1. Cellulose and Paper Department and Advanced Materials and Nanotechnology Group; Centre of Excellence for Advanced Sciences, National Research Centre; 33 El Bohouth Street, Doki PO 12622 Giza Egypt
2. Egypt Nanotechnology Centre, El-Sheik Zayed; 6 of October City Egypt
3. Chemistry Department, Faculty of Science and Arts, Jouf University, KSA. On leave from: Inorganic Chemistry Department, National Research Centre; 33 El-Bohouth Street, Dokki Giza 12622 Egypt
4. Physical Chemistry Department, National Research Centre; 33 El Bohouth Street, Doki PO 12622 Giza Egypt