Nano particle size cesium tungsten oxide, or cesium tungsten bronze nanoparticles or Cs0.33WO3 nanoparticles, may be used for preparing nano-ceramic dispersion solution. And the obtained dispersion solution is a dingal dispersion solution with excellent heat insulation effect so that it may be used for preparation of heat-insulation film, and thus be applied to architectural glass.
The Cs0.33WO3 dispersion solution is ball milled. Some experts observed the absorbance of the supernatant of ball-milled Cs0.33WO3 dispersion solution adding with different dispersing agents after centrifugation. It was found that the dispersion stability of Cs0.33WO3 dispersion solution with PVA and titanate coupling agent was higher than that of polycarboxylate dispersant.
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The dispersant maintains the dispersion performance and stability of the Cs0.33WO3 dispersion solution by steric hindrance. PVA has a large amount of hydroxyl groups. When a large amount of hydroxyl groups are adsorbed on the surface of Cs0.33WO3 particles, the wetting and dispersing properties of Cs0.33WO3 can be improved. Similarly, the titanate coupling agent has a large amount of alkoxy groups, which can react with the surface hydroxyl groups of Cs0.33WO3 to form an active monolayer coated on the surface of the nanoparticles, which improves the dispersion stability of Cs0.33WO3 to some extent. However, the polycarboxylate dispersant belongs to the anionic surfactant. When a large amount of anions are adsorbed on the surface of the Cs0.33WO3 particles, the electric double layer on the surface of particle is crushed to destroy the stable electric double layer structure, thereby destroying the dispersion stability of Cs0.33WO3 dispersion solution.
