universiti Sains Malaysia; 11800 USM, Pulau Pinang Malaysia