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Nature-Inspired Sequential Shape Transformation of Energy-Patterned Hydrogel Sheets.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-06 , DOI: 10.1021/acsami.9b19342
Wenxin Fan 1 , Jincai Yin 1 , Chenglin Yi 2 , Yanzhi Xia 1 , Zhihong Nie 2 , Kunyan Sui 1
Affiliation  

The design of materials that can mimic encoded shape evolution in nature is important but challenging. Here we present a simple yet versatile strategy for programming the sequential deformation of hydrogel sheets to acquire desired actuation motions and geometric shapes. The method relies on the dual-gradient structure-enabled snapping deformation of hydrogels through the accumulation and burst release of elastic energy, as well as the patterning of the prestored energy in gels. Pretreating distinct regions of the hydrogel sheets with different durations of the same stimulus (or with different stimuli) allows for locally prestoring chemical energy that can be converted to temporospatially patterned elastic energy and abruptly released to drive the successive snapping of different regions of hydrogels in predefined onset sequences. The sequence of energy release (i.e., the sequence of snapping deformation) of the local regions for hydrogels can be reprogrammed by different local prestimulation methods, which allows one gel to deform into various defined geometric configurations. The general mathematic criteria are developed to predict the energy release and snapping of the hydrogels. This work can provide guidance for the design of new-generation actuators and soft robotics.

中文翻译:

受能量启发的水凝胶片材受到自然启发的顺序形状转换。

可以模仿自然界中编码形状演化的材料的设计很重要,但是具有挑战性。在这里,我们提出了一种简单而通用的策略,用于对水凝胶片的顺序变形进行编程,以获取所需的驱动运动和几何形状。该方法依靠通过弹性能量的积累和爆发释放以及凝胶中预存储的能量的图案化使水凝胶具有双梯度结构的吸附变形。用相同持续时间(或不同刺激)的不同持续时间对水凝胶片材的不同区域进行预处理,可以局部存储化学能,该化学能可以转换为时空图案化的弹性能并突然释放,以驱动水凝胶的不同区域连续捕捉到预定的区域发作顺序。可以通过不同的局部预刺激方法来重新编程水凝胶局部区域的能量释放序列(即,快速变形序列),这可以使一种凝胶变形为各种定义的几何构型。发展了通用数学标准来预测水凝胶的能量释放和吸收。这项工作可以为新一代执行器和软机器人的设计提供指导。
更新日期:2020-01-16
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