| Summary: | 碩士 === 明志科技大學 === 化學工程系碩士班 === 102 === This study prepared TiO2 dispersoids of TiO2 nanoparticles dispersed in ethanol. The effects of dispersants and dispersion equipment on the stability of the TiO2 dispersoids were investigated in this study. Several dispersants included oleic acid (OA), polyethylene glycol (PEG), Tween20, Tween80, Disperbyk190 (BYK190), Disperbyk420 (BYK420), and sodium dodecyl sulfate (SDS). Dispersion equipment included planetary ball mill, high pressure homogenizer, and wet ball mill. The experimental results showed that the TiO2 dispersoids with good stability were successfully prepared by adding 12% BYK190 dispersant and dispersing by wet ball mill for 6h. The mean particle sizes of 2 wt% TiO2 dispersoids were smaller than 50 nm and possessed long-term stability (up to six months).
The TiO2 dispersoids were applied as inorganic materials to prepare the acrylics/TiO2 nanoparticles hybrid optical thin films by mixing with high transparent acrylic polymer and using hydrolysis-condensation reaction process. The effects of the content of TiO2 in hybrid materials on the properties of hybrid films were also investigated. TGA and DSC analyses showed that the glass transition temperature (Tg) and thermal decomposition temperature (Td) increased with increasing the content of TiO2 in hybrid films. The refractive index of hybrid films measured by ellipsometer is in the range of 1.53 to 1.81 at wavelength 633 nm. UV-vis analyses indicated that the transmittance of hybrid films is higher than 85%. AFM analyses showed that the hybrid films have a good film forming property and surface planarity. According these results, the optical properties could be tunabled by adding the TiO2 in hybrid films and the hybrid films could be applied in optical thin films.
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