Light-triggered reversible phase transition of non-photoresponsive PNIPAm for remote-controlled smart objects
Light-triggered reversible phase transition of non-photoresponsive PNIPAm for remote-controlled smart objects
复制标题
用于远程控制智能物体的非光响应 PNIPAm 的光触发可逆相变
DOI：
10.1016/j.cej.2022.140636
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发表时间：
2023-02-02
影响因子：
15.1
通讯作者：
Wang，Yiming
中科院分区：
文献类型：
--
作者：
Zhang，Jiahao;Bai，Shengyu;Wang，Yiming
聚N-异丙基丙烯酰胺（PNIPAm）因其热响应性而被广泛应用于智能材料和器件。在这里，我们演示了如何PNIPAm可以调整，以显示可逆的相变响应于光，而不是通过一个简单的信号转换策略的温度。这种策略不需要用任何光敏部分对聚合物进行繁琐的修饰，为远程控制智能物体提供了一种新方法。我们的概念是使用光酸和简单的PNIPAm基共聚物实现的。在打开/关闭光时，光酸释放/捕获化学信号，该化学信号可以可逆地改变共聚物的下临界溶解温度（LCST），从而导致共聚物的快速（<0.5分钟）和可逆的相变，而不改变环境温度。在此基础上，制备了一系列由该共聚物组成的光控动态图案和概念性智能软致动器。这种信号转换策略使PNIPAm光响应性可以促进具有自适应响应性的新的非接触式智能物体的开发。
Poly(N-isopropylacrylamide) (PNIPAm) is widely used for smart materials and devices owing to its thermoresponsiveness. Here we demonstrate how PNIPAm can be geared to show reversible phase transition in response to light rather than temperature through a simple signal transformation strategy. This strategy does not require the polymer to be tediously modified with any photoresponsive moieties, offering a new approach towards remote-controlled smart objects. Our concept is achieved using a photoacid and simple PNIPAm-based copolymers. Upon switching on/off light, the photoacid releases/captures a chemical signal which can reversibly change the lower critical solution temperature (LCST) of the copolymers, thereby resulting in a fast (<0.5 min) and reversible phase transition of the copolymer without changing the ambient temperature. Thereon, a series of light-controlled dynamic patterns and conceptually smart soft actuators composed of the copolymers are fabricated. Such a signal transformation strategy enabling PNIPAm photoresponsiveness may boost the development of new non-contact smart objects with adaptive responsiveness.