1. Department of Materials Science, Bahir Dar University, Bahir Dar, Ethiopia
2. Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali, Università degli Studi di Messina, Via Consolare Valeria 1 (Azienda Ospedaliera Universitaria Policlinico “G.Martino”), 98125 Messina, Italy
3. CNR-IPCF, Viale F. Stagno d’Alcontres, 37-98158 Messina, Italy
4. School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X01, Scottsville, 3209 Pietermaritzburg, South Africa
5. Department of Polymer Science, University of Akron, Akron, Ohio United States