Bio-inspired shape-morphing actuator with a large stroke at low temperatures

Sim, Hyeon Jun; Noh, Jun Ho; Choi, Changsoon

doi:10.1016/j.snb.2022.133185

Cited by 7 publications

(3 citation statements)

References 30 publications

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“…The output work densities of WS films outperform various biological and synthetic contractile fibers and films (Figure 2g), including skeletal muscle (≈40 kJ m −3 ), [ 41,45 ] hydrogel (15.3 kJ m −3 ), [ 23 ] body‐temperature‐triggered PNIPAm (160 kJ m −3 ), [ 46 ] light‐triggered LCE (≈40–80 kJ m −3 ), [ 22,47 ] chemical‐triggered triblock copolymer [ 48 ] (90 kJ m −3 ) and spider silk [ 49,50 ] (≈500–700 kJ m −3 ). Although some heat‐triggered LCE [ 21 ] and supramolecular polymer [ 51 ] exhibit extremely large output work density (1267.7 kJ m −3 and 2180 kJ m −3 respectively), their high‐temperature stimulus makes them inconvenient for use and incompatible with applications involving the skin.…”

Section: Resultsmentioning

confidence: 99%

Rapid‐Response Water‐Shrink Films with High Output Work Density Based on Polyethylene Oxide and α‐Cyclodextrin for Autonomous Wound Closure

Yi,

Ren,

et al. 2024

Advanced Materials

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Conventional wound closure methods, including sutures and tissue adhesives, present significant challenges for self‐care treatment, particularly in the context of bleeding wounds. Existing stimuli‐responsive contractile materials designed for autonomous wound closure frequently lack sufficient output work density to generate the force needed to bring the wound edges into proximity or necessitate stimuli that are not compatible with the human body. Here, we report semi‐transparent, flexible, and water‐responsive shrinkable films, composed of poly(ethylene oxide) and α‐cyclodextrin. These films exhibit remarkable stability under ambient conditions and demonstrate significant contraction (∼50%) within 6 seconds upon exposure to water, generating substantial contractile stress (up to 6 MPa) and output work density (∼1028 kJ m−3), which is 100 times larger than that of conventional hydrogel and 25 times larger than that of skeletal muscles. Remarkably, upon hydration, these films are capable of lifting objects 10,000 times their own weight. Leveraging this technology, we further developed water‐shrink tapes, which, upon contact with water, effectively constrict human skin and autonomously close bleeding wounds in animal models within 10 seconds. Our work offers a novel approach to skin wound management, showing significant potential for emergency and self‐care scenarios.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Rapid‐Response Water‐Shrink Films with High Output Work Density Based on Polyethylene Oxide and α‐Cyclodextrin for Autonomous Wound Closure

Yi,

Ren,

et al. 2024

Advanced Materials

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“…The most well-known and researched thermo-responsive polymers are poly(N-isopropylacrylamide) (PNIPAM) [23,44,89,90] and its derivatives [91,92]. PNIPAM exhibits reversible phase transitions with an LCST at 32 • C, approximately, close to human physiological temperature [45].…”

Section: Thermo-responsive Polymersmentioning

confidence: 99%

Fibrous Structures: An Overview of Their Responsiveness to External Stimuli towards Intended Application

Ferreira,

Gonçalves,

Antunes

et al. 2024

Polymers

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In recent decades, the interest in responsive fibrous structures has surged, propelling them into diverse applications: from wearable textiles that adapt to their surroundings, to filtration membranes dynamically altering selectivity, these structures showcase remarkable versatility. Various stimuli, including temperature, light, pH, electricity, and chemical compounds, can serve as triggers to unleash physical or chemical changes in response. Processing methodologies such as weaving or knitting using responsive yarns, electrospinning, as well as coating procedures, enable the integration of responsive materials into fibrous structures. They can respond to these stimuli, and comprise shape memory materials, temperature-responsive polymers, chromic materials, phase change materials, photothermal materials, among others. The resulting effects can manifest in a variety of ways, from pore adjustments and altered permeability to shape changing, color changing, and thermal regulation. This review aims to explore the realm of fibrous structures, delving into their responsiveness to external stimuli, with a focus on temperature, light, and pH.

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“…Therefore, the shape morphing of PPy-PNIPAM composite hydrogels can convert to relative resistance changes, which offers potential in soft robots with a self-sensing ability. Furthermore, rigid polymer additives such as nylon spring, 195 and starch 196 have been incorporated with stimuli-responsive hydrogels. Daniel et al reported PNIPAM hydrogel sheets with electric-field-guided latex microspheres.…”

Section: Chemistry Of Conventional Hydrogels and Additive Components ...mentioning

confidence: 99%

3D shape morphing of stimuli-responsive composite hydrogels

Li,

Tang

et al. 2023

Mater. Chem. Front.

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Bio-inspired shape-morphing actuator with a large stroke at low temperatures

Cited by 7 publications

References 30 publications

Rapid‐Response Water‐Shrink Films with High Output Work Density Based on Polyethylene Oxide and α‐Cyclodextrin for Autonomous Wound Closure

Rapid‐Response Water‐Shrink Films with High Output Work Density Based on Polyethylene Oxide and α‐Cyclodextrin for Autonomous Wound Closure

Fibrous Structures: An Overview of Their Responsiveness to External Stimuli towards Intended Application

3D shape morphing of stimuli-responsive composite hydrogels

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