5/2/2013· Cs WO 3 nanoparticles have been prepared successfully by a stirred bead milling process. By grinding microsized coarse powder with grinding beads of 50 μm in diameter, the mean hydrodynamic diameter of Cs WO 3 powder could be reduced to about 50 nm in 3 h, and a stable aqueous dispersion could be obtained at pH 8 via electrostatic repulsion mechanism.