The
present study reports the preparation and characterization
of an orange nanopigment with high solar radiation reflective properties.
Complex Cr2O3–3TiO2 nanoparticles
were prepared by the pyrolysis of Cr–Ti precursors at high
temperature, and the effects of the calcination temperature on the
structure of Cr2O3–3TiO2 nanopigment
were investigated by thermal analysis, X-ray diffraction, and transmission
electron microscopy. The results reveal that the Cr2O–-3TiO2 pigments having rutile structure can be prepared by the calcination
of the precursor at above 600 °C. All Cr2O3–3TiO2 pigments are granular in nature and present
a homogeneous particle size of around 20 nm. The ultraviolet–visible
near infrared (UV–vis-NIR) reflection spectra show that the
Cr2O3–3TiO2 nanopigments have
a reflection peak at around 600 nm, which reflects the orange color
of these pigments. The average reflectance of Cr2O3–3TiO2 in the NIR range is around 53%, respectively,
which is much higher than that of the visible light range. The prepared
orange Cr2O3–3TiO2 nanopigments
have a great potential in applications such as cool materials used
for buildings with energy saving performance.
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