| Popis: |
In this work, we describe the synthesis and infrared light reflecting characteristics of TiO 2 /mica hybrid composites. TiO 2 /mica composite materials were obtained by the hydrolysis and condensation reaction of titanium isopropoxide in an aqueous sol-ution of acetic acid in the presence of mica particles. Amorphous phase of TiO 2 on the surface of mica was converted to the crystalline rutile phase via anatase phase by heat treatment (600-1000 ℃, 1-3 h) of TiO 2 /mica composite materials, and the size of crystals was controlled by heat treatment conditions. Physicochemical properties of mica and TiO 2 /mica composites were investigated using FE-SEM, ED-XRF, and PXRD. The solar reflectance of TiO 2 /mica composites in the near IR region (780∼2,500 nm) measured using a diffuse reflectance NIR spectrophotometer was 88.6%, which is rather higher than that of calcined pure mica (86.6%). Therefore, TiO 2 /mica composites can be used as NIR light reflective pigments. Keywords: titanium dioxide, mica, light reflecting material, composite, paint pigment |
