Roslyakov I V, Petukhov D I, Napolskii K S
Lomonosov Moscow State University, Moscow, Russia.
Kurnakov Institute of General and Inorganic Chemistry RAS, Moscow, Russia.
Nanotechnology. 2021 May 26;32(33). doi: 10.1088/1361-6528/abfeea.
Porous anodic aluminium oxide (AAO) membranes have various practical applications in separation and purification technologies. Numerous approaches have been utilized to tailor the transport properties of porous AAO films, but all of them assume an isotropic nature of anodized aluminium. Here, the impact of aluminium crystallography on the permeability of AAO membranes is disclosed. A comparative study of AAO membranes formed on low-index aluminium surfaces by anodizing in a sulphuric acid electrolyte is presented. Small-angle x-ray scattering is used to quantify the out-of-plane pore arrangement. AAO grown on an Al(100) substrate possesses a porous structure with minimal point defects and pore tortuosity, providing the highest permeability of individual gases in a series of AAO membranes. These findings can also be applied for the fabrication of highly permeable AAO membranes on polycrystalline Al foils.
多孔阳极氧化铝（AAO）膜在分离和纯化技术中有多种实际应用。人们已采用多种方法来调整多孔AAO膜的传输特性，但所有这些方法都假定阳极氧化铝具有各向同性。在此，揭示了铝晶体学对AAO膜渗透率的影响。本文介绍了在硫酸电解液中对低指数铝表面进行阳极氧化形成的AAO膜的对比研究。小角X射线散射用于量化面外孔排列。在Al(100)衬底上生长的AAO具有多孔结构，点缺陷和孔曲折度最小，在一系列AAO膜中提供了单个气体的最高渗透率。这些发现也可应用于在多晶铝箔上制备高渗透性AAO膜。
