Recyclable silicone elastic light-triggered actuator with a reconfigurable Janus structure and self-healable performance
Recyclable silicone elastic light-triggered actuator with a reconfigurable Janus structure and self-healable performance
复制标题
可回收硅胶弹性光触发执行器，具有可重构Janus结构和自修复性能
DOI：
10.1039/d1py01632f
复制
发表时间：
2022
影响因子：
4.6
通讯作者：
Tian Ming
中科院分区：
文献类型：
--
作者：
Xu Xiaowei;Hao Xinyue;Hu Jing;Gao Weisheng;Ning Nanying;Yu Bing;Zhang Liqun;Tian Ming
硅橡胶是一种具有良好生物相容性和耐高低温性能的弹性体，在生物医学领域可用作智能材料的基体。作为智能材料吸引人的功能之一，其在多个刺激下的区域形状转变行为是非常有用的。为了生产具有这些特征的有机硅弹性体，通常需要特殊结构，例如Janus结构。本文提出了一种制备具有Janus结构的有机硅弹性光触发致动器的新策略，该致动器通过碳纳米管（CNT）增积引起的紫外光梯度强度诱导的非均相交联来制备。通过调整几何形状、UV照射的区域和时间以及刺激的位置，Janus膜可以被编程为具有多种类型的变形，并且表现出由有机溶剂或激光照射触发的形状变换。此外，由于蒽的可逆二聚化，膜可以容易地在Janus和均质结构之间切换，导致膜的重构。同时，该复合膜在60 °C甚至室温下表现出优异的自修复能力，并且由于可逆亚胺键引入到交联网络中，可以通过热压或溶液浇铸方法重复回收。这一策略为可自愈和可重构的柔性生物相容性致动器等的设计提供了重要的指导。
Silicone rubber is a type of elastomer that possesses excellent biocompatibility and a good resistance to high and low temperatures and can be used as the matrix of smart materials in the biomedical field. As one of the attractive functions of smart materials, their regional shape transformation behavior under multiple stimuli is very useful. In order to produce silicone elastomers with these characteristics, a special structure such as a Janus structure is usually required. Herein, a novel strategy to prepare a silicone elastic light-triggered actuator with a Janus structure has been developed, which was fabricated via heterogeneous crosslinking induced by a gradient intensity of UV light due to carbon nanotube (CNT) accretion. By tailoring the geometric shapes, the region and time of the UV irradiation and the location of the stimulus, the Janus membranes can be programmed with multiple types of deformations and exhibit a shape transformation triggered by organic solvent or laser irradiation. Additionally, the membrane can be readily switched between Janus and homogeneous structures due to the reversible dimerization of anthracene, resulting in the reconfiguration of the membrane. Meanwhile, the composite membrane exhibits an excellent self-healing ability at 60 °C, or even room temperature, and can be recycled repeatedly via the hot-pressing or solution casting methods because of the introduction of reversible imine bonds into the crosslinked networks. This strategy provides significant guidance for the design of self-healable and reconfigurable soft biocompatible actuators, and so forth.