Ivas, Toni ; Balaban, Milica ; Dosen, Vedrana ; Miyawaki, Jin ; Ito, Kazuki ; Vrankovic, Dragoljub ; Ostojic, Gordana ; Zeljkovic, Sasa (2019)
Optimization of the calcination temperature for the solvent-deficient synthesis of nanocrystalline gamma-alumina.
In: Chemical papers, 73 (4)
doi: 10.1007/s11696-018-0637-x
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Ivas, Toni ; Balaban, Milica ; Dosen, Vedrana ; Miyawaki, Jin ; Ito, Kazuki ; Vrankovic, Dragoljub ; Ostojic, Gordana ; Zeljkovic, Sasa |
| Art des Eintrags: | Bibliographie |
| Titel: | Optimization of the calcination temperature for the solvent-deficient synthesis of nanocrystalline gamma-alumina |
| Sprache: | Englisch |
| Publikationsjahr: | April 2019 |
| Verlag: | Springer International Publishing AG |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Chemical papers |
| Jahrgang/Volume einer Zeitschrift: | 73 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1007/s11696-018-0637-x |
| URL / URN: | https://link.springer.com/article/10.1007%2Fs11696-018-0637-... |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | Al2O3; Solvent-free method; Phase transformation; Densification GAMMA-AL2O3 NANOPARTICLES; CRYSTALLITE SIZE; PHASE; TRANSITION; BOEHMITE |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 28 Jun 2019 07:02 |
| Letzte Änderung: | 28 Jun 2019 07:02 |
| PPN: | |
| Projekte: | Ministry of Science and Technology of Republic of Srpska, Grant Number 19/6-020/961-49/12 |
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