Shape Memory Ankle–Foot Orthoses

Chen, Jianming; Hu, Jinlian; Leung, Aaron Kam-Lun; Chen, Cheng; Zhang, Jun; Zhang, Yuanchi; Zhu, Yaofeng; Han, Jonghee

doi:10.1021/acsami.8b08851

Cited by 20 publications

(21 citation statements)

References 36 publications

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“…For the realization of wearable electronics, an important trend in the last years has been incorporating electroactive nanomaterials with commercial textiles . Many pioneer works has shown that is possible to modify such textiles and its applications span over a wide range of fields, including wearable supercapacitors, electrical sensors, health monitoring devices, energy storage and conversion devices, artificial intelligence, smart textiles, and numerous others . In terms of electroactive materials, polypyrrole, gold nanowires, carbon nanotubes graphene, carbon‐based materials have been supposed to be the good candidates for fabrication of wearable electronic textiles owing to its lightness, excellent mechanical properties, and high conductivity.…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Coated Silk Fabrics with Conductive Property for Wearable Electronic Textiles Application

Liu

Cheng

et al. 2019

Adv Elect Materials

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The desire for this lightweight and flexible electronics has grown increasingly, and the flexible and wearable electronic textiles can be realized by coating traditional textiles with conductive materials. Here, the conductive silk fabrics are prepared by coating graphene oxide (GO) onto silk fabrics and followed by thermal reduction. The scanning electron microscope results show that the GO coated onto silk fabrics successfully forms a continuous thin film. The oxygen functional groups are removed by thermal reduction. The main structure (β‐sheet structure) of silk fabrics is not destroyed through a series of treatment, guaranteeing good mechanical properties. The resistivity and conductivity of silk fabrics using regenerated silk fibroin as a glue can reach 3.28 KΩ cm−1, 3.06 × 10−4 S cm−1 respectively, which can meet the electron conductive requirement of wearable electronics. Thus, it can be used for sensors, portable devices, and wearable electronic textiles.

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Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Coated Silk Fabrics with Conductive Property for Wearable Electronic Textiles Application

Liu

Cheng

et al. 2019

Adv Elect Materials

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“…The first‐level micropillars are primarily hexagon with diameter, height and channel width of about 10, 5, and 0.5 µm (Figure 1b,c). [ 26 ] The second‐level hexagonal nanopillars have a diameter of ≈250 nm (Figure 1d,e), and nanoscale cavity with depth of ≈20 nm is on top (Figure 1f). Inspired by tree frog's structural features, various bioinspired pillar surfaces have been fabricated with polydimethylsiloxane (PDMS) to study the interfacial liquid behavior and its effects, including single‐level pillar surface, hierarchical pillar surface and hierarchical concave pillar surface (Figure 1h,i; Figures S1 and S2 and Table S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Micro–Nano Hierarchical Structure Enhanced Strong Wet Friction Surface Inspired by Tree Frogs

et al. 2020

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Superior wet attachment and friction performance without the need of special external or preloaded normal force, similar to the tree frog's toe pad, is highly essential for biomedical engineering, wearable flexible electronics, etc. Although various pillar surfaces are proposed to enhance wet adhesion or friction, their mechanisms remain on micropillar arrays to extrude interfacial liquid via an external force. Here, two-level micropillar arrays with nanocavities on top are discovered on the toe pads of a tree frog, and they exhibit strong boundary friction ≈20 times higher than dry and wet friction without the need of a special external or preloaded normal force. Microscale in situ observations show that the specific micro-nano hierarchical pillars in turn trigger three-level liquid adjusting phenomena, including two-level liquid self-splitting and liquid self-sucking effects. Under these effects, uniform nanometer-thick liquid bridges form spontaneously on all pillars to generate strong boundary friction, which can be ≈2 times higher than for single-level pillar surfaces and ≈3.5 times higher than for smooth surfaces. Finally, theoretical models of boundary friction in terms of self-splitting and self-sucking are built to reveal the importance of liquid behavior induced by micro-nano hierarchical structure.

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“…[ 98 ] incorporated cellulose nanowhiskers into the PU network, with both temperature and water applied to trigger shape recovery of the copolymer. Chen and co‐workers [ 254 ] designed a smart orthopedic system that was expected to drop foot therapy. Here, a conductive acrylate‐based copolymer was fabricated with silver coating nylon yarns by full Milano stitching.…”

Section: Recent Advances In Applications Of Smps and Smpcsmentioning

confidence: 99%

A Review of Shape Memory Polymers and Composites: Mechanisms, Materials, and Applications

et al. 2020

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Over the past decades, interest in shape memory polymers (SMPs) has persisted, and immense efforts have been dedicated to developing SMPs and their multifunctional composites. As a class of stimuli‐responsive polymers, SMPs can return to their initial shape from a programmed temporary shape under external stimuli, such as light, heat, magnetism, and electricity. The introduction of functional materials and nanostructures results in shape memory polymer composites (SMPCs) with large recoverable deformation, enhanced mechanical properties, and controllable remote actuation. Because of these unique features, SMPCs have a broad application prospect in many fields covering aerospace engineering, biomedical devices, flexible electronics, soft robotics, shape memory arrays, and 4D printing. Herein, a comprehensive analysis of the shape recovery mechanisms, multifunctionality, applications, and recent advances in SMPs and SMPCs is presented. Specifically, the combination of functional, reversible, multiple, and controllable shape recovery processes is discussed. Further, established products from such materials are highlighted. Finally, potential directions for the future advancement of SMPs are proposed.

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Shape Memory Ankle–Foot Orthoses

Cited by 20 publications

References 36 publications

Reduced Graphene Oxide Coated Silk Fabrics with Conductive Property for Wearable Electronic Textiles Application

Reduced Graphene Oxide Coated Silk Fabrics with Conductive Property for Wearable Electronic Textiles Application

Micro–Nano Hierarchical Structure Enhanced Strong Wet Friction Surface Inspired by Tree Frogs

A Review of Shape Memory Polymers and Composites: Mechanisms, Materials, and Applications

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