Chemical Synthesis and Characterization of Nano Alumina, Nano Composite of Carbon–Alumina and Their Comparative Studies

Abstract

Aluminium oxide (Al2O3) nano particles were synthesized by using both the sol gel technique and solid state reaction (SSR) method. Different proportion of nano carbon cones from 0.5% to 3.5% is doped with aluminium nitrate nano hydrate and annealed subsequently at 1000°C for 3 h to synthesize the nano composite of carbon–alumina. The synthesized samples were characterized by X-ray diffraction to identify the presence of different phases and transitions during this process. The average crystallite size of the nano alumina is found to be 45 nm by sol gel and 43 nm by SSR method respectively by Debye–Scherrer method. Average crystallite size and lattice strain of nano alumina are also estimated from Williamson Hall (WH) plot analysis. It is found to be 69 nm with the strain of 3.3×10−3 in sol gel, and in SSR method, it is 72 nm with the strain is 3.9×10−3. The interplanar distance of various planes of alumina are estimated and compared with JCPDS values. Similar analysis has also been extended for the nano composite of carbon–alumina. The surface morphology of the samples are analyzed using scanning electron microscopy and rough estimate of the crystallites is also given. From the Raman analysis, the presence of alpha phase of alumina has been confirmed. The presence of carbon in the composite has been established through diffuse reflectance spectroscopy. The FTIR spectra of the composite samples ensured the presence of Al–O–Al, O–H and C=O bonds.

Sonochemical synthesis of aluminium and aluminium hybrids for remediation of toxic metals

“…2 (c, e and g)). This kind of interconnection is also observed by Krishnan et al, [34] . Furthermore, the indole derivatives provide an additional reactive point for aluminium oxide, resulting in the reorientation of particles and forms the clumps [35] .…”

Effects of Ti6Al4V mechanical and thermal surface modification on the adhesion of a chitosan-bioactive glass coating

“…Instead, from EDS mapping of the GB sample, a great amount of oxygen was detected (Fig. 6a), confirmed by the Raman spectrum with the peak of alumina [24,25], an oxide present in the sample as a processing residue. To confirm this, it is worth noting that the percentage of aluminum in the grit-blasted sample was doubled in relation to the standard value for Ti6Al4V obtained in both polished and milled ones.…”

Alumina dissolution process to fabricate bimodal pore architecture alumina with superior green and sintered properties

“…The spectrum of pure alumina, as suggested by literatures had Raman shift at a slightly lower range, that is, 1300-1400 cm −1 . 44 The observed difference in the peak shift may be related to the crystallinity and to the degree of disorder found in various forms of alumina. Furthermore, the green alumina also shows a broad range peak between 1165 and 1320 cm −1 due to the presence of sulfate complex, as shown in Figure 5B.…”