Nanogibbsite: Synthesis and characterization

Nanogibbsite crystals synthesis and progression were analyzed by XRD and FTIR spectroscopy. TEM indicated the pseudo-hexagonal shape nanostructure. [Display omitted] . ► A simple methodology is presented to synthesize nanogibbsite particulates using supersaturated Al(OH) 3 solutions around pH 4.6. ►...

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Bibliographic Details
Published in:Journal of colloid and interface science 2010-12, Vol.352 (2), p.252-258
Main Authors: Kumara, C.K., Ng, W.J., Bandara, A., Weerasooriya, R.
Format: Article
Language:English
Subjects:
Aluminum base alloys
Aluminum Hydroxide - chemical synthesis
Aluminum Hydroxide - chemistry
Aluminum Oxide - chemical synthesis
Aluminum Oxide - chemistry
Bayer process
Chemistry
Chloride ions
Colloidal state and disperse state
Dialysis
Electron microscopy
Exact sciences and technology
General and physical chemistry
Gibbsite synthesis
IR spectroscopy
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Nanostructures - chemistry
Nucleation
Particle Size
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Surface Properties
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Summary:Nanogibbsite crystals synthesis and progression were analyzed by XRD and FTIR spectroscopy. TEM indicated the pseudo-hexagonal shape nanostructure. [Display omitted] . ► A simple methodology is presented to synthesize nanogibbsite particulates using supersaturated Al(OH) 3 solutions around pH 4.6. ► A plausible mechanism of nanogibbsite crystallization is proposed based on macroscopic and microscopic experimental data. ► Inhibiting role of chloride on nanogibbsite formation is discussed and further investigations are warranted. Nanogibbsite was synthesized using a supersaturated Al(OH) 3 solution which was prepared by titration of AlCl 3 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.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2010.08.083