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alumina spheres are widely used as adsorbents and have an inherent crush strength that is significantly greater than that of silica or Drierite(tm). In addition, alumina spheres exhibit superior surface chemistry characteristics when compared to other desiccant media. These properties allow for the removal of a wide range of hydrocarbons and other liquids in industrial applications.
Porous micro- and nanostructured materials with desired morphologies and tunable pore sizes are of great interest due to their broad applications in various fields such as environmental remediation, energy storage, and catalyst supports. In this study, a new type of rattle-type carbon-alumina core-shell spheres were synthesized by a simple one-pot hydrothermal synthesis and calcination process. The resulting microstructure, morphology, and chemical composition were characterized using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), 13C solid state NMR, and N2 adsorption-desorption techniques.
The alumina spheres were coated with hydroxyapatite to form alumina-hydroxyapatite composites. The alumina-HAp composites demonstrated good adhesion to the alumina matrix and high mechanical strength, as indicated by their double module of Young’s ratio, which is significantly higher than that of the pure alumina spheres (272 +/- 195 N). Compositional analysis of the half-cut alumina-HAp spheres was performed by EDX_SEM, which shows 2 phases, the central one consisting of the alumina layer and the peripheral ones composed of flake-shaped HAp crystals. The elemental distribution showed the presence of calcium, phosphorus, aluminum, and oxygen in both phases.
