Flexible Metamaterial Electronics

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(52)

Published: March 24, 2022

Abstract Over the last decade, extensive efforts have been made on utilizing advanced materials and structures to improve properties functionalities of flexible electronics. While conventional ways are approaching their natural limits, a revolutionary strategy, namely metamaterials, is emerging toward engineering structural break existing fetters. Metamaterials exhibit supernatural physical behaviors, in aspects mechanical, optical, thermal, acoustic, electronic that inaccessible materials, such as tunable stiffness or Poisson's ratio, manipulating electromagnetic elastic waves, topological programmable morphability. These salient merits motivate metamaterials brand‐new research direction inspired innovative applications Here, groundbreaking interdisciplinary field first coined “flexible metamaterial electronics,” focusing enhancing innovating electronics via design metamaterials. Herein, latest progress trends this infant reviewed while highlighting potential value. First, brief overview starts with introducing combination Then, developed discussed, self‐adaptive deformability, ultrahigh sensitivity, multidisciplinary functionality, followed by discussion prospects. Finally, challenges opportunities facing advance cutting‐edge summarized.

Language: Английский

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Smart bioadhesives for wound healing and closure

Bioactive Materials, Journal Year: 2022, Volume and Issue: 19, P. 360 - 375

Published: April 26, 2022

The high demand for rapid wound healing has spurred the development of multifunctional and smart bioadhesives with strong bioadhesion, antibacterial effect, real-time sensing, wireless communication, on-demand treatment capabilities. Bioadhesives bio-inspired structures chemicals have shown unprecedented adhesion strengths, as well tunable optical, electrical, bio-dissolvable properties. Accelerated been achieved via directly released growth factors, material or drug-induced host immune responses, delivery curative cells. Most recently, integration biosensing modules units in a closed-loop system yielded bioadhesives, allowing sensing physiological conditions (e.g., pH, temperature, uric acid, glucose, cytokine) iterative feedback drastically enhanced, stage-specific by triggering drug to avoid infection prolonged inflammation. Despite advances burgeoning field, challenges still exist design fabrication integrated systems, particularly chronic wounds, presenting significant opportunities future next-generation materials systems.

Language: Английский

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Metamaterials and Metasurfaces: A Review from the Perspectives of Materials, Mechanisms and Advanced Metadevices

Nanomaterials, Journal Year: 2022, Volume and Issue: 12(6), P. 1027 - 1027

Published: March 21, 2022

Throughout human history, the control of light, electricity and heat has evolved to become cornerstone various innovations developments in electrical electromagnetic technologies. Wireless communications, laser computer technologies have all been achieved by altering way light other energy forms act naturally how manage them a controlled manner. At nanoscale, heat, matured nanostructure fabrication techniques developed last two decades, wide range groundbreaking processes achieved. Photonic crystals, nanolithography, plasmonics phenomena nanoparticle manipulation are main areas where these applied successfully led an emergent material sciences branch known as metamaterials. Metamaterials functional development strategies focused on structures matter itself, which unconventional unique properties through light-and more general picture waves-in widespread Metamaterial's nanostructures precise shape, geometry, size, direction arrangement. Such configurations impacting waves generate novel that difficult or even impossible obtain with natural materials. This review discusses metamaterials metasurfaces from perspectives materials, mechanisms advanced metadevices depth, aim serve solid reference for future works this exciting rapidly emerging topic.

Language: Английский

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4D Printing of Freestanding Liquid Crystal Elastomers via Hybrid Additive Manufacturing

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(39)

Published: Aug. 13, 2022

Liquid crystal elastomers (LCE) are appealing candidates among active materials for 4D printing, due to their reversible, programmable and rapid actuation capabilities. Recent progress has been made on direct ink writing (DIW) or Digital Light Processing (DLP) print LCEs with certain actuation. However, it remains a challenge achieve complicated structures, such as spatial lattices large actuation, the limitation of printing build platform previous layer. Herein, novel method freestanding on-the-fly by using laser-assisted DIW an strain up -40% is proposed. This process further hybridized DLP optional structural removable supports create 3D architectures in one-step additive process. Various objects, including hybrid lattices, tensegrity, actuator tunable stability, LCE can be additively fabricated. The combination DIW-printed functionally DLP-printed supporting structures thus provides new design freedom fabrication capability applications soft robotics, smart metamaterials, wearable devices.

Language: Английский

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Recent Advances in 4D Printing of Liquid Crystal Elastomers

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(23)

Published: Dec. 3, 2022

Liquid crystal elastomers (LCEs) are renowned for their large, reversible, and anisotropic shape change in response to various external stimuli due lightly cross-linked polymer networks with an oriented mesogen direction, thus showing great potential applications robotics, bio-medics, electronics, optics, energy. To fully take advantage of the stimuli-responsive behaviors LCEs, it is preferable achieve a locally controlled alignment into monodomain orientations. In recent years, application 4D printing LCEs opens new doors simultaneously programming 3D geometry, offering more opportunities higher feasibility fabrication 4D-printed LCE objects desirable properties. Here, state-of-the-art advances reviewed, emphasis on both mechanisms applications. First, fundamental properties working principles representative techniques briefly introduced. Then, by advantages over conventional manufacturing methods demonstrated. Finally, perspectives current challenges development trends toward discussed, which may shed light future research directions this field.

Language: Английский

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Roadmap for Additive Manufacturing: Toward Intellectualization and Industrialization

Chinese Journal of Mechanical Engineering Additive Manufacturing Frontiers, Journal Year: 2022, Volume and Issue: 1(1), P. 100014 - 100014

Published: Feb. 16, 2022

With the rapid development of Additive Manufacturing (AM) technology in past 30 years, AM has been shifting from prototyping to advanced manufacturing functional components industry. Intellectualization and industrialization process equipment could be bottlenecks wide industrial applications future, which have highlighted this paper, aiming at describing technological research roadmaps for next 5 10 years. According data flow value chains technologies, state-of-art design methodology, material, & equipment, smart structures, extreme scales environments elaborated respectively. Some suggestions on potential challenges technologies provided each section, would finally establish a critical technical platform future innovation entrepreneurship.

Language: Английский

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Rational Design of Intelligent and Multifunctional Dressing to Promote Acute/Chronic Wound Healing

ACS Applied Bio Materials, Journal Year: 2022, Volume and Issue: 5(9), P. 4055 - 4085

Published: Aug. 18, 2022

Currently, the clinic's treatment of acute/chronic wounds is still unsatisfactory due to lack functional and appropriate wound dressings. Intelligent multifunctional dressings are considered most advanced modalities. It essential design develop with required functions according microenvironment in clinical treatment. This work summarizes characteristics various common wounds, such as acute wound, diabetic burns scalded mucosal ulcers wound. Furthermore, factors transformation from chronic were analyzed. Then we focused on summarizing how researchers fully thoroughly combined complex modern technology ensure usability value dressing, photothermal-sensitive dressings, dressing (pH-sensitive ROS-sensitive osmotic pressure dressings), hemostatic guiding tissue regeneration microneedle 3D/4D printing Finally, revolutionary development transform existing into needs soon possible have carried out a reasonable meaningful outlook.

Language: Английский

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A soft microrobot with highly deformable 3D actuators for climbing and transitioning complex surfaces

Proceedings of the National Academy of Sciences, Journal Year: 2022, Volume and Issue: 119(49)

Published: Nov. 28, 2022

The climbing microrobots have attracted growing attention due to their promising applications in exploration and monitoring of complex, unstructured environments. Soft based on muscle-like actuators could offer excellent flexibility, adaptability, mechanical robustness. Despite the remarkable progress this area, development soft capable flat/curved surfaces transitioning between two different remains elusive, especially open spaces. In study, we address these challenges by developing voltage-driven small-scale with customized 3D configurations active stiffness adjusting. Combination programmed strain distributions liquid crystal elastomers (LCEs) buckling-driven assembly, guided mechanics modeling, allows for voltage-driven, complex 3D-to-3D shape morphing (bending angle > 200°) at millimeter scales (from 1 10 mm), which is unachievable previously. These enable morphable electroadhesive footpads that can conform curved stiffness-variable smart joints allow locomotion gaits a single microrobot. By integrating such deformable body, report multigait, microrobot (length from 6 90 mm, mass 0.2 3 g) diverse shapes (e.g., flat plane, cylinder, wavy surface, wedge-shaped groove, sphere) distinct surfaces. We demonstrate navigate one surface another, recording corresponding ceilings when carrying an integrated microcamera. developed also flip over barrier, survive extreme compression, climb bamboo leaf.

Language: Английский

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Active Materials for Functional Origami

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(9)

Published: April 30, 2023

Abstract In recent decades, origami has been explored to aid in the design of engineering structures. These structures span multiple scales and have demonstrated be used toward various areas such as aerospace, metamaterial, biomedical, robotics, architectural applications. Conventionally, or deployable actuated by hands, motors, pneumatic actuators, which can result heavy bulky On other hand, active materials, reconfigure response external stimulus, eliminate need for mechanical loads actuation systems. Thus, years, materials incorporated with shown promise remote light weight, programmable origami. this review, shape memory polymers (SMPs) alloys (SMAs), hydrogels, liquid crystal elastomers (LCEs), magnetic soft (MSMs), covalent adaptable network (CAN) polymers, their mechanisms, well how they utilized where these are applicable is discussed. Additionally, state‐of‐the‐art fabrication methods construct highlighted. The existing structural modeling strategies origami, constitutive models describe largest challenges future directions research summarized.

Language: Английский

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Double-network hydrogel enhanced by SS31-loaded mesoporous polydopamine nanoparticles: Symphonic collaboration of near-infrared photothermal antibacterial effect and mitochondrial maintenance for full-thickness wound healing in diabetes mellitus

Bioactive Materials, Journal Year: 2023, Volume and Issue: 27, P. 409 - 428

Published: April 21, 2023

Diabetic wound healing has become a serious healthcare challenge. The high-glucose environment leads to persistent bacterial infection and mitochondrial dysfunction, resulting in chronic inflammation, abnormal vascular function, tissue necrosis. To solve these issues, we developed double-network hydrogel, constructed with pluronic F127 diacrylate (F127DA) hyaluronic acid methacrylate (HAMA), enhanced by SS31-loaded mesoporous polydopamine nanoparticles (MPDA NPs). As components, SS31, mitochondria-targeted peptide, maintains reduces reactive oxygen species (ROS) thus regulates macrophage polarization, as well promoting cell proliferation migration, while MPDA NPs not only scavenge ROS exert an anti-bacterial effect photothermal treatment under near-infrared light irradiation, but also control release of SS31 response ROS. This F127DA/HAMA-MPDA@SS31 (FH-M@S) hydrogel characteristics adhesion, superior biocompatibility mechanical properties which can adapt irregular wounds at different body sites provide sustained MPDA@SS31 (M@S) NPs. In addition, diabetic rat full thickness skin defect model, the FH-M@S promoted M2 collagen deposition, neovascularization healing. Therefore, exhibits promising therapeutic potential for regeneration.

Language: Английский

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