Nano grain size tungsten trioxide for thermal insulation film may be prepared by many different preparation methods. What are their advantages and disadvantages?
Tungsten trioxide with special morphology can be prepared using different preparation methods such as hydrothermal synthesis method, precipitation method, sol-gel method, microemulsion method, gas-liquid reaction method and template method. The advantages and disadvantages of these preparation methods are as follows: The WO3 powder prepared by hydrothermal synthesis method has the advantages of complete grain development, small particle size, uniform distribution and good dispersibility. The powder obtained by precipitation method tends to be complete with uniform particle size distribution and small particle size, but it is prone to agglomeration, which is not conducive to detection. The powder obtained by the sol-gel method has small particle size, good uniformity and high purity, and it is easy to be industrialized. While it is difficult to control the sol-gel transition, and the product is easy to form hard agglomeration after drying. The powder obtained by microemulsion method does not need to be heated with simple experimental device, convenient operation, controllable product composition and particle size, but it cost high with slight agglomeration. The powder obtained by gas-liquid reaction method has better safety performance, small size and good dispersibility, but the process is complicated and the production cycle is long. The template method is simple with high repetition rate, uniform shape and good predictability, but the template agent is relatively expensive.
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