| Summary: | 碩士 === 國立中興大學 === 材料工程學研究所 === 92 === Nano-scale zinc oxide is a multi-functional material, and has attracted much attention in recent years. In this research, dispersion and rheological behavior of zinc oxide nanoparticle suspensions were examined. In addition, zinc oxide particles were synthesized by a sol-gel method and their properties characterized.
First, in the aspect of dispersion behavior of nanoparticles in pure water, mixing of commercially available nano-scale zinc oxide particles with four different organic polymer dispersants : DP-18, 910, 912 and 1040S, was conducted. The most effective surfactant was determined through viscosity testing of the nanoparticle suspensions. Rheological behavior of the suspensions was then examined over a range of solid concentration and shear-rate range. A maximum solid concentration of suspension was then determined and the agglomerated suspension microstructure was analysed using fractal geometry.
Second, properties of sol-gel derived zinc oxide powders were conducted. A precursor material of zinc acetate was first added in dehydrated isopropyl alcohol. Diethanolamine (DEA) was then added and the solution was agitatively mixed to form solutions with Zn2+. The mixtures were then dried and gelled by heat treatment. By varying two process parameters, i.e., temperature and heating time, zinc oxide powders were synthesized and their property and microstructure were analysed by x-ray diffractometry(XRD), fourier-transform infrared spectrometry(FT-IR), differential scanning calorimetry(DSC) and field-emission scanning electron microscopy(FE-SEM).
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