Abstract
The grinding and aggregation behavior of MoO3 , WO3 , and α-Al2O3powders in ball mills (specific power from 10 to 100 W/g) was studied. Is was shown using optical-beating measurements that the smallest particle size attainable by mechanical processing is ∼7 nm. The powders prepared by dry grinding contained no more than 5 wt % of 10-nm particles. According to particle-size analysis, after 30 s of grinding, the particles aggregated. The separation of 10-nm particles from the suspension was found to be accompanied by an increase in average particle size to 32 nm. Under the assumption that the instability of fine (5–50 nm) metal-oxide particles is caused by surface hydroxyls, a procedure was elaborated by which α-Al2O3powders containing ∼50 wt % of 20-nm particles can be prepared.
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Poluboyarov, V.A., Korotaeva, Z.A. & Andryushkova, O.A. Preparation of Ultrafine Particles by Mechanical Processing. Inorganic Materials 37, 496–499 (2001). https://doi.org/10.1023/A:1017585018929
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DOI: https://doi.org/10.1023/A:1017585018929