Nanogibbsite: Synthesis and characterization

C. K. Kumara; W. J. Ng; A. Bandara; R. Weerasooriya

doi:10.1016/j.jcis.2010.08.083

Nanogibbsite: Synthesis and characterization

C. K. Kumara, W. J. Ng, A. Bandara, R. Weerasooriya

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Nanogibbsite was synthesized using a supersaturated Al(OH)₃ solution which was prepared by titration of AlCl₃ with NaOH at pH 4.6. Excess chloride ions in the system were stripped off by dialyzing the Al(OH)₃ suspension against distilled water. The dialysis step is critical for initiation of gibbsite crystallization or the Al(OH)₃ suspension would remain amorphous. Chloride ions seem to mask the seeding sites and so retard the overall process of gibbsite formation. When subjected to heat treatment, gibbsite→alumina conversion occurred by two mechanisms. Nanogibbsite→α-alumina phase transition occurred forming χ- and κ-alumina polymorphs.

Original language	English
Pages (from-to)	252-258
Number of pages	7
Journal	Journal of Colloid and Interface Science
Volume	352
Issue number	2
DOIs	https://doi.org/10.1016/j.jcis.2010.08.083
State	Published - Dec 15 2010
Externally published	Yes

Keywords

Electron microscopy
Gibbsite synthesis
IR spectroscopy
Nanoparticles

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10.1016/j.jcis.2010.08.083

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abstract = "Nanogibbsite was synthesized using a supersaturated Al(OH)3 solution which was prepared by titration of AlCl3 with NaOH at pH 4.6. Excess chloride ions in the system were stripped off by dialyzing the Al(OH)3 suspension against distilled water. The dialysis step is critical for initiation of gibbsite crystallization or the Al(OH)3 suspension would remain amorphous. Chloride ions seem to mask the seeding sites and so retard the overall process of gibbsite formation. When subjected to heat treatment, gibbsite→alumina conversion occurred by two mechanisms. Nanogibbsite→α-alumina phase transition occurred forming χ- and κ-alumina polymorphs.",

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AU - Kumara, C. K.

AU - Ng, W. J.

AU - Bandara, A.

AU - Weerasooriya, R.

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Y1 - 2010/12/15

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AB - Nanogibbsite was synthesized using a supersaturated Al(OH)3 solution which was prepared by titration of AlCl3 with NaOH at pH 4.6. Excess chloride ions in the system were stripped off by dialyzing the Al(OH)3 suspension against distilled water. The dialysis step is critical for initiation of gibbsite crystallization or the Al(OH)3 suspension would remain amorphous. Chloride ions seem to mask the seeding sites and so retard the overall process of gibbsite formation. When subjected to heat treatment, gibbsite→alumina conversion occurred by two mechanisms. Nanogibbsite→α-alumina phase transition occurred forming χ- and κ-alumina polymorphs.

KW - Electron microscopy

KW - Gibbsite synthesis

KW - IR spectroscopy

KW - Nanoparticles

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Nanogibbsite: Synthesis and characterization

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