A general strategy for fabricating a double layer self-deformed shape memory hydrogel which includes a thermo-responsive actuating layer and a pH-responsive memorizing layer is presented. Compared with traditional shape memory polymer systems, the temporary shape of the hydrogel could be generated by a thermo-responsive actuating layer upon the trigger of heat without the need for an external force, which could be further memorized by the pH-responsive memorizing layer.

中文翻译：

---

激活和记忆双层水凝胶以实现自变形的形状记忆功能

提出了制备双层自变形形状记忆水凝胶的一般策略，该双层自变形形状记忆水凝胶包括热响应性致动层和pH响应性记忆层。与传统的形状记忆聚合物系统相比，水凝胶的临时形状可以由热响应的致动层在触发热量时产生，而无需外力，而外力可以由pH响应的记忆层进一步记忆。