Engineering and photostability study of aluminum , carbon and silicon carbide nanoparticles synthesized via mechano-chemical route / Mohamed Saad Aly ; Supervised Elsayed Abdelmagied Elsherbini , Mona Bakr Mohamed , Iman Abdelfattah Ghoneim

Thesis (Ph.D.) - Cairo University - National Institute of Laser Enhanced - Department of Laser Application in Environmental Metrology Photochemistry and Agriculture

Mechanical milling technique has been employed using either mechanochemical , dry milling or wet milling route to prepare aluminum, carbon and silicon carbide nanostructures. In the present work, aluminum nanoparticles have been synthesized via a mechanochemical reaction between sodium metal and aluminum chloride in which the average size of the synthesized nanoparticles was about 30 nm. On the other hand, wet milling of aluminum flake powders was performed for 50 hours in the presence of 1,4 dioxane, 2-ethylhexanol or kerosene under ambient atmosphere to get different sizes of aluminum nanoparticles ranged from 235 to 860 nm with a valuable amount of aluminum oxide. Wet milling was also employed for 50 h in the presence of kerosene under argon to obtain aluminum nanoparticles preserved under kerosene with average size about 50- 80 nm with less amount of aluminum oxide. In the same manner, graphite powders have been milled via the wet milling method in the presence of either kerosene or 2-ethylhexanol as milling solvents. Graphene sheets were successfully exfoliated by this route having few layers with considerable amount of defects. Unlike wet milling, dry milling of graphite was performed to prepare particulated nanocarbon with average size about 50 nm

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