Synthesis of alpha-Al2O3 at mild temperatures by controlling aluminum precursor, pH, and ethylenediamine chelating additive
- Synthesis of alpha-Al2O3 at mild temperatures by controlling aluminum precursor, pH, and ethylenediamine chelating additive
- 강미숙; 이준성; 김현수; 이준수; 박노국; 이태진
- ALPHA-ALUMINA; ELECTRICAL INSULATION; BOEHMITE; BEHAVIOR; PARTICLES; COATINGS; POWDERS
- Issue Date
- ELSEVIER SCI LTD
- CERAMICS INTERNATIONAL, v.38, no.8, pp.6685 - 6691
- This study demonstrates the synthesis of alpha-Al2O3 by sol-gel method according to various reaction parameters. Various Al2O3 phases were synthesized by a simple sol-gel method using three different aluminum precursors (aluminum isoporoxide (AIP), Al(OH)(3), and AlO(OH)) and pHs (3, 7, and 9). Thermally treating of the synthesized powders at 1200 degrees C produced rhombohedral structure alpha-Al2O3. When AIP was used as an aluminum precursor, alpha-Al2O3 was synthesized at all pH levels by calcination at 1200 degrees C. The structure was easily changed to alpha-Al2O3 by the addition of ethylenediamine as a chelating additive at the lower temperature of 1000 degrees C. In contrast, no alpha-Al2O3 structure was obtained by using Al(OH)(3) or AlO(OH) precursors at higher pH in spite of thermal treatment at 1200 degrees C. The specific surface areas were larger in alpha-Al2O3 synthesized using AIP precursor compared with that using Al(OH)(3) and AlO(OH) precursors. Electrophoretic light scattering (ELS) measurement in aqueous solution at pH = 7 revealed positive surface charges in the alpha-Al2O3 synthesized using AIP precursor, but negative charges in that synthesized using Al(OH)(3) and AlO(OH) precursors. Most significantly, the alpha-Al2O3 synthesized with the ethylenediamine chelating additive had a negative charge, despite the use of AIP precursor, with a higher mobility and larger aggregated particle diameter. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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