Effect of variations in manufacturing and material properties on the self-folding behaviors of hydrogel and elastomer bilayer structures
Effect of variations in manufacturing and material properties on the self-folding behaviors of hydrogel and elastomer bilayer structures
复制标题
制造和材料性能变化对水凝胶和弹性体双层结构自折叠行为的影响
DOI：
10.1039/d2sm01104b
复制
发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
Bae, Jinhye
中科院分区：
文献类型：
--
作者：
Zhao, Jiayu;Kazemi, Hesaneh;Kim, H. Alicia;Bae, Jinhye
刺激响应的自我折叠结构在自然界中无处不在，例如，含羞草折叠其叶子以响应外部触摸或热量，捕蝇草快速关闭以将昆虫困在里面。因此，自折叠结构的建模对于预测最终构型和理解折叠机制具有重要意义。在这里，我们应用一种简单而有效的方法来预测通过3D打印制造的温度响应性纳米复合材料水凝胶/弹性体双层结构的折叠角度，这有助于通过将模拟结果与实验测量的折叠角度进行比较来研究制造和材料特性中不可避免的变化对折叠角度的影响。我们的方法的定义特征是使用热膨胀来模拟温度响应性纳米复合水凝胶，而不是以前应用的扩散模型的非线性场论。模拟和实验测量的折叠角之间的结果差异（即，误差在5%左右。我们预计，我们的方法可以提供对刺激响应形状变形（即，4D打印），在软致动器、机器人和生物医学设备中具有潜在的应用。
The stimuli-responsive self-folding structure is ubiquitous in nature, for instance, the mimosa folds its leaves in response to external touch or heat, and the Venus flytrap snaps shut to trap the insect inside. Thus, modeling self-folding structures has been of great interest to predict the final configuration and understand the folding mechanism. Here, we apply a simple yet effective method to predict the folding angle of the temperature-responsive nanocomposite hydrogel/elastomer bilayer structure manufactured by 3D printing, which facilitates the study of the effect of the inevitable variations in manufacturing and material properties on folding angles by comparing the simulation results with the experimentally measured folding angles. The defining feature of our method is to use thermal expansion to model the temperature-responsive nanocomposite hydrogel rather than the nonlinear field theory of diffusion model that was previously applied. The resulted difference between the simulation and experimentally measured folding angle (i.e., error) is around 5%. We anticipate that our method could provide insight into the design, control, and prediction of 3D printing of stimuli-responsive shape morphing (i.e., 4D printing) that have potential applications in soft actuators, robots, and biomedical devices.