Fabrication Ideally Ordered Filter Membranes Based on Electrochemical Selfordering Process

利用阳极多孔氧化铝的自组织过程制备了具有高度有序孔结构的过滤膜。[1]为了将阳极多孔氧化铝应用于过滤膜，研究了阳极多孔氧化铝中自然发生自有序的条件。阳极氧化时间和阳极氧化电压是影响多孔氧化铝孔结构长程有序化的主要因素。在阳极多孔氧化铝的孔结构的长程有序化过程中，通过孔结构的重排进行自有序化。[2]为了提高孔结构的有序性，提出了一种控制多孔氧化铝中孔阵列生长的新工艺。在此过程中，浅凹阵列形成的铝使用的模具，压痕，作为初始位置的理想安排的孔的配置在阳极氧化的初始阶段。通过改变预织构图案的间距和施加的电压，可以在60 ~ 500 nm范围内控制孔间距。[3]为了提高过滤膜的化学稳定性，采用有序多孔氧化铝作为起始结构，采用两步复制工艺制备金属孔阵列。在该过程中，负型阳极多孔氧化铝的制造和随后的正型阳极多孔氧化铝的形成产生了金属（Ni、Ag、Au）的孔阵列，其几何结构与起始阳极多孔氧化铝的几何结构相同。[4]考察了所得滤膜的微滤性能。使用高压进料系统检查高度有序的膜的流速。通过这些实验，可以证实膜的高流速和对小颗粒的高截留效率。

The filter membranes with highly ordered hole configuration were prepared based on the self-organizing process of anodic porous alumina. The obtained results are stmmarized as follows :[1] In order to apply the anodic porous alumina for filter membranes, conditions for naturally occurring self-ordering in anodic porous alumna were investigated. The conditions for the long-range ordering of the hole configuration of anodic porous alumina were dependent on anodization period and anodizing voltage. During the long-range ordering of the hole configurations of the anodic porous alumina, self-ordering proceeds through the rearrangement of the hole configuration.[2] To improve the ordering of the hole configuration, a novel process which can control the growth of the hole array in the anodic porous alumina, was introduced. In this process, an array of shallow concaves was formed on Al by indentation using a mold, which served as initiation sites for ideally arranged hole configuration in the initial stage of anodization. The hole interval could be controlled from 60 nm to 500 nm by changing the interval of the pretextured pattern and the applied voltage.[3] A two-step replication process using ordered anodic porous alumina as a starting structure was applied to prepare the metal hole arrays to improve the chemical stability of the filter membranes. In this process, the fabrication of negative-type anodic porous alumina and the subsequent formation of the positive type generates hole arrays of metals (Ni, Ag, Au) with a geomtrical structure identical to that of the starting anodic porous alumina.[4] The microfiltration properties of the obtained filter membranes were investigated. The flow rates of the highly ordered membranes were examined using high pressure feed systems. Through these experiment, high flow rates and the high entrapment efficiencies of the membranes for small particles could be confirmed.