In this work, we study three aluminum oxides (alpha, gamma, boehmite) and various oxidized metallic powders to observe their dehydration decomposition behavior using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) scanning electron microscopy (SEM). We find that a temperature increase the (aluminas) reduces physically adsorbed water molecules reveal presence of hydr...

Corundum primary deposits in Greece occur four locations: Paranesti Drama and Gorgona Xanthi, both belonging to the wider Rhodope Massif, as well as, Ikaria island Kinidaros Naxos island, Attic-Cycladic Massif. Eight samples were examined with spectroscopic methods (FTIR, UV-Vis, EDXRF) order better characterize these deposits: two pink sapphires from Paranesti, a blue sapphire Gorgona, three K...

This work presents a fast and direct controlled routine for the fabrication of fully dense alumina based on reactive spark plasma sintering (reactive-SPS) boehmite (γ-AlOOH) nano-powders obtained by sol–gel technique. The evolution transition aluminas during has been studied. Some powders were seeded with α-Al2O3 particles prior to gelation. Boehmite exhibited at 1070 °C, enhancing transformati...

• How different chemical fractionation affect Sardinian Mediterranean-type bauxites. Al2O3 vs SiO2 suggest variability in the epigenetic kaolinite by boehmite replacement. Cerianite micro-spheres and REE-phases are generated oxidising illuvial horizon. R-mode analysis suggests most critical raw materials covary with contents. bauxites could represent a potential source of materials. bauxite dep...

In this study, polyacrylonitrile/cellulose acetate (PAN/CA) composite nanofiber membranes with different boehmite contents are prepared by electrospinning. The physical and electrochemical properties of the membrane as a separator in lithium batteries investigated. contrast to commercial polypropylene (PP), nanocomposite fiber has 3D network structure, higher porosity, thermal stability, electr...