Munasir, Diah Hari Kusumawati, Sunaryono, Nugrahani Primary Putri, Nurul Hidayat, Ahmad Taufiq, Zainul Arifin Imam Supardi
This article reports the synthesis process of γ-alumina/SiO2 composite from aluminium powders and amorphous nanosilica through the means of tetra-methyl-ammonium hydroxide (TMAH) as the mixing medium which produced aluminium hydroxide Al(OH)3 in the form of white powders. The crystal structures, microstructures, and mapping of the atomic constituent of γ-Al2O3 and γ-Al2O3/SiO2 samples were respectively analyzed via X-ray diffraction (XRD), and scanning electron microscopy-energy dispersive X-ray SEM-EDX. At the calcination temperature to 300 °C, the samples still had boehmite phase, and the boehmite phase transformation to γ-alumina phase occurred at temperature of 700-900 °C. The γ-alumina phase began to form at the calcination temperature of 500-700 °C with the crystal structure of (440), (511), (400), (222), (311), and (111). The similar diffraction pattern was also shown by the γ-Al2O3/SiO2 composite for the calcination temperature of 700 °C and 900 °C. The microstructure analysis of the γ-Al2O3/SiO2 showed that SiO2 particles were smaller and round while the γ-Al2O3 particles were bigger and elongated. Additionally, the mapping results showed SiO2 and γ-Al2O3 particles were homogenously distributed. © Published under licence by IOP Publishing Ltd.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya, Kampus Ketintang, Jl. Ketintang, Surabaya, 60231, Indonesia; Research Center of Advanced Materials, Universitas Negeri Surabaya, Kampus Ketintang, Jl. Ketintang, Surabaya, 60231, Indonesia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang, 64145, Indonesia; Research Center of Minerals and Advanced Materials, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, Jl. Semarang 5, Malang, 64145, Indonesia
