Elaboration of boehmite nano-powders by spray-pyrolysis

• Published in: Powder technology Vol. 190; no. 1; pp. 95 - 98
• Main Authors: Caiut, J.M.A., Dexpert-Ghys, J., Kihn, Y., Vérelst, M., Dexpert, H., Ribeiro, S.J.L., Messaddeq, Y.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 05-03-2009; Elsevier
• Subjects: Alumina; Applied sciences; Boehmite; Chemical engineering; Exact sciences and technology; Miscellaneous; Nano-powders; Solid-solid systems; Sol–gel; Spray-pyrolysis; Boehmite; Sol–gel; Spray-pyrolysis; Alumina; Nano-powders; Pyrolysis; Sol-gel; Spherical particle; Powder; Surface treatment; Low temperature
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2008.04.054

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.
Boehmite (γ-AlOOH) have been synthesized using a spray pyrolysis (SP) device at
T
=
200 °C, from a stable sol of Al-tri-
sec-butoxide as precursor. The free spherical particles (100–500 nm in size), made of nano-crystalline boehmite, are spontaneously dispersible in water.
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