Synthesize nanoparticles via reverse microemulsion

本研究以逆微乳膠沈澱技術製備分散良好的氧化鋯納米粒子。該逆微乳膠系統以CTAB 為界面活性劑，油 相為1-hexanol ，水相分別為硝酸氧鋯與氨水水溶液。首先分別配製硝酸氧鋯與氨水之逆微乳膠溶液，兩者混合 反應後形成含有氧化鋯先驅體的膠狀物，經過清洗、過濾等步驟並適當的熱處理後可得以正方晶相為主的氧化 鋯納米粒子。本研究首先進行小規模實驗，並探討影響氧化鋯納米粒子外觀與粒徑分佈的主要變數，例如含水 量、界面活性劑用量與氨水濃度等。粉體的外觀、粒徑分佈與聚集程度係以TEM 分析氧化鋯納米粒子的外觀與 粒徑分佈，並找出粒徑分佈良好與聚集程度最小的實驗條件，再進行放大實驗。在大實驗中以五升反應槽進行 實驗亦針對產量、產率與聚集程度作有系統的探討。Zirconia powder is synthesized via two reverse microemulsion. In this system, two solution of reverse microemulsion, one containing Zr 4+ aqueous droplets and the other aqueous ammonia droplets, with the same water/oil (W/O) ratio are prepared separately and mixed together to form a slurry of ZrO2 precursors. Then the precursors are retrieved and calcined to form tetragonal ZrO2. The preparation conditions that affect the morphology, degree of agglomeration and particle size are investigated, including water to oil ratio, water to surfactant ratio, and concentration of aqueous solution. Morphology and distribution of zirconia nanoparticles are examined by TEM, and then a set of operation conditions of better product quality was chosen for the large-scale experiment. In large-scale experiment, a five-liter reactor is applied to synthesize ZrO2 nanoparticles. The product, product yield and degree of agglomeration are investigated and compared with that of small-scale experiment