Nano cesium doped tungsten oxide may be used to produce infrared thermal insulation nano material, which is widely applied in the fields of construction and automobile glass due to its excellent thermal insulation performance and environmental protection performance. Therefore, experts are also more committed to the preparation of the raw material, in order to obtain a higher quality amount of cesium doped tungsten oxide nano powder at a lower cost and shorter cycle.
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The following is a preparation method of cesium doped tungsten oxide powder, which has a certain cost advantage and a short reaction cycle. The preparation of the cesium doped tungsten oxide powder mainly includes the following steps:
1.0 According to the Cs/W molar ratio 1:(1.5-2.8), weigh ammonium metatungstate and cesium nitrate, add EDTA and propylene glycol, react at 170°C for 3h; wherein the molar ratio of EDTA to cesium ions is (3-7):1; propylene glycol is used in an amount such that the molar concentration of cesium hydroxide reaches 0.1-0.4mol/L; in addition, ammonium metatungstate contains NH4+, which not only provides a tungsten source, but also produces ammonia gas at a high temperature reaction. The atmosphere protects the color stability, and the obtained cesium doped tungsten oxide powder is dark blue; and propylene glycol acts not only as a reaction medium but also disperses the powder obtained by the reaction, so that the obtained powder has a small particle size.
2.0 The mixture obtained in step 1.0 is charged into a pressure-capacity bomb, and reacted at 260-270°C for 5-8h.
3.0 The reactant obtained in the step 2.0 was subjected to alcohol washing, centrifugation, and vacuum drying at 80°C to obtain the cesium doped tungsten oxide powder.
