Observation of Aging Effect on One Step Direct Injection Flame Synthesized Nano Alumina

The nano alumina particles were produced by instant and continuous one step Direct Injection Flame Synthesis (DIFS). The synthesized nanoparticles were highly crystalline with orthorhombic size of crystal structure belonging to the space group of P222. The nano alumina particle has a crystallite 36 nm and the particle radius is calculated to be 24 nm. The synthesized nano alumina particle exhibits a spherical morphology with different radius. The particles were subjected to controlled aging process and the formation of encapsulation layer is reported. The thickness of the encapsulation layer is found to be ~ 4.5 nm.