A novel leaf inspired hydrogel film based on fiber reinforcement as rapid steam sensor
A novel leaf inspired hydrogel film based on fiber reinforcement as rapid steam sensor
复制标题
一种基于纤维增强的新型叶子启发水凝胶薄膜作为快速蒸汽传感器
DOI：
10.1016/j.cej.2019.122948
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发表时间：
2020-02-15
影响因子：
15.1
通讯作者：
Zhu, Meifang
中科院分区：
文献类型：
--
作者：
Hou, Kai;Nie, Yuanling;Zhu, Meifang
具有双层结构的智能水凝胶薄膜是一种很有前途的智能器件材料。尽管设计具有优异的机械性能、坚韧的界面粘附和快速形状变形的双层水凝胶是重要的，但它们的简单路线构建仍然具有挑战性。在这项工作中，灵感来自叶片结构，一个非常简单的铸造策略，建立了制备双层智能水凝胶膜与细菌纤维素（BC）的增强。在NIPAM/粘土预凝胶水溶液向BC网络主动扩散的驱动下，可直接制备具有双网络界面的坚韧纤维增强Gel@BC双层水凝胶。所制备的Gel@BC双层水凝胶具有优异的机械性能，因为BC充当连续增强相，如叶片的静脉。由于PNIPAM/粘土纳米复合水凝胶填充到BC网络中，在界面处形成双网络结构，界面韧性达到10（2）J/m2左右。由于双层结构引起的各向异性溶胀，Gel@BC双层水凝胶提供了显著的快速温度诱导的可调形状转变，并表现出可逆的弯曲行为。特别是，即使在热环境中，BC的非溶胀特性也有利于Gel@BC的机械稳定性和形状变形。这种简单的连续纤维增强策略为制造仿生驱动器提供了重要的指导，这些驱动器在软机器人中具有应用，例如用于环境调节的仿生气孔和作为蒸汽探测器的电路开关。
Intelligent hydrogel films with bilayer structures are promising materials as smart devices. Although the design of bilayer hydrogels with excellent mechanical properties, tough interfacial adhesion and rapid shape deformation is important, their construction in simple route is still challenging. In this work, inspired by leaf structure, an extremely simple casting strategy is established for preparing bilayer intelligent hydrogel films with bacterial cellulose (BC) for reinforcement. Driven by active diffusion of aqueous NIPAM/clay pre-gel solution into BC network, a tough fiber reinforced Gel@BC bilayer hydrogel with double network interface could be directly fabricated. The as-prepared Gel@BC bilayer hydrogel possessed exceptional mechanical properties since BC acted as the continuous reinforcement phase like vein of the leaves. The interfacial toughness reached similar to 10(2) J/m(2) because the PNIPAM/clay nanocomposite hydrogel was filled into BC network to form the double network structure at the interface. Due to the anisotropic swelling induced by bilayer structure, the Gel@BC bilayer hydrogel provided remarkable rapid temperature-induced tunable shape transformation and exhibited a reversible bending behavior. In particular, the non-swelling characteristic of BC is beneficial for the mechanical stable and shape deformation of Gel@BC even in hot environment. This simple continuous fiber reinforcement strategy provides significant guidance for fabricating biomimetic actuators with applications in soft robotics such as bionic stomata for environment regulation and circuit switch as steam detectors.