Synthesis of Cubic Alpha-Alumina Using a Blocking Reagent of Tetraethyl Ammonium Hydroxide
- Synthesis of Cubic Alpha-Alumina Using a Blocking Reagent of Tetraethyl Ammonium Hydroxide
- 강미숙; 김현수; 박노국; 이태진
- Issue Date
- AMER SCIENTIFIC PUBLISHERS
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.15, no.2, pp.1383 - 1388
- This study was an attempt to obtain a stable and reproducible cubic primary alumina by a hydrothermal method using various aluminum precursors, AIP, AlO(OH), and Al(OH)(3). Tetraethyl ammonium hydroxide was introduced as a blocking reagent to control the shape of alumina. The synthesized primary alumina powders from Al precursors showed a boehmite structure after hydrothermal treatment at 200 degrees C for 1 h. The primary alumina powders synthesized using the precursors of AIP and AlO(OH) had irregular shapes, however the cubic-shape of approximately 300 nm was observed in the primary alumina powder synthesized using Al(OH)(3) precursor. The cubic primary alumina samples were transformed to different solid phases like gamma-, delta-, theta-, and alpha-phases according to the calcined temperatures. The theta-phase alumina formed at 1100 degrees C continually kept the cubic shape, but the shape was collapsed at 1200 degrees C. However the cubic alpha-alumina was stably remained by thermal treatment at 1100 degrees C under the fierce oxygen atmosphere.
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