Thermally induced reversible and reprogrammable actuation of tough hydrogels utilising ionoprinting and iron coordination chemistry
Thermally induced reversible and reprogrammable actuation of tough hydrogels utilising ionoprinting and iron coordination chemistry
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DOI：
10.1016/j.snb.2017.07.095
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发表时间：
2018-01-01
影响因子：
8.4
通讯作者：
Trask, Richard S.
中科院分区：
文献类型：
--
作者：
Baker, Anna B.;Wass, Duncan F.;Trask, Richard S.
离子印刷已经被证明是一种能够通过各种不同的驱动途径将水凝胶重复合成后编程成各种不同形状的技术。迄今为止，离子打印技术仅限于传统的脆性水凝胶，并且需要改变浸没溶液才能实现可逆驱动。在这项研究中，离子印刷首次与具有双pH和温度响应性的更坚韧的互穿网络聚合物（IPN）水凝胶结合在一起。这种新方法消除了通常在水凝胶形状变化编程和驱动过程中发生的脆性材料破坏，从而允许实现比以前演示的更高应变和更复杂的形状形成。关键的是，该系统的温度响应性可以通过外部刺激在展开（2D）和折叠（3D）形状之间进行驱动；无需更换浸没液即可实现可逆驱动。在这里，可逆的热诱导驱动首次被证明是通过形成复杂的多折叠结构，包括折纸鹤鸟和三浦折叠，从平面水凝胶片。IPN水凝胶的鲁棒性通过多次重编程循环和重复驱动形成三维形状（六边形、螺旋形和锯齿形）的单个水凝胶片来证明。这些进步极大地提高了离子印刷的适用性，将其应用扩展到软机器人、生物医学工程和环境智能传感器领域。(C) 2017年作者。Elsevier B.V.出版
Ionoprinting has proven itself as a technique capable of enabling repeated post-synthesis programming of hydrogels into a variety of different shapes, achieved through a variety of different actuation pathways. To date, the technique of ionoprinting has been limited to conventional brittle hydrogels, with reversible actuation requiring a change in submersion solution. In this study, ionoprinting has been combined for the first time with a tougher interpenetrating network polymer (IPN) hydrogel with dual pH and temperature responsiveness. This new methodology eliminates the brittle material failure typically occurring during shape change programming and actuation in hydrogels, thus allowing for the realisation of more highly strained and complex shape formation than previously demonstrated. Critically, the temperature responsiveness of this system enables actuation between an unfolded (2D) and a folded (3D) shape through an external stimuli; enabling reversible actuation without a change in submersion solution. Here, the reversible thermally induced actuation is demonstrated for the first time through the formation of complex multi-folded architectures, including an origami crane bird and Miura folds, from flat hydrogel sheets. The robustness of the IPN hydrogel is demonstrated through multiple reprogramming cycles and repeated actuation of a single hydrogel sheet formed into 3D shapes (hexagon, helix and zig-zag). These advancements vastly improve the applicability of ionoprinting extending its application into areas of soft robotics, biomedical engineering and enviro intelligent sensors. (C) 2017 The Authors. Published by Elsevier B.V.