- 學位論文
四氧化三鐵磁性微粒製備之研究
A Study on the Preparation of Micro-magnetic Particles Fe3O4
摘要
具有磁性的金屬氧化物粒子，如三氧化二鐵、四氧化三鐵粒子等。現今常被利用於磁性記憶材料、核磁共振造影、藥物傳遞、生化物質的分離、感測等技術上。 本實驗利用化學共沉澱法製備Fe3O4微粒，以FeCl3及FeCl2．4H2O作為前驅物，分別提供Fe(III)及Fe(II)離子參與反應。利用不同比例的Fe(III)和Fe(II)離子相混合，並以氫氧化鈉催化共沉澱形成Fe3O4粒子。以甘胺酸(Glycine)或PEG20000作為保護劑，提供Fe3O4粒子較佳的穩定性均勻分散於水溶液中。 實驗中主要探討不同比例的Fe(III)及Fe(II)離子混合所生成Fe3O4粒子其產率及純度的變化藉以找出最佳的混合比。接著探討加入保護劑如PEG20000或甘胺酸(Glycine)對於Fe3O4粒子的粒徑大小之影響。實驗樣品利用原子吸收光譜儀（AA）分析溶液中離子濃度、X光繞射光譜儀（XRD）分析樣品成分、動態光散射儀（DLS）等儀器分析粒子之粒徑分布、磁性與穩定度。 最後可以發現Fe(II)和Fe(III)離子在1：3、2：3這二個條件下的Fe3O4產量及純度最為理想。
並列摘要
Magnetically active particles such as Fe2O3 and Fe3O4 have been extensively investigated. Recently their application focus on the technique of magnetic memory material imaging, drug delivery, seperation of biological materials and sensor. In this experiment we prepared micro-particle of Fe3O4 by using chemical precipitation. FeCl3 and FeCl2．4H2O are the corresponding precursors to provide Fe(III) and Fe(II) ions for this reaction respectively. We used different ratio of precursors and used NaOH to participate in the reaction, then the Fe3O4 particles had been synthesized. Fe3O4 particles can be dispersed in aqueous solution and will be more stably with added Protectants, such as PEG20000 and glycine. In this research we discuss on the yield and purity of Fe3O4 particles which were depend on the reaction with different ratio of the Fe(III) and Fe(II) ions. Finally we can find out the best ratio of Fe(III) and Fe(II) ions in this synthetize. Then we discuss on the relation with Protectants as PEG20000 or glycine and the particles size of Fe3O4. The metal ions concentration,the composition of material and particle size can characterized by AA,XRD and DLS etc respectively. Finally the best ratio of Fe(II) and Fe(III) ions in this synthetize are 1：3 and 2：3。