Untethered, ultra-light soft actuator based on positively charged 3D fluffy silica micro-nanofibers by electrospinning

Abstract

There is a growing interest in the design and fabrication of small-scale soft actuators and robotics, especially the realization of functionalities mimicking biological systems with biomimetic motions in response to external stimuli. However, the mobility and self-weight are still the critical challenges for further improvement and broader application of soft actuators. It is attractive to develop untethered and ultra-light small-scale robotics by integrating the actuators and drivers while achieving the ability to respond to external stimuli. Inspired by the spiders that rely on electrostatic forces in the environment to stay airborne by their ballooning silk, a positively charged fiber-paper structure-based soft actuator is proposed. Utilizing electrospinning of tetraethyl orthosilicate (TEOS) solution, this ultra-light soft actuator can realize the movement of bending and high-frequency vibration with the stimuli of electrostatic force in the electric field. Programmable motions, i.e., continuous bending with a series of angles, variable frequency vibration, can be realized by regulating the external electric field. The 3D fluffy structure of the silica micro-nanofibers and the paper-based structure endow the soft actuator with ultra-lightweight and excellent flexibility. The untethered, ultra-light soft actuator suggests a feasible approach to develop ultra-light, soft and autonomous robotics and holds promise in reconnaissance and environmental detection.

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Funding

This work is supported by the National Natural Science Foundation of China (No.51625504, 51675421, 91748209, 51827805, 51705407). This work is partially sponsored by National Key R&D Program of China (2016YFF0100700, 2017YFF0204803), Major science and technology special project (2016ZX04002003, 2016ZX04002004), the Specialized Research Fund for the Doctoral Program of Higher Education (2016M600785, 2016BSHEDZZ126, 2018T111048), and the Natural Science Foundation of Shaanxi Province (2018ZDCXL-GY-08–01, 2017ZDXM-GY-112, 2017JZ014).

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Correspondence to Weitao Jiang.

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Han, J., Jiang, W., Zhang, H. et al. Untethered, ultra-light soft actuator based on positively charged 3D fluffy silica micro-nanofibers by electrospinning. J Mater Sci 55, 12789–12800 (2020). https://doi.org/10.1007/s10853-020-04944-5

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