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Optimization of the calcination temperature for the solvent-deficient synthesis of nanocrystalline gamma-alumina

Ivas, Toni and Balaban, Milica and Dosen, Vedrana and Miyawaki, Jin and Ito, Kazuki and Vrankovic, Dragoljub and Ostojic, Gordana and Zeljkovic, Sasa (2019):
Optimization of the calcination temperature for the solvent-deficient synthesis of nanocrystalline gamma-alumina.
In: Chemical papers, Springer International Publishing AG, pp. 901-907, 73, (4), ISSN 2585-7290,
DOI: 10.1007/s11696-018-0637-x,
[Online-Edition: https://link.springer.com/article/10.1007%2Fs11696-018-0637-...],
[Article]

Abstract

Nano-sized alumina is prepared using a cost-effective solvent-free method with aluminum nitrate and ammonium bicarbonate precursors. Combined investigations by thermal analysis (TG/DTA), X-ray diffraction (XRD), specific surface area (BET), scanning electronic microscopy (SEM), infrared emission spectroscopy (FTIR), dynamic light scattering (DLS) and dilatometry were used to examine the effects of calcination temperature on the formation of Al2O3. XRD analysis shows that the -Al2O3 phase forms already at 300 degrees C and slowly continues to form with increasing temperature indicating a diffusion-controlled reaction as shown by FTIR. The size of the -Al2O3 nanocrystalline, as determined by XRD, is between 1.5 and 1.9nm and slowly increased with the reaction temperature. DLS results revealed that a particle size of -Al2O3 dispersed in water grows with increasing reaction temperature due to nanocrystalline particle aggregation, which was additionally confirmed by SEM. The densification behavior of the boehmite and -Al2O3 phases was investigated using dilatometry.

Item Type: Article
Erschienen: 2019
Creators: Ivas, Toni and Balaban, Milica and Dosen, Vedrana and Miyawaki, Jin and Ito, Kazuki and Vrankovic, Dragoljub and Ostojic, Gordana and Zeljkovic, Sasa
Title: Optimization of the calcination temperature for the solvent-deficient synthesis of nanocrystalline gamma-alumina
Language: English
Abstract:

Nano-sized alumina is prepared using a cost-effective solvent-free method with aluminum nitrate and ammonium bicarbonate precursors. Combined investigations by thermal analysis (TG/DTA), X-ray diffraction (XRD), specific surface area (BET), scanning electronic microscopy (SEM), infrared emission spectroscopy (FTIR), dynamic light scattering (DLS) and dilatometry were used to examine the effects of calcination temperature on the formation of Al2O3. XRD analysis shows that the -Al2O3 phase forms already at 300 degrees C and slowly continues to form with increasing temperature indicating a diffusion-controlled reaction as shown by FTIR. The size of the -Al2O3 nanocrystalline, as determined by XRD, is between 1.5 and 1.9nm and slowly increased with the reaction temperature. DLS results revealed that a particle size of -Al2O3 dispersed in water grows with increasing reaction temperature due to nanocrystalline particle aggregation, which was additionally confirmed by SEM. The densification behavior of the boehmite and -Al2O3 phases was investigated using dilatometry.

Journal or Publication Title: Chemical papers
Volume: 73
Number: 4
Publisher: Springer International Publishing AG
Uncontrolled Keywords: Al2O3; Solvent-free method; Phase transformation; Densification GAMMA-AL2O3 NANOPARTICLES; CRYSTALLITE SIZE; PHASE; TRANSITION; BOEHMITE
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 28 Jun 2019 07:02
DOI: 10.1007/s11696-018-0637-x
Official URL: https://link.springer.com/article/10.1007%2Fs11696-018-0637-...
Projects: Ministry of Science and Technology of Republic of Srpska, Grant Number 19/6-020/961-49/12
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