| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 102 === In this thesis, the selectivity for the dispersant of a commercial nano-titania (nano-TiO2) overlaid with silane was studied. Several types of dispersants with the only difference in their functional groups, including oleic acid (OA), oleyl alcohol (OL), oleyl amine (OLA) and oleyl phosphate (OP), were chosen and introduced to the organic-based suspensions of nano-TiO2 to investigate and compare their providing steric and the electrostatic repulsions. In the experiments, the surface chemistries of nano-TiO2 were identified by using the techniques of Fourier-transferred infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and the zeta-potentials, and the interactions between nano-TiO2 and the different dispersants and also the resulted dispersion properties of the as-prepared suspensions were assessed by analyzing the rheologies. In addition, the possible dispersion mechanisms of these dispersants for nano-TiO2 were proposed and being verified through the theoretical calculations on the potential energies caused by the addition of dispersants.
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