Cesium tungsten bronze nanopowder for producing exhibition hall thermal insulating glass coating can be obtained by grinding the coarse cesium tungsten bronze powder. The experts found the results of the variation of mean hydrodynamic diameter of Cs0.33WO3 powder with grinding time.
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The mean hydrodynamic diameter of Cs0.33WO3 powder decreased quickly from about 1,310 nm to about 50 nm within 3 h, revealing that the size of Cs0.33WO3 powder could be reduced to nanoscale efficiently by the bead milling process. The experts also introduced the hydrodynamic diameter distributions of Cs0.33WO3 powder after grinding for 1, 2, and 3 h. The results showed that increasing the grinding time not only led to the decrease of hydrodynamic diameters, but also made the hydrodynamic diameter distribution become narrower. This could be reasonably referred to the fact that a longer grinding time could provide more contact between the grinding beads and the ground powder. In addition, experts explained that the photographs for the aqueous dispersions of Cs0.33WO3 powder before and after grinding for 3 h. The aqueous dispersion of Cs0.33WO3 powder before grinding was quite unstable, which precipitated completely in a few minutes. However, after grinding for 3 h, a homogeneous and stable aqueous dispersion of Cs0.33WO3 nanoparticles with a mean hydrodynamic diameter of 50 nm could be obtained.
