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Paper
New J. Chem., 2009, 33, 2255 - 2260, DOI: 10.1039/b9nj00351g
Preparation of
-Al2O3 film by high temperature transformation of nanosized -AlOOH precursorsYannick Mathieu, Loïc Vidal, Valentin Valtchev and Bénédicte Lebeau
Mesoporous boehmite (
-AlOOH) and gamma-alumina (-Al2O3) self-supported films were prepared by high temperature transformation of -AlOOH precursor fibers. A polymer, sodium polyacrylate, was used as a size/morphology controlling agent yielding to a stable colloidal suspension of boehmite ribbon-like fibers after a 168 h hydrothermal treatment at 160 °C. The slow evaporation of the solvent leads to -AlOOH film without any cracks and pinholes. The -Al2O3 film, obtained after calcination of the -AlOOH film, exhibit a high thermal stability up to 1000 °C and two distinct kinds of mesopores with average diameters of 20–30 
and 50 . Structural and textural properties of these films confer them interesting properties for filtration processes.
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