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Elaboration of boehmite nano-powders by spray-pyrolysis

✍ Scribed by J.M.A. Caiut; J. Dexpert-Ghys; Y. Kihn; M. Vérelst; H. Dexpert; S.J.L. Ribeiro; Y. Messaddeq

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
634 KB
Volume
190
Category
Article
ISSN
0032-5910

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✦ Synopsis

Boehmite (γ-AlOOH) synthesis have been investigated using a spray pyrolysis (SP) device starting from a stable sol of Al-tri-sec-butoxide peptized by nitric acid. Free spherical particles from 100 to 500 nm have been elaborated. Particles sub-structure is made of nano-crystalline boehmite with very small average crystallite size (one crystal cell along the b axis). The nano-crystalline boehmite synthesized by SP at low temperature (200 °C) is spontaneously dispersible in water without any surface treatment. Boehmite powder may be transformed to transition γ-alumina by heat post-treatment. Powders of sub-micrometric and spherical γ-alumina particles may also be synthesized by SP at 700 °C.

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