Cs0.32WO3 is a popular near-infrared shielding material for producing transparent heat insulating glass. You know, the Cs0.32WO3 powder should be at the nanoscale. According to the experts, the variation of mean hydrodynamic diameter of Cs0.32WO3 powder with grinding time. They said that the mean hydrodynamic diameter of Cs0.32WO3 powder can be decreased quickly from about 1,310 nm to about 50 nm within 3 h, in accordance with the results of their experiment. And the result revealed that the size of Cs0.32WO3 powder could be reduced to nanoscale efficiently by the bead milling process.
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Also, the hydrodynamic diameter distributions of Cs0.32WO3 powder after grinding for 1, 2, and 3 h revealed that increasing the grinding time not only led to the decrease of hydrodynamic diameters, but also made the hydrodynamic diameter distribution become narrower, said the experts. 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, the aqueous dispersions of Cs0.32WO3 powder before and after grinding for 3 h were observed clearly to find that the aqueous dispersion of Cs0.32WO3 powder before grinding was quite unstable. They precipitated completely in a few minutes. However, after grinding for 3 h, a homogeneous and stable aqueous dispersion of Cs0.32WO3 nanoparticles with a mean hydrodynamic diameter of 50 nm could be obtained.
