Research Article

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2021, 14(1): 255–259

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https://doi.org/10.1007/s12274-020-3079-z

Magnetic-programmable organohydrogels with reconfigurable network for mechanical homeostasis

Yingchao Yang1, Qian Liu1, Tianyi Zhao1 (✉), Yunfei Ru1, Ruochen Fang1,2, Yichao Xu1,2, Jin Huang1, and Mingjie Liu1,2,3,4 (✉)

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1 Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China
2 Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, China
3 Research Institute of Frontier Science, Beihang University, Beijing 100191, China
4 International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China

Keywords: magnetic-programmable mechanics, organohydrogels, reconfigurable network, ferrofluid, mechanical homeostasis
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  • Abstract
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Synthetic materials with tunable mechanical properties have great potential in soft robotics and biomedical engineering. However, current materials are limited to the mechanical duality altering their mechanical properties only between soft and hard states and lack of consecutively programmable mechanics. Herein, the magnetic-programmable organohydrogels with heterogeneous dynamic architecture are designed by encasing oleophilic ferrofluid droplets into hydrogel matrix. As magnetic field increases, the mechanical properties of organohydrogels can be consecutively modulated owing to the gradual formation of chain-like assembly structures of nanoparticles. The storage modulus G′ increases by 2.5 times when magnetic field goes up to 0.35 T. Small-Angle X-ray Scattering (SAXS) confirms the reconfigurable orientation of nanoparticles and the organohydrogels show reversible modulus switching. Besides, the materials also exhibit high stretchability, magnetic actuation behavior and effective self-healing capability. Furthermore, the organohydrogels are applied into the design of effectors with mechanical adaptivity. When subjected to serious external perturbations, the effector can maintain mechanical homeostasis by regulating modulus of organohydrogel under applied magnetic field. Such materials are applicable to homeostatic systems with mechanically adaptive behaviors and programmed responses to external force stimuli.
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Magnetic-programmable organohydrogels with reconfigurable network for mechanical homeostasis. Nano Res. 2021, 14(1): 255–259 https://doi.org/10.1007/s12274-020-3079-z

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