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Anisotropic nanocomposite hydrogels with enhanced actuating performance through aligned polymer networks
Science China Materials ( IF 8.1 ) Pub Date : 2020-01-18 , DOI: 10.1007/s40843-019-1236-8
Ping Tang , Hao Yan , Lie Chen , Qingshan Wu , Tianyi Zhao , Shuhong Li , Hainan Gao , Mingjie Liu

Anisotropic composite hydrogels have wide applications in the fields of materials for actuators and sensors. Herein, we report an anisotropic composite hydrogel prepared by a mechanical-strain-induced method. Polymer networks including poly(N-isopropylacrylamide) (PNIPAM) and sodium alginate (SA), as well as carbon nanotubes (CNTs) are found to align simultaneously by stretching, and then fixed by physical crosslinking through non-covalent bonds. Composite hydrogels with doubly aligned polymer networks showed anisotropic optical and mechanical properties. The actuation performance of the anisotropic composite hydrogels as compared with the isotropic ones was found to be enhanced, which showed the capability of lifting 100 times its weight with 20% contraction strain. Besides, a bilayer hydrogel was designed to bend with a maximum of 390° to mimic the tendril behavior of plants.



中文翻译:

各向异性纳米复合水凝胶,通过对齐的聚合物网络具有增强的驱动性能

各向异性复合水凝胶在致动器和传感器的材料领域具有广泛的应用。在本文中,我们报道了通过机械应变诱导方法制备的各向异性复合水凝胶。包括poly(N-异丙基丙烯酰胺(PNIPAM)和藻酸钠(SA)以及碳纳米管(CNT)通过拉伸同时对齐,然后通过非共价键进行物理交联而固定。具有双重排列的聚合物网络的复合水凝胶显示出各向异性的光学和机械性能。发现与各向同性的各向异性复合水凝胶相比,其致动性能得到了增强,表现出在20%的收缩应变下能够举起其重量100倍的能力。此外,设计了双层水凝胶以最大390°弯曲以模仿植物的卷须行为。

更新日期:2020-04-23
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