Influence of Heat Treatment on the Optical Properties of Nanocomposites as Catalysts included Oxide Pigments

In this article , influence of heat treatment process with temperatures in the range of 400-1000 c on the optical properties of nanocomposites included oxide pigments has been reported. The studies carried out using X-ray diffraction XRD , diffuse reflectance spectrophotometry and colorimetric analysis L*a*b color parameters techniques. reflectance spectra were related to color using established international conventions according to the commission internationale d'Eclairage CIE method. the matrix network of the nanocomposites has provided an ultimate nucleation situation to regularly disperse nanoparticles and hence to imprison them to aggregate and harden which showed great effects on the crystallite size and optical properties of the nanocomposites included oxide pigments. particle sizes of the samples increased with the heat treatment temperatures. diffraction patterns confirmed the formation of a pure organic free single -phase oxide pigments with a FCC system. the color change is significantly in the chroma and lightness exes but hue angle of the nanocomposites is not changed by temperature. our results showed that in heat treatment temperatures below 800C by increasing the temperature the color of the sample shows considerable change.

کلیدواژه ها:

heat treatment ، nanocomposites ، oxide ، optical properties.