The effects of chelating agent type on the morphology and phase evolutions of alumina nanostructures

Tabesh, Shiva; Davar, Fatemeh; Loghman-Estarki, Mohammad Reza

doi:10.1016/j.ceramint.2017.05.052

Cited by 15 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The other diffraction pattern in the γ-alumina phase showed the same trends; they were narrow compared with the pattern of the alumina before calcination due to the increase in the crystallinity of the alumina powder. The increase in calcination temperature led to a transformation from γ to α alumina [14,15]. The stable phase (corundum) appeared after calcination at 1200 °C.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of nano-alumina powder via recrystallization of ammonium alum

Saud¹,

Majdi²,

Saud

2019

Cerâmica

View full text Add to dashboard Cite

In the present study, a recrystallization method was implemented to recover alumina powder from ammonium alum crystal. The ammonium alum was completely dissolved in water and treated by ultra-sonication to prevent the agglomeration of the alum crystal. The white precipitate was dried at 150 °C for 6 h, and calcinations at different temperatures were performed for 2 h. The XRD results indicated the crystalline structure of alumina with two main phases: γ-Al2O3 and α-Al2O3 at 800 and 1200 °C, respectively. The N2 adsorption/desorption isotherm results indicated that the surface area for the powder in the γ phase, which can be applied in catalysts, was 142.5 m2/g, while, in the α-phase, it was 15.3 m2/g. The morphologies elucidated that the powder particles were widely distributed in the range of ≤160 nm at different calcination temperatures and this may be attributed to increments in the particle agglomeration as the calcination temperature increased.

show abstract

Section: Methodsmentioning

confidence: 99%

Synthesis of nano-alumina powder via recrystallization of ammonium alum

Saud¹,

Majdi²,

Saud

2019

Cerâmica

View full text Add to dashboard Cite

show abstract

“…To noted, the formic acid, oxalate acid, and citric acid contained one, two, and three carboxyl groups and are able to form dentate, bidentate, and tridentate, respectively. According to Wang et al [21], the stability of tridentate is better than bidentate and monodentate due to the better chelation formation for the stable metal complexes, which promote the crystal growth [22]. Therefore, the citric acid-treated powder had the largest crystallite among the three spray-dried YAG: Ce phosphor powders.…”

Section: Discussionmentioning

confidence: 97%

Preparation of Ce-doped yttrium aluminum garnet phosphor particles using spray drying method

Shih

Richardo

Sucipto

et al. 2020

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

“…Nanoparticles with a spherical shape, high purity, and homogeneity are created. 49 On the other hand, the formation of rod shape Ce-ZnO by the hydrothermal method began with nucleation from the precursor solution once the solution achieved supersaturation. 50 When the concentrations of Zn 2+ and À OH in the solution approach saturation, tiny ZnO nuclei form spontaneously in the solution follows eqn (3) and (4).…”

Section: Sem and Tem Imagesmentioning

confidence: 99%