Cesium tungstate, or cesium tungsten bronze (Cs0.33WO3), can absorb the near-infrared rays and has thus been applied for preparing dingal film by activating surface plasmon effect of free electrons. And these transparent films are often used to the buildings or automobiles. According to the experts, Cs0.33WO3 powder can be prepared by high temperature carbothermal reduction method using tungstic acid and cesium carbonate as raw materials. In terms of grain size and purity, the raw materials are heat treated at 700 °C for 5 hours.
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Well, do you know how to turn coarse cesium tungstate powder into nano particle size cesium tungstate? Some experts use zirconia beads with a diameter of 50 microns for wet ball milling, thereby reducing the coarse Cs0.33WO3 powder to about 100 nm in 1 hour. And the prepared cesium tungstate can be used to prepare dingal films with the advantages of high heat insulation, high ultraviolet shielding, anti-glare and anti-peeping.
