Theory of hard magnetic soft materials to create magnetoelectricity

Rahmati, Amir Hossein; Jia, Rong; Tan, Kai Liang; Zhao, Xuanhe; Deng, Qian; Liu, Liping; Sharma, Pradeep

doi:10.1016/j.jmps.2022.105136

Cited by 21 publications

(2 citation statements)

References 92 publications

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“…Under an external magnetic field (vector B ), the domains of these particles align with the field, leading to large, macroscopic bending deformation of the structure (Figure a). Simultaneously, the process connotes notable nonlinear multiphysics field coupling characteristics. ,− To understand and predict the behaviors of these materials under magnetic actuation, we developed an integrated analytical model grounded in the principles of continuum mechanics.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Magnetic Soft Robotics: Integrating Fiber Optics and 3D Printing for Rapid Actuation and Precision Sensing

Han,

Gao,

Wang

2024

ACS Appl. Mater. Interfaces

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Timely, accurate, and rapid grasping of dynamic change information in magnetic actuation soft robots is essential for advancing their evolution toward intelligent, integrated, and multifunctional systems. However, existing magnetic-actuation soft robots lack effective functions for integrating sensing and actuation. Herein, we demonstrate the integration of distributed fiber optics technology with advanced-programming 3D printing techniques. This integration provides our soft robots unique capabilities such as integrated sensing, precise shape reconstruction, controlled deformation, and sophisticated magnetic navigation. By utilizing an improved magneto-mechanical coupling model and an advanced inversion algorithm, we successfully achieved real-time reconstruction of complex structures, such as ‘V’, ‘N’, and ‘M’ shapes and gripper designs, with a notable response time of 34 ms. Additionally, our robots demonstrate proficiency in magnetic navigation and closed-loop deformation control, making them ideal for operation in confined or obscured environments. This work thus provides a transformative strategy to meet unmet demands in the rapidly growing field of soft robotics, especially in establishing the theoretical and technological foundation for constructing digitized robots.

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Section: Resultsmentioning

confidence: 99%

Enhanced Magnetic Soft Robotics: Integrating Fiber Optics and 3D Printing for Rapid Actuation and Precision Sensing

Han,

Gao,

Wang

2024

ACS Appl. Mater. Interfaces

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“…where F is the magnetic force, A is the cross-sectional area of the coil's core, and g is the gap length. To evaluate the deformation of the flexible magnet, the relationship between the electromagnetic force and corresponding deformation was calculated as follows [41][42][43]:…”

Section: D Printing Magnetizationmentioning

confidence: 99%

Multi-state, three-way, normally open mini valve based on 3D printed flexible magnets using origami-inspired magnetization

Han,

Lu,

Gong

et al. 2023

Smart Mater. Struct.

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Electromagnetic mini valves for controlling pneumatic soft actuators are attracting widespread interest in recent years. However, it is known that the traditional electromagnetic valves on the millimeter scale generally have three or fewer working states, and their moving parts are usually permanent magnets with a special shape that needs expensive manufacturing. To overcome these problems, this study aims to develop a mini valve with four working states based on flexible magnets at a low fabrication cost. We take full advantage of low-cost 3D-printed magnets’ physical and magnetic properties and improve their performance through origami-inspired magnetization. A fixed-beam-structure flexible magnet is proposed to control this valve via deformation so that valve’s two sides can be driven independently, resulting in four working states. Compared with conventional sintered magnets, 3D printing magnets can be manufactured quickly and affordably. Due to the proposed valves’ more operating states than the state-of-art three-way ones, they are proven to reduce the number of small control elements in the pneumatic system. The maximum flow rate of the valve at 5 kPa air pressure was 0.81 L/min at the power consumption of 20 W. This mini valve has the potential in controlling multi-degree-of-freedom pneumatic soft actuators.

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Wireless Magnetic Robot for Precise Hierarchical Control of Tissue Deformation

Wang,

Zhao,

Han

et al. 2024

Advanced Science

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Mechanotherapy has emerged as a promising treatment for tissue injury. However, existing robots for mechanotherapy are often designed on intuition, lack remote and wireless control, and have limited motion modes. Herein, through topology optimization and hybrid fabrication, wireless magneto‐active soft robots are created that can achieve various modes of programmatic deformations under remote magnetic actuation and apply mechanical forces to tissues in a precise and predictable manner. These soft robots can quickly and wirelessly deform under magnetic actuation and are able to deliver compressing, stretching, shearing, and multimodal forces to the surrounding tissues. The design framework considers the hierarchical tissue‐robot interaction and, therefore, can design customized soft robots for different types of tissues with varied mechanical properties. It is shown that these customized robots with different programmable motions can induce precise deformations of porcine muscle, liver, and heart tissues with excellent durability. The soft robots, the underlying design principles, and the fabrication approach provide a new avenue for developing next‐generation mechanotherapy.

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Theory of hard magnetic soft materials to create magnetoelectricity

Cited by 21 publications

References 92 publications

Enhanced Magnetic Soft Robotics: Integrating Fiber Optics and 3D Printing for Rapid Actuation and Precision Sensing

Enhanced Magnetic Soft Robotics: Integrating Fiber Optics and 3D Printing for Rapid Actuation and Precision Sensing

Multi-state, three-way, normally open mini valve based on 3D printed flexible magnets using origami-inspired magnetization

Wireless Magnetic Robot for Precise Hierarchical Control of Tissue Deformation

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