管状阳极氧化铝模板的表面氧化应力分析及其应用研究

Investigation on the stress during the surface oxidation of tubular anodic aluminum oxide membranes and their application

通过对高纯铝片预制铝管分别进行"外表面阳极氧化"(外氧化)和"内表面阳极氧化"(内氧化)制备了管状多孔氧化铝模板(AAO),考察了氧化过程中Al/Al2O3界面的应力影响。实验直观表明,"外氧化"过程中Al/Al2O3界面产生拉伸应力易导致管状模板产生轴向裂纹;而"内氧化"过程中Al/Al2O3界面产生压缩应力使管状模板更加紧密而不易破裂。研究结果表明,Al/Al2O3界面上拉伸应力的有效释放是获得无裂纹管状阳极氧化铝模板的关键。最后,利用管状氧化铝模板制备了放射状Cu纳米线阵列,并对其在膜渗透方面的应用进行了初步尝试。

Tubular anodic aluminum oxide （AAO） membranes were fabricated using the ＂external anodizing＂ and “internal anodizing” methods （i. e. , anodic oxidation takes place from the outside or from the inside of an aluminum tube）, respectively. The effect of stress at the aluminum/alumina interface on tubular membrane was investigated. The results evidently show that the inwardly expanding alumina layer creates tensile stress at aluminum/alumina interface in the “external anodizing” configuration, which facilitates the crack propagation. On the contrary, a compression stress created at aluminum/alumina interface in the “internal anodizing” config uration keeps the membrane compact. Relaxation of the stress at the aluminum/alumina interface was verified to be crucial for obtaining crack-free tubular AAO membranes. At last, the application of tubular AAO mem branes on fabricating nanowires and filtration were effectively attempted.