Highly Stretchable and Conductive MXene‐Encapsulated Liquid Metal Hydrogels for Bioinspired Self‐Sensing Soft Actuators

Advanced Functional Materials, Год журнала: 2023, Номер 34(7)

Опубликована: Ноя. 3, 2023

Abstract Advanced sensation and actuation abilities of various living organisms in nature have inspired researchers to design bioinspired self‐sensing soft actuators. However, the majority conventional actuators primarily possess capabilities while lacking a real‐time sensing signal feedback. Here, promising strategy is reported develop highly stretchable conductive hydrogels for actuators, which integrate strain‐sensing functions into single materials system. The are designed fabricated by situ copolymerization amino‐functionalized MXene‐encapsulated liquid metal nanodroplets (LM@A‐MXene) poly( N ‐isopropylacrylamide) with controllable activated nanogels as nano‐cross‐linkers. resulting hydrogel presents compacted conducting network porous microstructure, giving rise robust integration high conductivity, excellent strain sensitivity, broad stretchability, stability, fast response speed. Interestingly, gradient structure, formed self‐precipitation LM@A‐MXene, endows shape‐programmable actuation, light‐driven remote control, function. As proof‐of‐concept application, gripper based on developed, can not only grasp, lift, release objects, but also perceive every movement state monitoring resistance changes. proposed actuator offer new insights developing smart robotics other artificial intelligent devices.

Язык: Английский

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Sustainable Robots 4D Printing

Advanced Sustainable Systems, Год журнала: 2023, Номер 7(12)

Опубликована: Сен. 1, 2023

Abstract Nature frequently serves as an inspiration for modern robotics innovations that emphasize secure human–machine interaction. However, the advantages of increased automation and digital technology integration conflict with global environmental objectives. Accordingly, biodegradable soft robots have been proposed a range intelligent applications. Biodegradability provides extraordinary functional advantage operations involving shape transformation in response to external stimuli such heat, pH, light. Soft robot fabrication using conventional manufacturing techniques is inflexible, time‐consuming, labor‐intensive. Recent advances 3D 4D printing materials multi‐materials become key enabling direct manufacture complex designs functions. This review comprises detailed survey sensors actuators (BSSA), which serve most prominent parts each robotic system. In addition, concise overview 3D‐printed flexible devices medical along industrial applications provided. A complete summary current additive BSSA discussed depth. Moreover, concept 4D‐printed biohybrid reviewed.

Язык: Английский

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Mechanochromic and ionic conductive cholesteric liquid crystal elastomers for biomechanical monitoring and human–machine interaction

Materials Horizons, Год журнала: 2023, Номер 11(1), С. 217 - 226

Опубликована: Окт. 20, 2023

Ionic conductive cholesteric liquid crystal elastomers with dynamic color-changing and electrical sensing functions were developed through the integration of polymer ionic networks.

Язык: Английский

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Recent Advances in 4D Printing of Advanced Materials and Structures for Functional Applications

Advanced Materials, Год журнала: 2024, Номер 36(34)

Опубликована: Март 5, 2024

4D printing has attracted tremendous worldwide attention during the past decade. This technology enables shape, property, or functionality of printed structures to change with time in response diverse external stimuli, making original static alive. The revolutionary 4D-printing offers remarkable benefits controlling geometric and functional reconfiguration, thereby showcasing immense potential across fields, including biomedical engineering, electronics, robotics, photonics. Here, a comprehensive review latest achievements using various types materials different additive manufacturing techniques is presented. state-of-the-art strategies implemented harnessing 4D-printed are highlighted, which involve design, functionalities, applications. machine learning approach explored for also discussed. Finally, perspectives on current challenges future trends toward further development summarized.

Язык: Английский

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A Dual‐Responsive Liquid Crystal Elastomer for Multi‐Level Encryption and Transient Information Display

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(48)

Опубликована: Окт. 11, 2023

Abstract Information security has gained increasing attention in the past decade, leading to development of advanced materials for anti‐counterfeiting, encryption and instantaneous information display. However, it remains challenging achieve high with simple procedures low‐energy stimuli. Herein, a series strain/temperature‐responsive liquid crystal elastomers (LCEs) are developed dual‐modal, multi‐level real‐time, rewritable transient The as‐prepared polydomain LCEs can change from an opaque state transparent under strain or temperature stimuli, transition strains temperatures highly dependent on concentration long‐chain flexible spacers. encrypted by different LCE inks be decrypted specific temperatures, protection security. Furthermore, combination phase photothermal effect multi‐walled carbon nanotubes (MWCNTs), we achieved repeatable display using near‐infrared (NIR) light as pen writing. This study provides new insight into versatility broad applications.

Язык: Английский

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Shape Morphing of 3D Printed Liquid Crystal Elastomer Structures with Precuts

ACS Applied Polymer Materials, Год журнала: 2023, Номер 5(9), С. 7477 - 7484

Опубликована: Авг. 10, 2023

Liquid crystal elastomer (LCE) is a typical thermally responsive soft material, which an ideal candidate for fabricating programmable shape changing structures. The anisotropic changes of LCEs caused by the mesogen reorientation are inherently different from those other stimulus-responsive materials, such as hydrogels and dielectric elastomers. In this paper, we first investigate bending behaviors bilayer with monodomain active layer polydomain passive layer. It shown that folding can be obtained aspect ratio. We further propose strategy to achieve complex activated LCE deformations through introducing precuts into printed structures, change degrees freedom morphing our design beyond ability based on materials. Our method provide far-reaching possibilities devices 3D actuators various functionalities.

Язык: Английский

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Mechanically Tunable Circularly Polarized Luminescence of Liquid Crystal‐Templated Chiral Perovskite Quantum Dots

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(22)

Опубликована: Март 25, 2024

Abstract Endowing perovskite quantum dots (PQDs) with circularly polarized luminescence (CPL) offers great promise for innovative chiroptical applications, but the existing strategies are inefficient in acquiring stimuli‐responsive flexible chiral films large, tunable dissymmetry factor ( g lum ) and long‐term stability. Here, we report a strategy design synthesis of luminescent cholesteric liquid crystal elastomer (Lumin‐CLCE) mechanically CPL, which is enabled by crystal‐templated self‐assembly situ covalent cross‐linking judiciously designed photopolymerizable CsPbX 3 (X=Cl, Br, I) PQD nanomonomers into elastic polymer networks. The resulting Lumin‐CLCE showcase structural color natural light noticeable CPL maximum value up to 1.5 under UV light. manipulation intensity rotation direction achieved controlling self‐assembled helicoidal nanostructure handedness soft helices. A significant breakthrough lies achievement reversible, perovskite‐based switch activated biaxial stretching, enables flexible, dynamic anti‐counterfeiting labels capable decrypting preset information specific polarization states. This work can provide new insights development advanced materials their emerging applications encryption, 3D displays, beyond.

Язык: Английский

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Chameleon-inspired structural coloration of textiles with non-close-packed photonic crystals for high color saturation and color fastness

Chemical Engineering Journal, Год журнала: 2024, Номер 483, С. 149053 - 149053

Опубликована: Янв. 29, 2024

Язык: Английский

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Bioinspired H‐Bonding Connected Gradient Nanostructure Actuators Based on Cellulose Nanofibrils and Graphene

Small, Год журнала: 2024, Номер unknown

Опубликована: Май 6, 2024

Abstract The construction of flexible actuators with ultra‐fast actuation and robust mechanical properties is crucial for soft robotics smart devices, but still remains a challenge. Inspired by the unique mechanism pinecones dispersing seeds in nature, hygroscopic actuator interlayer network‐bonding connected gradient structure fabricated. Unlike most conventional bilayer designs, strategy leverages biobased polyphenols to construct strong interfacial H‐bonding networks between 1D cellulose nanofibers 2D graphene oxide, endowing materials high tensile strength (172 MPa) excellent toughness (6.64 MJ m −3 ). Furthermore, significant difference hydrophilicity GO rGO, along dense H‐bonding, enables water exchange during absorption desorption processes. resulted exhibits driving speed (154° s −1 ), pressure‐resistant cyclic stability. Taking advantages these benefits, can be fabricated into devices (such as grippers, humidity control switches) potential practical applications. presented approach constructing structures instructive achieving performance functionalization biomass nanomaterials complex 1D/2D nanomaterials.

Язык: Английский

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Wireless Power Transfer to Electrothermal Liquid Crystal Elastomer Actuators

ACS Applied Materials & Interfaces, Год журнала: 2023, Номер 15(22), С. 27195 - 27205

Опубликована: Май 25, 2023

Wireless actuation of electrically driven soft actuators is paramount importance for the development bioinspired robotics without physical connection or on-board batteries. Here, we demonstrate untethered electrothermal liquid crystal elastomer (LCE) based on emerging wireless power transfer (WPT) technology. We first design and fabricate LCE-based that consist an active LCE layer, a conductive metal-filled polyacrylic acid (LM-PA) passive polyimide layer. LM can function not only as transducer to endow resulting with responsiveness but also embedded sensor track resistance changes. Various shape-morphing locomotive modes such directional bending, chiral helical deformation, inchworm-inspired crawling be facilely obtained through appropriately controlling molecular alignment direction monodomain LCEs, reversible shape-deformation behaviors monitored in real-time Interestingly, have been achieved by designing closed circuit within combining it inductive-coupling WPT When actuator approaches commercially available supply system, induced electromotive force generated circuit, which results Joule heating actuation. As proof-of-concept illustrations, wirelessly exhibit programmable are demonstrated. The research disclosed herein provide insights into somatosensory actuators, battery-free robots, beyond.

Язык: Английский

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