Study on the preparation and measurement of properties of oil-base magnetic fluids 洪榮駿、洪振義
E-mail: [email protected]
ABSTRACT
Magnetic fluid is a suspension of nano-sized magnetic particles which coated surfactant, dispersed in carrier such as water or organic solvents.When magnetic field is applied to magnetic fluid, the magnetic particles along with carrier will move in the direction of magnetic field. Therefore magnetic fluid is the suspension solution holding properties of magnetism and fluid. In this research, the preparation of nanometer Fe3O4 particles by co-precipitation method used concentrated ammonia water as alkaline fluid. Powder X-ray diffraction (XRD) is used to identification crystal structure of Fe3O4, and vibration sample magnometer (VSM) is used to verify superparamagnetism of Fe3O4 particles. The low-volatility oils are selected to prepare high quality magnetic fluids as surfactant and carrier. The optimal conditions of synthesis such as reaction temperature and time, proportion of ingredients, and other parameters were determined. The stability of magnetic fluid was tested by TGA and volatility test. Also magnetic fluid was applied to magnetic fluid seal to pressure resistance. Key Words: Magnetic fluid, co-precipitation method, Fe3O4 particles, low-volatility oils, magnetic fluid seal.
Keywords : Magnetic fluid ; co-precipitation method ; Fe3O4 particles ; low-volatility oils ; magnetic fluid seal Table of Contents
封面內頁 簽名頁 授權書 iii 中文摘要 iv 英文摘要 v 誌謝 vi 目錄 vii 圖目錄 ix 表目錄 xi 符號說明 xii 第一章 緒論 1.1 磁性流體原理 1 1.2 磁性流體研 究史 2 1.3 研究動機與目的 3 第二章 磁性流體製程與實驗 方法 2.1 磁性流體製程設備 5 2.2 Fe3O4奈米磁性粒子製備 7 2.2.1 使 用NaOH合成Fe3O4粒子 7 2.2.2 使用NH3,aq合成Fe3O4粒子 8 2.3 使用分散劑製備油基磁 性流體 8 2.4 氟油基磁性流體製程 12 2.5 磁性流體特性量測設備 15 2.5.1 XRD粉末X光繞射儀 15 2.5.2 VSM振動樣品磁化儀 15 2.5.3 粒徑分析儀 16 2.5.4 TGA熱重分析儀 17 2.5.5 磁性流體微 結構觀察 17 2.6 磁性流體軸封原理與實驗方法 19 2.6.1 傳統軸封原理 19 2.6.2 磁性流體軸封原理 20 2.6.3 磁性流體軸封實驗設備 21 第三章 結果與討論 3.1 奈米磁性粒子製備方式比較 23 3.2 使用分散劑製備磁性流體之實驗結果 26 3.3 氟油基磁性流體製程之實驗結果 28 3.3.1 適當的Fe3O4粒子用量 28 3.3.2介面活性劑用量 29 3.3.3披覆介面活性劑之溫度與時間 31 3.4 氟油基磁性流 體性質 36 3.4.1 微結構觀察 36 3.4.2 粒徑分析 41 3.4.3 溫度試驗 45 3.5 磁性流體軸封密封耐壓測試 51 第四章 結論 54
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