Yang Yan, Xu Dawei, Liu Qianqian, Wang Qi, Yu Huiwen, Zhu Xufei, Song Ye
Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, China.
Langmuir. 2021 Apr 13;37(14):4340-4346. doi: 10.1021/acs.langmuir.1c00405. Epub 2021 Apr 1.
Porous anodic alumina (PAA) films with homogeneous nanopores are achieved by traditional anodization. Here, we present a unique anodization technique based on bipolar electrochemistry to fabricate PAA films with nanopore gradients. In an oxalic acid solution dissolved in ethylene glycol, a stable bipolar anodization process is realized. The PAA film prepared at 280 V exhibits a continuous change in interpore distance from ∼171 to ∼83 nm over a range of only 5 mm on the aluminum sheet. Higher driving voltages lead to larger interpore distances and steeper nanopore gradients. Further, no direct electrical connection is required for this bipolar anodization.
具有均匀纳米孔的多孔阳极氧化铝（PAA）膜是通过传统阳极氧化法制备的。在此，我们提出一种基于双极电化学的独特阳极氧化技术，以制备具有纳米孔梯度的PAA膜。在溶解于乙二醇的草酸溶液中，实现了稳定的双极阳极氧化过程。在280V电压下制备的PAA膜在铝板上仅5mm的范围内，孔间距从约171nm连续变化至约83nm。更高的驱动电压会导致更大 的孔间距和更陡的纳米孔梯度。此外，这种双极阳极氧化不需要直接的电连接。
