Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method

Hee Suk Roh, Geun Kyu Choi, Jae Sul An, Chin Moo Cho, Dong Hoe Kim, Ik Jae Park, Tae Hoon Noh, Dong-Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We demonstrated the formation of monodispersed spherical aluminum hydrous oxide precursors with tunable sizes by controlling the variables of a forced hydrolysis method. The particle sizes of aluminum hydrous oxide precursors were strongly dependent on the molar ratio of the Al 3+ reactants (sulfates and nitrates). In addition, the systematic phase and morphological evolutions from aluminum hydrous oxide to γ-alumina (Al 2O 3) and finally to α-Al 2O 3 through thermal dehydrogenation were characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). After annealing the amorphous aluminum hydrous oxide in air at 900°C and 1100 °C for 1 h, we observed complete conversion to phase-pure γ- and α-Al 2O 3, respectively, while maintaining monodispersity (125 nm, 195 nm, 320 nm, and 430 nm diameters were observed). Furthermore, both γ- and α-Al 2O 3 were found to be mesoporous in structure, providing enhanced specific surface areas of 102 and 76 m 2 g -1, respectively, based on the Brunauer-Emmett-Teller (BET) measurement.

Original languageEnglish
Pages (from-to)6901-6905
Number of pages5
JournalDalton Transactions
Volume40
Issue number26
DOIs
Publication statusPublished - 2011 Jul 14
Externally publishedYes

Fingerprint

Aluminum Oxide
Hydrolysis
Powder Diffraction
Dehydrogenation
Transmission Electron Microscopy
Particle Size
X-Ray Diffraction
Specific surface area
Field emission
Nitrates
Electron Scanning Microscopy
X ray powder diffraction
Sulfates
Hot Temperature
Particle size
Air
Annealing
Transmission electron microscopy
Scanning electron microscopy

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Roh, H. S., Kyu Choi, G., An, J. S., Moo Cho, C., Hoe Kim, D., Jae Park, I., ... Sun Hong, K. (2011). Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method. Dalton Transactions, 40(26), 6901-6905. https://doi.org/10.1039/c1dt10418g

Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method. / Roh, Hee Suk; Kyu Choi, Geun; An, Jae Sul; Moo Cho, Chin; Hoe Kim, Dong; Jae Park, Ik; Hoon Noh, Tae; Kim, Dong-Wan; Sun Hong, Kug.

In: Dalton Transactions, Vol. 40, No. 26, 14.07.2011, p. 6901-6905.

Research output: Contribution to journalArticle

Roh, HS, Kyu Choi, G, An, JS, Moo Cho, C, Hoe Kim, D, Jae Park, I, Hoon Noh, T, Kim, D-W & Sun Hong, K 2011, 'Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method', Dalton Transactions, vol. 40, no. 26, pp. 6901-6905. https://doi.org/10.1039/c1dt10418g
Roh, Hee Suk ; Kyu Choi, Geun ; An, Jae Sul ; Moo Cho, Chin ; Hoe Kim, Dong ; Jae Park, Ik ; Hoon Noh, Tae ; Kim, Dong-Wan ; Sun Hong, Kug. / Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method. In: Dalton Transactions. 2011 ; Vol. 40, No. 26. pp. 6901-6905.
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