1. Faculty of Science
2. Chemistry Department
3. Helwan University
4. Cairo 11795
5. Egypt
6. Università degli Studi di Milano
7. Dip. Chimica and INSTM-UdR Milano
8. 20133 Milano
9. Italy
10. Department of Inorganic Chemistry
11. National Research Centre
12. Giza 12622
13. Nanomaterials and Nanotechnology Department
14. Advanced Materials Division
15. Central Metallurgical R & D Institute (CMRDI)
16. 11421 Cairo