1. Centre for Ionic Liquids, University of Malaya, Kuala Lumpur, Malaysia
2. Department of Chemical Engineering, University of Malaya, Kuala Lumpur, Malaysia
3. Nanotechnology and Catalysis Research Centre (NANOCAT), University of Malaya, Kuala Lumpur, Malaysia
4. Department of Civil Engineering, University of Malaya, Kuala Lumpur, Malaysia