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Plant‐Inspired Soft Bistable Structures Based on Hygroscopic Electrospun Nanofibers
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-01-15 , DOI: 10.1002/admi.201901310 Dario Lunni 1, 2, 3 , Matteo Cianchetti 2, 3 , Carlo Filippeschi 1 , Edoardo Sinibaldi 1 , Barbara Mazzolai 1
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-01-15 , DOI: 10.1002/admi.201901310 Dario Lunni 1, 2, 3 , Matteo Cianchetti 2, 3 , Carlo Filippeschi 1 , Edoardo Sinibaldi 1 , Barbara Mazzolai 1
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The tissue composition and microstructures of plants have dynamic morphologies that change according to their environments. Recently, multifunctional responsive materials and smart structures also took inspiration from these plants' features. Dionaea muscipula leaves provide a remarkable example of an optimized structure that, owing to the synergistic integration of bistability, material, and geometrical properties, permits to overcome the performance limits of purely diffusive processes. In this paper, a hygroscopic bistable structure (HBS) inspired by the Venus flytrap leaves is presented, obtained by bonding prestretched poly(dimethylsiloxane) (PDMS) layers prior to depositing electrospun polyethylene oxide (PEO) nanofibers. A hygroresponsive bilayer (HBL) is also obtained by electrospinning of PEO on an unstretched PDMS layer. The hygroscopic material (Young's modulus and hygroscopic expansion) is mechanically characterized so as to predict the response time of a bending HBL in response to a step humidity variation. The HBS response time (≈1 s) is sensibly lower than the one of purely diffusive HBL (≈10 s) thanks to bistability. An illustrative implementation is also presented, exploiting an HBS to trigger the curvature of a PDMS optical focusing system. The developed plant‐inspired soft bistable structure can also be used for sensing (e.g., humidity), energy harvesting, as well as advanced soft robotics applications.
中文翻译：
基于吸湿电纺纳米纤维的植物启发性软双稳态结构
植物的组织组成和微结构具有根据其环境而变化的动态形态。最近，多功能响应式材料和智能结构也从这些植物的功能中得到启发。小菜蛾树叶提供了一个优化结构的杰出示例，由于其双稳性，材料和几何特性的协同集成，可以克服纯扩散过程的性能限制。本文提出了一种受维纳斯捕蝇草叶启发的吸湿双稳态结构（HBS），该结构是通过在沉积电纺聚环氧乙烷（PEO）纳米纤维之前粘合预拉伸的聚（二甲基硅氧烷）（PDMS）层而获得的。还可以通过在未拉伸的PDMS层上静电纺丝PEO来获得保湿层（HBL）。对吸湿材料（杨氏模量和吸湿膨胀）进行机械表征，以便预测弯曲HBL响应阶跃湿度变化的响应时间。由于双稳态，HBS响应时间（≈1s）明显低于纯扩散HBL（≈10 s）之一。还提出了说明性实施方式，其利用HBS来触发PDMS光学聚焦系统的曲率。先进的植物启发式软双稳态结构还可用于传感（例如湿度），能量收集以及先进的软机器人应用。
更新日期：2020-01-15
中文翻译：
基于吸湿电纺纳米纤维的植物启发性软双稳态结构
植物的组织组成和微结构具有根据其环境而变化的动态形态。最近，多功能响应式材料和智能结构也从这些植物的功能中得到启发。小菜蛾树叶提供了一个优化结构的杰出示例，由于其双稳性，材料和几何特性的协同集成，可以克服纯扩散过程的性能限制。本文提出了一种受维纳斯捕蝇草叶启发的吸湿双稳态结构（HBS），该结构是通过在沉积电纺聚环氧乙烷（PEO）纳米纤维之前粘合预拉伸的聚（二甲基硅氧烷）（PDMS）层而获得的。还可以通过在未拉伸的PDMS层上静电纺丝PEO来获得保湿层（HBL）。对吸湿材料（杨氏模量和吸湿膨胀）进行机械表征，以便预测弯曲HBL响应阶跃湿度变化的响应时间。由于双稳态，HBS响应时间（≈1s）明显低于纯扩散HBL（≈10 s）之一。还提出了说明性实施方式，其利用HBS来触发PDMS光学聚焦系统的曲率。先进的植物启发式软双稳态结构还可用于传感（例如湿度），能量收集以及先进的软机器人应用。
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