School of Resource and Environmental Science, Hubei Engineering Center of Natural Polymers-Based Medical Materials, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China.
ACS Appl Mater Interfaces. 2022 Feb 2;14(4):6251-6260. doi: 10.1021/acsami.1c24430. Epub 2022 Jan 21.
Joint wrinkles in animals facilitate frequent bending and contribute to the duration of the joint. Inspired by the morphology and function of joint wrinkles, we developed a bionic hydration-induced polymeric actuator with constructed wrinkles at the selected area. Specifically, we adopt electrical writing to create defined single and double cross-linking regions on chitosan (CS) hydrogel. The covalent cross-linking network was constructed by electrical writing-induced covalent cross-linking between CS chains and epichlorohydrin. Subsequent treatment of sodium dodecyl sulfate allows electrostatic cross-linking at the unwritten area with the simultaneous formation of surface wrinkles. The resulting single and double cross-linking hydrogel demonstrates spontaneous deformation behaviors by the influx and efflux of HO to the electrostatic cross-linking domain under different ion concentrations. Importantly, the wrinkle structure endows the hydrogel with extraordinary antifatigue bending performance. By regulating the surface morphology and spatial cross-linking, we can design novel biomimetic polysaccharide hydrogel actuators with fascinating functions.
关节褶皱使动物的关节更灵活，也有助于延长关节的使用寿命。受关节褶皱的形态和功能的启发，我们在选定区域开发了一种具有仿生水合诱导聚合物致动器，该致动器具有构建的褶皱。具体来说，我们采用电写入技术在壳聚糖（CS）水凝胶上创建定义的单交联和双交联区域。通过电写入诱导 CS 链之间的共价交联和环氧氯丙烷的共价交联网络构建。随后用十二烷基硫酸钠处理，允许在未写入区域发生静电交联，同时形成表面褶皱。所得的单交联和双交联水凝胶通过在不同离子浓度下向静电交联域内的水合氢离子的流入和流出，表现出自发的变形行为。重要的是，褶皱结构赋予水凝胶非凡的抗疲劳弯曲性能。通过调节表面形态和空间交联，我们可以设计具有迷人功能的新型仿生多糖水凝胶驱动器。
