Publicação: Elaboration of boehmite nano-powders by spray-pyrolysis
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Elsevier B.V. Sa
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Boehmite (gamma-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 degrees C) is spontaneously dispersible in water without any surface treatment. Boehmite powder may be transformed to transition gamma-alumina by heat post-treatment. Powders of sub-micrometric and spherical gamma-alumina particles may also be synthesized by SP at 700 degrees C. (C) 2008 Elsevier B.V. All rights reserved.
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Spray-pyrolysis, Nano-powders, Boehmite, Alumina, Sol-gel
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Inglês
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Powder Technology. Lausanne: Elsevier B.V. Sa, v. 190, n. 1-2, p. 95-98, 2009.
