多孔性陽極氧化鋁場流分離系統應用於奈米粒子之尺寸區分方法研究

Abstract

在本實驗中，我們以多孔性陽極氧化鋁(anodic aluminum oxide, AAO)發展了一套嶄新的場流分離(Field-Flow Fractionation)裝置。在實驗之前，我們先提出一個捕捉粒子的模型，接著設計一系列的實驗來測試與驗證這個模型。實驗的操作主軸分為兩個面向，即電場場流分離系統與磁場場流分離系統。其一，於電場場流分離系統實驗中，我們發現粒徑(10 nm)小於陽極氧化鋁孔洞的粒子在電場的影響下有被電解的趨勢，但這個現象在粒徑(40 nm)大於陽及氧化鋁孔洞的粒子中並不存在。然而氣泡的生成致使我們無法證明捕捉粒子的模型則為此電場場流分離裝置的致命傷。其二，在磁場場流分離系統實驗中，粒子捕捉的效果在陽極氧化鋁板與未處理的鋁板皆有，但陽極氧化鋁在數量上多於鋁板。接著在粒徑分析實驗中，被捕捉的粒子粒徑一般而言小於未被捕捉粒子的粒徑。雖然這僅是相當初期的研究，但陽極氧化鋁應用於場流分離系統所擁有的粒子大小選擇性，則是首度被驗證。

In the research, we developed a brand new Field-Flow Fractionation (FFF) device which based on porous anodic aluminum oxide (AAO) plate. After we issued a hypothesis of trap model, a series of experiments was designed to verify and testify the hypothesis. The line of the research separated into two different operations, the Electric Field-Flow Fractionation (ElFFF) and Magnetic Field-Flow Fractionation (MFFF). First, in the ElFFF experiment, a valuable result was found that a particle with a diameter (10 nm) smaller than the pores of AAO was prone to electrolysis under the electric field. While a particle had a diameter (40 nm) larger than AAO pores, such the tendency was not been found. However, the drawback of ElFFF, bubble formation, profoundly retarded us to verify the trap model in ElFFF. Second, in the MFFF experiment, the trap phenomenon was detected both in AAO plate and unprocessed Al plate, but the number of trapped particles in AAO plate was much more than Al plate. Furthermore, through the analysis of these trapped and non-trapped particles size, an exciting result indicated that the size of trapped particles was generally smaller than non-trapped particles. Although this was merely quite preliminary research, the size choosing ability of porous AAO first revealed in FFF instrument.