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High-surface-area corundum by mechanochemically induced phase transformation of boehmite

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Science  25 Oct 2019:
Vol. 366, Issue 6464, pp. 485-489
DOI: 10.1126/science.aaw9377

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Milling corundum nanoparticles

High-purity corundum (α-Al2O3) nanoparticles could enable applications such as more stable catalyst supports or precursors for high-strength ceramics. Milling of corundum only produces micrometer-scale particles, and direct synthesis from other aluminum oxides that would be likely starting materials, such as γ-Al2O3, fails because of the high activation barrier for converting the lattice structure of these cubic close-packed oxides. Amrute et al. show that ball milling of boehmite, γ-AlOOH, created ∼13-nanometer-diameter corundum nanoparticles of high purity through a mechanically induced dehydration reaction and by the effect of milling impacts on the surface energy of the particles.

Science, this issue p. 485

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