ACS Appl Mater Interfaces. 2018 Apr 25;10(16):14008-14016. doi: 10.1021/acsami.8b01026. Epub 2018 Apr 16.
Inspired by the epidermis-dermis composition of human skin, here we have simply developed a lightweight, robust, flexible, and biocompatible single-electrode triboelectric nanogenerator (S-TENG)-based prototype of bilayer artificial skin, by attaching one induction electrode with unfoamed skin layer of microcellular thermoplastic polyurethane (TPU) foam, which shows high-performance object manipulation [by responding differently toward different objects, viz., aluminum foil, balloon, cotton glove, human finger, glass, rubber glove, artificial leather, polyimide, poly(tetrafluoroethylene) (PTFE), paper, and wood], due to electrification and electrostatic induction during contact with the objects having different chemical functionalities. Comparative foaming behavior of ecofriendly supercritical fluids, viz., CO over N under variable temperatures (e.g., 130 and 150 °C) and constant pressure (15 MPa), have been examined here to pursue the soft and flexible triboelectric TPU foam. The foam derived by CO foaming at 150 °C has been prioritized for development of S-TENG. Foam derived by CO foaming at 130 °C did not respond as well due to the smaller cell size, higher hardness, and thicker skin. Inflexible N-derived foam was not considered for S-TENG fabrication. Object manipulation performance has been visualized by principal component analysis (PCA), which shows good discrimination among responses to different objects.
受人体皮肤表皮-真皮结构的启发，我们通过将一个感应电极附着在微多孔热塑性聚氨酯 (TPU) 泡沫的无泡皮肤层上，简单地开发了一种基于双层人工皮肤的轻巧、坚固、灵活和生物兼容的单电极摩擦纳米发电机 (S-TENG) 原型。这种原型对不同的物体（如铝箔、气球、棉手套、人手指、玻璃、橡胶手套、人造革、聚酰亚胺、聚四氟乙烯 (PTFE)、纸和木材）具有高性能的物体操控能力，这是因为在与具有不同化学功能的物体接触时会发生带电和静电感应。在这里，我们研究了环保超临界流体（例如 CO 在 N 下）在不同温度（例如 130 和 150°C）和恒定压力（15 MPa）下的比较发泡行为，以追求柔软灵活的摩擦电 TPU 泡沫。优先选择在 150°C 下由 CO 发泡得到的泡沫来开发 S-TENG。在 130°C 下由 CO 发泡得到的泡沫由于细胞尺寸较小、硬度较高和表皮较厚，因此反应不佳。不考虑用于 S-TENG 制造的刚性 N 衍生泡沫。通过主成分分析 (PCA) 可视化了物体操控性能，该分析显示了对不同物体的响应具有良好的区分能力。
