Investigation on surface radiative properties of porous thermochromic materials

We have successfully prepared bulk and porous perovskite-type manganese thermochromic materials by using solid-state reaction method and colloidal crystal template method, respectively. The effects of preparation methods on Curie temperature, and doping ratio, surface roughness and surface microstructure on radiative properties of the materials are discussed. The results suggest that, the Curie temperatures of the materials with different structures are obviously different from each other, but the emissivity both increases with the increase of temperature. And above room temperature, the emissivity of porous materials is remarkably higher than the bulk ones. Meanwhile, the surface roughness has a great impact on radiative properties of the materials.