Effect of co-solvent on structural and morphological properties of ZnO aerogel prepared by a modified sol-gel processMalaaz Meddouri, Djamel Djouadi, Azeddine Chelouche, Tahar Touam and Abdelhamid CherguiEur. Phys. J. Appl. Phys., 66 1 (2014) 10402DOI: https://doi.org/10.1051/epjap/2014140061