Sakamoto Shun, Itatani Masaki, Tsukada Kanta, Nabika Hideki
Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Materials (Basel). 2021 Mar 20;14(6):1526. doi: 10.3390/ma14061526.
The Liesegang phenomenon can be used for micro- and nanofabrication processes to yield materials with periodic precipitation of diverse types of materials. Although there have been several attempts to control the periodicity of the Liesegang patterns, it remains unclear whether the periodic precipitation of AgCl in gel medium causes regular- or revert-type patterns. To confirm the periodicity of the AgCl pattern, we conduct one-dimensional experiments under various ion concentration conditions. From microscopic observations, three different precipitation modes were observed, i.e., continuous precipitation with a sharp front, periodic precipitation and continuous precipitation with a gradual front. For these three modes, numerical analyses of the pattern geometry are performed for the periodic precipitation. It was confirmed that the regular-type pattern appeared for all concentration conditions conducted in the present experiments. Furthermore, the pattern was found to obey the spacing law and the Matalon-Packter law. From our experiments, we concluded that AgCl forms regular-type Liesegang patterns, regardless of the dimension of diffusion.
李泽冈现象可用于微纳制造工艺，以制备具有多种材料周期性沉淀的材料。尽管已经有几次尝试控制李泽冈图案的周期性，但凝胶介质中氯化银的周期性沉淀究竟会产生规则型还是反转型图案仍不清楚。为了确认氯化银图案的周期性，我们在各种离子浓度条件下进行了一维实验。通过显微镜观察，观察到三种不同的沉淀模式，即具有尖锐前沿的连续沉淀、周期性沉淀和具有渐变前沿的连续沉淀。对于这三种模式，对周期性沉淀进行了图案几何形状的数值分析。结果证实，在本实验所进行的所有浓度条件下均出现了规则型图案。此外，还发现该图案符合间距定律和马塔隆-帕克特定律。通过我们的实验，我们得出结论，无论扩散维度如何，氯化银都会形成规则型李泽冈图案。
