Zhang Rui, Zhang Yida, Li Zili, Xu Xiaobin, Xu Quan
School of Information Science and Technology, Fudan University Shanghai 200433 China.
National Synchrotron Radiation Laboratory, University of Science and Technology of China Hefei Anhui 230029 China.
RSC Adv. 2024 Dec 9;14(52):38806-38814. doi: 10.1039/d4ra04605f. eCollection 2024 Dec 3.
Boston ivy has received much attention from researchers owing to its exceptional climbing abilities. However, many aspects of their adhesion behavior remain unresolved. Our research has discovered a phenomenon of oxidation and discoloration in Boston ivy pads, which leads to a significant decrease in adhesion force. In this study, we conducted a comprehensive investigation into the oxidation discoloration phenomenon. Through XPS analysis, we confirmed that the transition from Fe to Fe in the pad is the primary cause of the oxidation discoloration reaction. Furthermore, by conducting adhesion testing using AFM, we observed a decrease in adhesion during the oxidation of iron ions. The magnitude of adhesion is closely related to the amount of pyrocatechol. Following the oxidation reaction, iron ions chelate with more pyrocatechol, resulting in a decrease in the available pyrocatechol content for adhesion. To validate this mechanism, we designed and prepared a biomimetic composite adhesion surface of a PDMS hydrogel. This composite surface improved oxidation resistance through the hydrogel, demonstrating improved adhesion performance. These findings offer promising prospects for the application of bionic materials in various fields.
爬山虎因其卓越的攀爬能力受到了研究人员的广泛关注。然而，其附着行为的许多方面仍未得到解决。我们的研究发现爬山虎吸盘存在氧化变色现象，这导致附着力显著下降。在本研究中，我们对氧化变色现象进行了全面调查。通过XPS分析，我们证实了吸盘中Fe向Fe的转变是氧化变色反应的主要原因。此外，通过使用AFM进行附着力测试，我们观察到铁离子氧化过程中附着力下降。附着力的大小与邻苯二酚的含量密切相关。氧化反应后，铁离子与更多的邻苯二酚螯合，导致可用于附着的邻苯二酚含量减少。为了验证这一机制，我们设计并制备了一种PDMS水凝胶仿生复合附着表面。这种复合表面通过水凝胶提高了抗氧化性，展示出了改善的附着性能。这些发现为仿生材料在各个领域的应用提供了广阔前景。
