Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.
School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China.
Small. 2020 Dec;16(48):e2005461. doi: 10.1002/smll.202005461. Epub 2020 Nov 9.
Inspired by nature, diverse biomimetic hydrogel actuators are fabricated and become one of the most essential components of bionics research. Usually, the anisotropic structure of a hydrogel actuator is generated at the early fabrication process, only a specific shape transformation behavior can be produced under external stimuli, and thus has limited the development of hydrogel actuators toward the biomimetic shape deformation behavior. Herein, a novel bilayer hydrogel having a thermoresponsive actuating layer and a metal ion-responsive memorizing layer is proposed, therefore, a 2D hydrogel film can be fixed into various 3D shapes via supramolecular metal-ligand coordination, with further realizing programmable 4D shape deformation under the stimulus of temperature. By manipulating the temporary shapes via shape memory behavior, various temporary anisotropic structures can be obtained via the bilayer hydrogel, thus producing diverse reversible shape deformation performances, which is expected to promote the development of intelligent polymeric materials.
受自然启发，各种仿生水凝胶驱动器被制造出来，成为仿生研究中最重要的组件之一。通常，水凝胶驱动器的各向异性结构在早期制造过程中生成，只能在外力刺激下产生特定的形状转变行为，从而限制了水凝胶驱动器向仿生形状变形行为的发展。在此，提出了一种具有温敏致动层和金属离子响应记忆层的新型双层水凝胶，因此，通过超分子金属配体配位，可以将二维水凝胶薄膜固定成各种三维形状，并进一步在温度刺激下实现可编程的 4D 形状变形。通过形状记忆行为来操纵临时形状，可以通过双层水凝胶获得各种临时各向异性结构，从而产生各种可逆的形状变形性能，这有望促进智能聚合物材料的发展。
