1. Center of Excellence Geopolymer and Green Technology (CEGeoGTech)
2. School of Materials Engineering
3. Universiti Malaysia Perlis
4. 02600 Arau
5. Malaysia
6. Department of Inorganic Chemistry
7. University of Bayreuth
8. Bayreuth
9. Germany
10. School of Fundamental Science
11. Universiti Malaysia Terengganu
12. 21030 Kuala Terengganu