Abstract
Development of miniaturized three-dimensional (3D) fliers with integrated functional components has important implications to a diverse range of engineering areas. Among the various active and passive miniaturized 3D fliers reported previously, a class of 3D electronic fliers inspired by wind-dispersed seeds show promising potentials, owing to the lightweight and noiseless features, aside from the stable rotational fall associated with a low falling velocity. While on-demand shape-morphing capabilities are essential for those 3D electronic fliers, the realization of such miniaturized systems remains very challenging, due to the lack of fast-response 3D actuators that can be seamlessly integrated with 3D electronic fliers. Here we develop a type of morphable 3D mesofliers with shape memory polymer (SMP)-based electrothermal actuators, capable of large degree of actuation deformations, with a fast response (e.g., ∼1 s). Integration of functional components, including sensors, controllers, and chip batteries, enables development of intelligent 3D mesoflier systems that can achieve the on-demand unfolding, triggered by the processing of real-time sensed information (e.g., acceleration and humidity data). Such intelligent electronic mesofliers are capable of both the low-air-drag rising and the low-velocity falling, and thereby, can be used to measure the humidity fields in a wide 3D space by simple hand throwing, according to our demonstrations. The developed electronic mesofliers can also be integrated with other types of physical/chemical sensors for uses in different application scenarios.
摘要
集成功能器件的三维(3D)微型飞行器在工程领域多个方面都具有重要意义. 在近期报道的各种主动和被动型三维微型飞行器中, 一类由风传种子启发的三维飞行器因其具备低速自旋稳定下落、 超轻、 静音等特点, 显示出巨大的应用潜力. 具备按需形状重构的能力对于这类三维飞行器至关重要, 然而由于缺乏可与三维飞行器无缝集成的快速响应驱动器, 制造这类智能微型飞行器系统仍然具有挑战. 在这项研究工作中, 我们开发了一种基于形状记忆聚合物(SMP)电热驱动器的可变形三维介观飞行器, 其能够实现较大驱动变形和快速响应(∼1 s). 通过集成传感器、控制器和微型锂电池等功能器件, 我们开发了一种智能三维介观飞行器系统. 该系统通过实时处理感知的信息(如加速度和湿度数据)以实现按需展开. 这种智能电子介观飞行器具备低阻上升和低速下降的能力, 本文演示了通过简单的投掷测量广阔空间的湿度场分布. 此外, 这种智能三维介观飞行器还可以集成其他类型的物理/化学传感器以适应不同的应用场景.
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Acknowledgements
Zhang Y acknowledges support from the National Natural Science Foundation of China (12050004 and 11921002), the Tsinghua National Laboratory for Information Science and Technology, and a grant from the Institute for Guo Qiang, Tsinghua University (2019GQG1012). Song H acknowledges support from the National Natural Science Foundation of China (11902178), the Natural Science Foundation of Beijing Municipality (3204043), and China Postdoctoral Science Foundation (2019M650648). Xue Z acknowledges support from the National Natural Science Foundation of China (61904095).
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Author contributions Zhang Y, Song H, and Xue Z conceived the idea; Zhao J and Ji Z performed numerical simulations; Song H, Ji Z, Xu S, Pang W, Hu X, Zhang F, Jin T, Shuai Y, Lan Y, Cheng D, Man W, and Bo R designed and performed the fabrication and measurements of electrothermal actuators and mesoflier structures; Song H, Ji Z, and Xue Z performed the fabrication and measurements of electronic mesoflier systems; Zhang Y, Xue Z, Zhao J, Song H, and Ji Z wrote the manuscript. All authors discussed and reviewed the final version.
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Supplementary information Supporting data are available in the online version of the paper.
Ziyao Ji is a PhD student under the supervision of Prof. Yihui Zhang at Tsinghua University. His research interest focuses on mechanically-guided 3D assembly.
Jianzhong Zhao received his PhD degree from Shanghai University in 2021. He is now a postdoctoral fellow at Tsinghua University. His research interest focuses on mechanically-guided 3D assembly and mechanics of flexible electronics.
Honglie Song received his PhD degree from Jilin University in 2017. He is now a postdoctoral fellow at Tsinghua University. His research interest focuses on the flexible and stretchable electronics, mechanically-guided 3D assembly, and bionic sensing/perception.
Zhaoguo Xue is an associate professor at Beihang University. He received his PhD degree from Nanjing University in 2018, and worked as a postdoctoral fellow at Tsinghua University from 2018 to 2020. His research interest includes mechanically-guided 3D assembly, stretchable and flexible nanoelectronics, and semiconductor nanomaterials.
Yihui Zhang is a professor at Tsinghua University. He received his PhD degree from Tsinghua University in 2011, and worked as a postdoctoral fellow from 2011 to 2014, and as a research assistant professor from 2014 to 2015, both at Northwestern University. His research interests include mechanically-guided 3D assembly, unusual soft materials, and stretchable electronics.
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Ji, Z., Zhao, J., Song, H. et al. Morphable three-dimensional electronic mesofliers capable of on-demand unfolding. Sci. China Mater. 65, 2309–2318 (2022). https://doi.org/10.1007/s40843-022-2007-8
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DOI: https://doi.org/10.1007/s40843-022-2007-8