1. Chemistry Department, Faculty of Science, Ain Shams University, Cairo 11566, Egypt
2. Department of Chemistry, Faculty of Women for Arts, Science and Education, Ain Shams University, Cairo, Egypt
3. Aeromedical Council Laboratories-Ministry of Civil Aviation, Cairo, Egypt
4. Polymer Materials Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientifc Research and Technological Applications (SRTA-City), New Borg El-Arab City, P. O. Box: 21934, Alexandria, Egypt