Shape memory nanocomposite fibers for untethered high-energy microengines

Yuan, Jinkai; Néri, Wilfrid; Zakri, Cécile; Merzeau, Pascal; Kratz, Karl; Lendlein, Andreas; Poulin, Philippe

doi:10.1126/science.aaw3722

Cited by 180 publications

(94 citation statements)

References 45 publications

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“…Shape programmable soft materials that exhibit integrated multifunctional shape manipulations, including reprogrammable, untethered, fast, and reversible shape transformation and locking, in response to external stimuli, such as heat, light, or magnetic field [1][2][3][4][5] , are highly desirable for a plethora of applications, including soft robotics 6 , actuators [7][8][9] , deployable devices 10,11 , and biomedical devices 6,[12][13][14][15] . A wide range of novel materials have been developed in the past, including liquid crystals elastomers 16,17 , hydrogels 18 , magnetic soft materials 6,19 , and shape memory polymers (SMPs) 1,[20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation

et al. 2019

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Shape-programmable soft materials that exhibit integrated multifunctional shape manipulations, including reprogrammable, untethered, fast, and reversible shape transformation and locking, are highly desirable for a plethora of applications, including soft robotics, morphing structures, and biomedical devices.Despite recent progress, it remains challenging to achieve multiple shape manipulations in one material system. Here, we report a novel magnetic shape memory polymer composite to achieve this. The composite consists of two types of magnetic particles in an amorphous shape memory polymer matrix. The matrix softens via magnetic inductive heating of low-coercivity particles, and highremanence particles with reprogrammable magnetization profiles drive the rapid and reversible shape change under actuation magnetic fields. Once cooled, the actuated shape can be locked. Additionally, varying the particle loadings for heating enables sequential actuation. The integrated multifunctional shape manipulations are further exploited for applications including soft magnetic grippers with large grabbing force, sequential logic for computing, and reconfigurable antennas.

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Section: Introductionmentioning

confidence: 99%

Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation

et al. 2019

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“…We anticipate that the reported magnetic dynamic polymer provides a new paradigm for the design and manufacturing of future multifunctional assemblies and reconfigurable morphing architectures and devices. Shape-morphing materials capable of altering the structural geometry upon external stimuli, such as heat, light, and magnetic field, find diverse applications in actuators, [1,2] soft robots, [3][4][5] flexible electronics, [6][7][8] and biomedical devices. [9][10][11] Various stimuli-responsive smart materials, including shape memory polymers, [12][13][14][15] hydrogel composites, [16][17][18] liquid crystal elastomers, [19,20] and magnetic soft materials (MSMs), [21,22] have been implemented.…”

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confidence: 99%

Magnetic Dynamic Polymers for Modular Assembling and Reconfigurable Morphing Architectures

et al. 2021

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Shape-morphing magnetic soft materials, composed of magnetic particles in a soft polymer matrix, can transform shape reversibly, remotely, and rapidly, finding diverse applications in actuators, soft robotics, and biomedical devices. To achieve on-demand and sophisticated shape morphing, the manufacture of structures with complex geometry and magnetization distribution is highly desired. Here, a magnetic dynamic polymer (MDP) composite composed of hard-magnetic microparticles in a dynamic polymer network with thermally responsive reversible linkages, which permits functionalities including targeted welding for magnetic-assisted assembly, magnetization reprogramming, and permanent structural reconfiguration, is reported. These functions not only provide highly desirable structural and material programmability and reprogrammability but also enable the manufacturing of functional soft architected materials such as 3D kirigami with complex magnetization distribution. The welding of magnetic-assisted modular assembly can be further combined with magnetization reprogramming and permanent reshaping capabilities for programmable and reconfigurable architectures and morphing structures. The reported MDP are anticipated to provide a new paradigm for the design and manufacture of future multifunctional assemblies and reconfigurable morphing architectures and devices.

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“…Second, Fe 3 O 4 nanoparticles enabled the magneto-thermal effect, making it possible to wirelessly actuate the muscle by an RF-magnetic field (note that Fe 3 O 4 nanoparticles themselves also played a role in toughening the muscle) ( 27 ). Third, GO platelets, because of their unique two-dimensional (2D) geometry, substantially aided the fiber strain energy storage, especially in the case of being twisted, much more than that of nanoparticles or carbon nanotubes as toughening agents ( 17 ). Here, we introduced the GO platelets into the active layer (which is located near the outermost surface) because the expansion force was more effective when they were acting near the margin of the yarn (fig.…”

Section: Resultsmentioning

confidence: 99%

Miniature coiled artificial muscle for wireless soft medical devices

Tang

Soon

et al. 2022

Sci. Adv.

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Wireless small-scale soft-bodied devices are capable of precise operation inside confined internal spaces, enabling various minimally invasive medical applications. However, such potential is constrained by the small output force and low work capacity of the current miniature soft actuators. To address this challenge, we report a small-scale soft actuator that harnesses the synergetic interactions between the coiled artificial muscle and radio frequency–magnetic heating. This wirelessly controlled actuator exhibits a large output force (~3.1 N) and high work capacity (3.5 J/g). Combining this actuator with different mechanical designs, its tensile and torsional behaviors can be engineered into different functional devices, such as a suture device, a pair of scissors, a driller, and a clamper. In addition, by assuming a spatially varying magnetization profile, a multilinked coiled muscle can have both magnetic field–induced bending and high contractile force. Such an approach could be used in various future untethered miniature medical devices.

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Shape memory nanocomposite fibers for untethered high-energy microengines

Cited by 180 publications

References 45 publications

Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation

Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation

Magnetic Dynamic Polymers for Modular Assembling and Reconfigurable Morphing Architectures

Miniature coiled artificial muscle for wireless soft medical devices

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