1. Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, Minden, Malaysia
2. Pharmacy Department, Faculty of Medical Science, Yemen University, Sana’a, Yemen
3. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan, People’s Republic of China
4. Faculty of Science & Engineering, Soka University, Hachioji, Tokyo Japan