Tungsten trioxide may be applied for producing building thermal insulating glass. And it is WO3 nanorods that are generally used in the production of heat insulating glass. According to experts, it is of importance to study the small size effect of tungsten trioxide nanomaterials for the electrochromic properties of electrochromic devices such as heat-insulating glass as the characteristics of nanomaterials are largely influenced by their size.
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So what is the small size effect? When the size of the particle is equivalent to or smaller than the physical characteristic size such as wavelength of light wave, wavelength of De Broglie, and coherence length superconducting state or transmission depth, the periodic boundary conditions of the crystal will be destroyed. And atomic density near the surface of the particles of amorphous nanoparticle layer decrease, leading to changes in acoustic, optical, electrical, magnetic, thermal, and mechanical properties to exhibit new physical properties. This process is known as small size effects.
