Wireless miniature soft actuators are promising for various potential high-impact applications in medical, robotic grippers, and artificial muscles. However, these miniature soft actuators are currently constrained by a small output force and low work capacity. To address such challenges, we report a miniature magnetic phase-change soft composite actuator. This soft actuator exhibits an expanding deformation and enables up to a 70 N output force and 175.2 J/g work capacity under remote magnetic radio frequency heating, which are 106 -107 times that of traditional magnetic soft actuators. To demonstrate its capabilities, we first design a wireless soft robotic device that can withstand 0.24 m/s fluid flows in an artery phantom. By integrating it with a thermally-responsive shape-memory polymer and bistable metamaterial sleeve, we design a wireless reversible bistable stent towards for future potential angioplasty applications. Moreover, it can additionally locomote inside and jump out of granular media. At last, the phase-change actuator can realize programmable bending deformations when a specifically designed magnetization profile is encoded, enhancing its shape-programming capability. Such a miniature soft actuator provides an approach to enhance the mechanical output and versatility of magnetic soft robots and devices, extending their medical and other potential applications. This article is protected by copyright. All rights reserved.
high work capacity; magnetic soft composites; miniature wireless soft device; phase-change materials; programmable shape deformation.
This article is protected by copyright. All rights reserved.
Miniature coiled artificial muscle for wireless soft medical devices.
Sci Adv. 2022 Mar 11;8(10):eabm5616. doi: 10.1126/sciadv.abm5616. Epub 2022 Mar 11.
Sci Adv. 2022.
Free PMC article.
Programmable deformation of patterned bimorph actuator swarm.
Natl Sci Rev. 2020 Apr;7(4):775-785. doi: 10.1093/nsr/nwz219. Epub 2020 Jan 20.
Natl Sci Rev. 2020.
Free PMC article.
Photocrosslinking Patterning of Single-Layered Polymer Actuators for Controllable Motility and Automatic Devices.
ACS Appl Mater Interfaces. 2019 May 1;11(17):16252-16259. doi: 10.1021/acsami.9b04258. Epub 2019 Apr 16.
ACS Appl Mater Interfaces. 2019.
Bistable and Multistable Actuators for Soft Robots: Structures, Materials, and Functionalities.
Adv Mater. 2022 May;34(19):e2110384. doi: 10.1002/adma.202110384. Epub 2022 Mar 15.
Adv Mater. 2022.
Locomotion of Miniature Soft Robots.
Adv Mater. 2021 May;33(19):e2003558. doi: 10.1002/adma.202003558. Epub 2020 Dec 18.
Adv Mater. 2021.