Nano Grain Size Cesium Tungsten Oxide Applied for Thermal Insulation Paper

Nano grain size cesium tungsten oxide, or nano cesium tungsten bronze, may be applied for preparing a functional thermal insulation paper. The obtained heat-insulating thin paper is actually a transparent heat-insulation film, which can shield near-infrared rays (of high heat insulation performance) and ultraviolet rays (of high UV resistance). And such transparent film does not affect visible light transmission, so it may be applied to fields such as architectural glass windows.

Experts said that the raw material cesium-doped tungsten oxide nanopowder, i.e., cesium tungsten bronze nanopowder, cannot be agglomerated. In other words, it needs to have good dispersibility. So, what should be done with the agglomerated nanoparticles?

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The agglomerated nanoparticles can be processed by a ball milling process. There are many factors influencing the dispersion of nanoparticles by the ball milling process. The proper ball milling time can effectively open the agglomerated nanoparticles. When the ball milling time is too long, the particles will expose the active surface, and the heat generated by long-time ball milling will also make the nanoparticles unstable, and thus secondary agglomeration occurs. The mass of the grinding ball and the mass ratio of the dispersion are also an important factor affecting the dispersion effect. The fixed ball milling volume, although a large number of grinding balls are beneficial to increase the collision probability of the grinding balls and the agglomerated particles, excessive grinding balls will cause the grinding balls to move. The space becomes smaller, which reduces the impact of the grinding ball and the agglomerated particles. In addition, the rotational speed of ball mill, the size of grinding ball, the material of ball mill and the grinding ball have a certain influence on the dispersion effect of nanoparticles.

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