Self-healing graphene oxide-based nanocomposite hydrogels serve as near-infrared light-driven valves
Self-healing graphene oxide-based nanocomposite hydrogels serve as near-infrared light-driven valves
复制标题
自修复氧化石墨烯基纳米复合水凝胶用作近红外光驱动阀
DOI：
10.1016/j.snb.2019.126908
复制
发表时间：
2019-11-01
影响因子：
8.4
通讯作者：
Wei, Jie
中科院分区：
文献类型：
--
作者：
Cheng, Yu;Ren, Kai;Wei, Jie
光驱动水凝胶驱动器在流体控制、软机器人和微反应器等领域显示出越来越大的优势。在此，我们提出了一种光热响应和自愈合的纳米复合水凝胶包含聚（N-异丙基丙烯酰胺）（PNIPAM）和聚（N，N-二甲基丙烯酰胺）（PDMAA），作为光驱动阀通过刺激双层和“铰链型”水凝胶复合物。由于聚合物链与粘土之间的非共价键合，含有氧化石墨烯（GO）和粘土的水凝胶具有良好的机械性能和近红外（NIR）驱动的自修复行为。这种双层型水凝胶在近红外激光的引导下呈现局部折叠，可以实现固/液传输和反应的可控触发。我们提出了通过NIR光愈合来整合不均匀结构以形成“铰链型”水凝胶，其由一个双层水凝胶作为“铰链”部分和两个PDMAA水凝胶作为“刀片”部分组成。“铰链型”水凝胶在辐照下呈现可重复的明显变形。因此，光热响应和自修复水凝胶可能在软致动器，微流体和微反应器中具有潜在的应用。
Light-driven hydrogel actuators show increasing advantages in flowing control, soft robot and microreactor. Herein, we proposed one photothermal responsive and self-healing nanocomposite hydrogel containing poly(Nisopropylacrylamide) (PNIPAM) and poly(N,N-dimethylacrylamide) (PDMAA) to serve as light-driven valves by stimulating the bilayer and "hinge-type" hydrogel composites. With graphene oxide (GO) and clay, the hydrogels possess good mechanical property and near-infrared (NIR)-driven self-healing behavior because of the noncovalent bonding between the polymer chains and clay. Such bilayer-type hydrogels present local folding with the guide of NIR laser and can realize solid/liquid transportation and controllable trigger of the reaction. We proposed the integration of inhomogeneous structure via NIR light healing to form "hinge-type" hydrogel, consisting of one bilayer hydrogel as the "hinge" section and two PDMAA hydrogels as the "blade" section. The "hinge-type" hydrogel presents repeatable and obvious deformation with irradiation. Thus, the photothermal responsive and self-healing hydrogel may have potential applications in soft actuator, microfluidic, and microreactor.