| Summary: | 碩士 === 國立雲林科技大學 === 化學工程與材料工程系 === 102 === High purity aluminum hydroxide (Al(OH)3) was prepared by sol-gel method, and high purity aluminum isopropyl alcohol was synthesized by aluminum (5N) and isopropyl alcohol. Adjusting the pH level and water volume in the sol-gel method significantly affected the reaction process. From the results of SEM, EDS, IR and XRD, uniform Al(OH)3gel particle size was produced at conditions pH=2 and mole ratio (between water and aluminum isopropyl alcohol) R=7. With increase H+ ion concentration at pH=2, the rate of condensation increased which created a stable regime with extended gel time resulting in smaller particle size.Water volume also played an important role in the reaction process. When water volume was decreased slow reaction occurred toward products, and forming larger particles from shorten gel time. While increasing the water volume speeded up the reaction process and completed the reaction with water, which ultimately produced smaller size particles.
The sol-gel synthesis of Al2O3was done by hydrolysis and polycondensation of alcoholysized metal alkoxide, and followed by calcination.We examinedthe crystal structure of Al2O3at various calcination temperatures utilizing SEM, EDS and XRD techniques. Results have shown that good crystallinity can be obtained bycalciningat 1200oC for 2 hrs. Also, the addition of carbon powder promoted the formation of porous structure. By adding 5 mg of silver nitrate (AgNO3),Al2O3 ceramic can be 99.9% antibacterial at released Ag+ concentration of 0.17ppm.
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