Shape Memory Polymers: Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation (Adv. Mater. 4/2020)

Ze, Qiji; Xiao, Kun; Wu, Shu-Pao; Wong, Janet; Montgomery, S. Macrae; Zhang, Rundong; Kovitz, Joshua M.; Yang, Fengyuan; Hu, Qi; Zhao, Ruoyu

doi:10.1002/adma.202070025

Cited by 35 publications

(28 citation statements)

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“…Smart actuators constructed by stimuli-responsive polymers have deformational behaviors such as expansion and bending under specific stimuli such as light, − heat, − electricity, − and pH change. − They have wide application prospects in the fields of shape memory materials, , soft robotics, , artificial muscles, , microfluidics, , and drug delivery ,, and have attracted significant attentions. In the case of polymer hydrogels, it is the different swelling ratios of stimuli-responsive hydrogels under different circumstances that causes the deformational behaviors of the hydrogel actuators. ,, The most common way to achieve the bending of actuators is to construct an anisotropic structure, such as the bilayer structure. ,, For a bilayer hydrogel actuator, the shape change of the entire structure is usually caused by the different expanding/shrinking trends of each layer of the hydrogels under a certain stimulus. ,− Based on this principle, the hydrogel actuators normally exhibit a monotonic responsiveness, that is, there is only one response action after being stimulated once.…”

Section: Introductionmentioning

confidence: 99%

Temporary Actuation of Bilayer Polymer Hydrogels Mediated by the Enzymatic Reaction

Zhang

et al. 2022

Langmuir

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Most soft actuators have the ability of monotonic responsiveness. That is, there is only one response action after being stimulated once. In this work, a temporarily responsive bilayer hydrogel actuator is designed and fabricated by combining a tertiary amine-containing pH-responsive layer and a urease-containing non-responsive layer. The hydrogel actuator can achieve programed deformation and recovery driven by chemical fuels (i.e., acidic urea solutions), which is essentially regulated by rapid acidification and slow enzymatic production of ammonia for recovering the pH of the system. The actuation extent and duration can be simply controlled by the fuel levels, and the repeated actuations are also possible via refueling. Furthermore, we fabricate several hydrogel devices that can display specific patterns or lift an item. This enzymatic method shows new possibilities to control the temporary actuation of polymer hydrogels potentially useful in many fields such as soft robotics, biomimetic devices, and environmental sensing.

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Section: Introductionmentioning

confidence: 99%

Temporary Actuation of Bilayer Polymer Hydrogels Mediated by the Enzymatic Reaction

Zhang

et al. 2022

Langmuir

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“…Stimuli‐responsive materials (SRMs) are materials that can vary their configuration over time upon external stimuli, such as temperature, [ 139–141 ] humidity, [ 142,143 ] light, [ 144–146 ] electricity, [ 147,148 ] and magnetic field. [ 149,150 ] Recently, SRMs have been introduced to TPL, [ 114,151–159 ] and structures with micron and nanoscale feature sizes have been achieved.…”

Section: Methodsmentioning

confidence: 99%

Two‐Photon Polymerization Lithography for Optics and Photonics: Fundamentals, Materials, Technologies, and Applications

Wang

Zhang

Ladika

et al. 2023

Adv Funct Materials

117

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The rapid development of additive manufacturing has fueled a revolution in various research fields and industrial applications. Among the myriad of advanced three-dimensional printing techniques, two-photon polymerization lithography (TPL) uniquely offers a significant electron microscope (SEM) images of SMP structures before and after programming and after recovery, respectively. Reproduced under terms of the CC-BY license. [114] Copyright 2021, The Authors, published by Nature Publishing Group. b) Stiff SMPs for high-resolution reversible nanophotonics. I-II) The deformed and recovered nanopillars under optical microscope and SEM, respectively. Reproduced with permission. [115] Copyright 2022, American Chemical Society. c) Vapor-responsive photonic arrays. I-IV) Optical image of a grid array in air, in water vapors ~ 20 s, saturation with water vapors ~ 88s, and after the gas flow stopped, respectively.Reproduced under terms of the CC-BY license. [116] Copyright 2021, The Authors, published by Royal Society of Chemistry. d) SEM image of a 40-layer face-cantered-cubic photonic structure printed by SU-8. Reproduced with permission. [117] Copyright 2004, Nature Publishing Group. e) SEM image of helices with an axial pitch of 800 nm and a radius of 800 nm fabricated by the two-step absorption photoresist. Reproduced with permission. [118]

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“…4, J and K). In contrast to single-component magnetic selfhealing, which achieves macroscopic assembly of pieces but lacks the precision for microscopic alignment, this work shows that we can simultaneously employ two alignment mechanisms: magnetically guided macroscopic alignment and interfacial-tension mediated microscopic alignment (33)(34)(35)(36).…”

Section: Demonstration Of Functional Healing For Soft Electronicsmentioning

confidence: 97%

Autonomous alignment and healing in multilayer soft electronics using immiscible dynamic polymers

Cooper

Root

Michalek

et al. 2023

Science

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Self-healing soft electronic and robotic devices can, like human skin, recover autonomously from damage. While current devices use a single type of dynamic polymer for all functional layers to ensure strong interlayer adhesion, this approach requires manual layer alignment. In this study, we used two dynamic polymers, which have immiscible backbones but identical dynamic bonds, to maintain interlayer adhesion while enabling autonomous realignment during healing. These dynamic polymers exhibit a weakly interpenetrating and adhesive interface, whose width is tunable. When multilayered polymer films are misaligned after damage, these structures autonomously realign during healing to minimize interfacial free energy. We fabricated devices with conductive, dielectric, and magnetic particles that functionally heal after damage, enabling thin-film pressure sensors, magnetically assembled soft robots, and underwater circuit assembly.

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Shape Memory Polymers: Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation (Adv. Mater. 4/2020)

Cited by 35 publications

References 0 publications

Temporary Actuation of Bilayer Polymer Hydrogels Mediated by the Enzymatic Reaction

Temporary Actuation of Bilayer Polymer Hydrogels Mediated by the Enzymatic Reaction

Two‐Photon Polymerization Lithography for Optics and Photonics: Fundamentals, Materials, Technologies, and Applications

Autonomous alignment and healing in multilayer soft electronics using immiscible dynamic polymers

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