Abstract
Alumina nanoparticles were synthesized following hydrothermal process at 170°C for 6 h, using glucose and other water‐based precursor materials. The uncalcined and calcined (550°–1200°C) particles were characterized by differential thermal analysis, thermogravimetry, Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and multipoint Brunauer–Emmett–Teller (BET) surface area. The microstructures of the calcined (at 550°C) particles were examined by field‐emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). XRD and FTIR studies revealed that gamma‐alumina (γ‐Al2O3) persisted up to 1000°C followed by the appearance of alpha‐alumina (α‐Al2O3) at 1200°C. BET surface area analysis confirmed that the specific surface area of γ‐Al2O3 was higher compared with α‐Al2O3. Because of particle agglomeration, the crystallite sizes obtained by the BET method showed larger values than those determined by the XRD method for the samples calcined at 550°–1200°C. For 550°C‐treated sample, FESEM micrograph showed the aggregated particles of size 20–80 nm, while TEM image of the same sample revealed a particle size of 5–10 nm.
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