Barium titanate dispersion obtained by a high pressure methods and light resistant composites containing the nanoparticles

摘要

To improve the light resistance of the organic–inorganic composite for optical use, barium titanate (BTO) dispersion was prepared instead of titanate (TiO₂) dispersion by a high pressure reaction between titanium oxide (TiO₂) dispersions treated with silane-coupling reagent and barium hydroxide [Ba(OH)₂]. The obtained BTO was observed by transmission electron microscope (TEM) and its diameter was less than 10 nm. This seemed the result from the treatment of the TiO₂ before the reaction. In addition, X-ray diffraction analysis (XRD) indicated TiO₂ crystals didn’t remain in the BTO. Transparent composites composed of 2-hydroxy-butylacrylate as the organic matrix and the BTO or the TiO₂ as the inorganic filler were prepared. The composite including the BTO showed much longer decomposition time than that of TiO₂ in the light (405 nm) resistance test. This indicates that the BTO has lower photocatalytic activity than the TiO₂.