Nano cesium tungsten bronze, or Cs0.33WO3 nanopowder, may be applied for producing transparent thermal insulation nanopowder. To be precise, the cesium tungsten bronze nanopowder is a dark blue nanopowder that can be used to prepare transparent heat insulation materials such as glass transparent heat-insulation coatings. It is reported that Cs0.33WO3 nanoparticles has the commonality of nano materials, such as, small size effect.
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So what is small size effect? When the nanoparticle size is equal to or smaller than the wavelength of the light wave, the de Broglie wavelength of the conduction electron and the coherence length and transmission depth of the superconducting state, its periodic boundary is destroyed. The atomic density near the amorphous surface layer of the nanoparticle is reduced, so that the acoustic, optical, electrical, magnetic, and thermodynamic properties are changed. For example, when copper particles reach nanometer size, they become electrically non-conductive, and the insulating silica particles start to conduct electricity at 20nm.
