Preparation of ultrafine dispersions of zinc oxide by ...
After 6 h of wet ballmilling, 19% of the particles were in the ultrafine range and 45% of the particles were in the coarser range in the case of the zinc oxide dispersion containing 3 wt.% PCA . After 30 h of ballmilling the quantity of ultrafine particles decreased to 6% whereas the quantity of coarser particles increased to 74%.