Thermal stability of aluminium oxides prepared from gel

Low-Temperature Formation of α-Alumina by Doping of an Alumina-Sol

“…This difference in ␣-alumina formation temperature may be attributed to the difference in their initial crystallinity (13,14). The XRD pattern of the alumina-sol dried at room temperature (shown in Fig.…”

Effect of embedding MgO and Al2O3 nanoparticles in the precursor on the pore characteristics of PAN based activated carbon nanofibers

“…Metal and metal oxide nanoparticles increase the specific surface area and pore volume of ACNFs through their catalytic activity during pyrolysis of the precursor [6][7][8][9]. It is worth mentioning that as far as gas and liquid adsorption capacity of composite ACNFs is concerned, metal oxides show superiority over metals due to their high thermal stability at elevated temperatures [5,10,11]. Oh et al [1] found that embedding manganese nanoparticles in the precursor enhances the specific surface area and pore volume of ACNFs, leading to a higher toluene adsorption capacity.…”

The oxidation of aluminum at high temperature studied by Thermogravimetric Analysis and Differential Scanning Calorimetry.

“…2,3 The amorphous oxide transforms into γ-alumina once the critical thickness is approached or when the temperature becomes sufficiently high. Since the density of γ-alumina is greater than that of amorphous alumina, 4 and the smallest γ-alumina crystallites have a size of about 5 nm, 5 if the thickness of the amorphous layer was less than 5 nm, the newly formed γ-alumina crystallites are no longer able to form a continuous layer covering the aluminum surface. Consequently, the beginning of stage II (ca.…”