Snap-Buckling Motivated Controllable Jumping of Thermo-Responsive Hydrogel Bilayers
Snap-Buckling Motivated Controllable Jumping of Thermo-Responsive Hydrogel Bilayers
复制标题
卡扣屈曲驱动的热响应水凝胶双层的可控跳跃
DOI：
10.1021/acsami.8b16402
复制
发表时间：
2018-12-05
影响因子：
9.5
通讯作者：
Fu, Jun
中科院分区：
文献类型：
--
作者：
Gao, Guorong;Wang, Zhenwu;Fu, Jun
响应式水凝胶致动器在各个领域都有广阔的应用前景。大多数水凝胶致动器受到缓慢致动或形状变换的限制。本工作报告的温度响应性水凝胶双层的卡扣屈曲动机跳跃。双层由聚（NIPAM-co-DMAPMA）/粘土水凝胶组成，每层具有不同的低临界溶解温度，因此在温度变化时发生缓慢的可逆卷曲/解卷。这种凝胶可以粘附在包括铝在内的多种材料上。利用凝胶与铝棘轮之间的粘附力来限制双层的温敏变形以存储弹性能量。当累积的弹性能破坏凝胶-铝粘附时，发生突然屈曲，释放累积的能量，从而促使双层跳跃。跳跃方向、开始时间、高度和距离由双层或棘轮的几何形状控制。这项工作为以受控方式快速驱动响应性水凝胶铺平了新的道路，并可能刺激新型水凝胶装置的发展。
Responsive hydrogel actuators have promising applications in diverse fields. Most hydrogel actuators are limited by slow actuation or shape transformations. This work reports on snap-buckling motivated jumping of thermoresponsive hydrogel bilayers. The bilayers are composed of poly(NIPAM-co-DMAPMA)/clay hydrogel with different lower critical solution temperatures in each layer, and thus undergo slow reversible curling/uncurling at temperature changes. The gels are adhesive to numerous materials including aluminum. The adhesion between the gels and an aluminum ratchet is utilized to constrain the thermoresponsive deformation of the bilayers to store elastic energy. When the accumulated elastic energy overwhelms the gel-aluminum adhesion, snap-buckling takes place to abruptly release the accumulated energy, which motivates the bilayer to jump. The jumping direction, start time, height, and distance are controlled by the geometry of the bilayers or the ratchet. This work paves a novel way for the rapid actuation of responsive hydrogels in a controlled manner and may stimulate the development of novel hydrogel devices.