Stimuli‐responsive photonic actuators for integrated biomimetic and intelligent systems

Deleted Journal, Год журнала: 2023, Номер 1(1)

Опубликована: Июль 27, 2023

Abstract Photonic actuators, serving as an emerging kind of intelligent stimuli‐responsive material, can exhibit the abilities to change their structural colors/fluorescence and shapes under specific external stimuli, which have demonstrated essential applications in fields soft robotics, sensors, bionics, information storage, anti‐counterfeiting, energy harvesting. In this review, we reported state‐of‐the‐art research progress photonic actuators classified on basis material type focusing actuation mechanisms, design principles, processing techniques. We also broadly summarized relative robots, so on. Finally, a vision for challenges area future promising directions is presented.

Язык: Английский

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Swelling-Activated, Soft Mechanochemistry in Polymer Materials

Langmuir, Год журнала: 2023, Номер 39(10), С. 3546 - 3557

Опубликована: Фев. 27, 2023

Swelling in polymer materials is a ubiquitous phenomenon. At molecular level, swelling dictated by solvent-polymer interactions, and has been thoroughly studied both theoretically experimentally. Favorable interactions result the solvation of chains. For polymers confined geometries, such as those that are tethered to surfaces, or for networks, can lead swelling-induced tensions. These tensions act on chains stretching, bending, deformation material at micro- macroscopic scale. This Invited Feature Article sheds light mechanochemical phenomena across dimensions, discusses approaches visualize characterize these effects.

Язык: Английский

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Mechanically Ultra‐Robust, Elastic, Conductive, and Multifunctional Hybrid Hydrogel for a Triboelectric Nanogenerator and Flexible/Wearable Sensor

Small, Год журнала: 2022, Номер 18(47)

Опубликована: Окт. 13, 2022

Abstract Flexibility/wearable electronics such as strain/pressure sensors in human–machine interactions (HMI) are highly developed nowadays. However, challenges remain because of the lack flexibility, fatigue resistance, and versatility, leading to mechanical damage device materials during practical applications. In this work, a triple‐network conductive hydrogel is fabricated by combining 2D Ti 3 C 2 T x nanosheets with two kinds 1D polymer chains, polyacrylamide, polyvinyl alcohol. The act crosslinkers, which combine chains PAM PVA via hydrogen bonds. Such unique structure endows (MPP‐hydrogel) merits ultra‐robust, super‐elasticity, excellent resistance. More importantly, introduced not only enhance hydrogel's conductivity but help form double electric layers (DELs) between MXene free water molecules inside MPP‐hydrogel. When MPP‐hydrogel used electrode triboelectric nanogenerator (MPP‐TENG), due dynamic balance DELs under initial potential difference generated from contact electrification driving force, an enhanced electrical output TENG generated. Moreover, flexible for tiny low‐frequency human motion detection achieved. This work demonstrates promising electronic material e‐skin HMI.

Язык: Английский

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Bio-inspired anisotropic hydrogels and their applications in soft actuators and robots

Matter, Год журнала: 2023, Номер 6(11), С. 3803 - 3837

Опубликована: Сен. 7, 2023

Язык: Английский

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Biomimetic Multiscale Oriented PVA/NRL Hydrogel Enabled Multistimulus Responsive and Smart Shape Memory Actuator

Small, Год журнала: 2024, Номер 20(25)

Опубликована: Фев. 1, 2024

Abstract Shape memory hydrogels provide a worldwide scope for functional soft materials. However, most shape exhibit poor mechanical properties, leading to low actuation strength, which severely limits their applications in smart biomimetic devices. Herein, strategy muscle‐inspired memory‐oriented polyvinyl alcohol (PVA)‐natural rubber latex (NRL) hydrogel (OPNH) with multiscale oriented structure is demonstrated. The function comes from the stretch‐induced crystallization of natural (NR), while PVA forms strong hydrogen bonding interactions proteins and phospholipids on surface NRL particles. Meanwhile, reconfigurable NR produce multiscale‐oriented during stretch‐drying, improving properties. resultant OPNH shows excellent interfacial compatibility, exhibiting outstanding performance (3.2 MPa), high fixity (≈80%) recovery ratio (≈92%), strength (206 kPa), working capacity (105 kJ m − 3 ), extremely short response time (≈2 s), temperature (28 °C) thermal responsiveness. It can even maintain muscle‐like when lifting load equivalent 372 times its weight, providing new class material application muscles multistimulus responsive

Язык: Английский

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Cephalopod‐Inspired Chemical‐Gated Hydrogel Actuation Systems for Information 3D‐Encoding Display

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Март 27, 2024

Cephalopods evolve the acetylcholine-gated actuation control function of their skin muscles, which enables dynamic/static multimode display capacities for achieving perfectly spatial over colors/patterns on every inch skin. Reproduction artificial analogs that exhibit similar multimodal is essential to reach advanced information three-dimensional (3D) encoding with higher security than classic 2D-encoding strategy, but remains underdeveloped. The core difficulty how replicate such chemical-gated into soft actuating systems. Herein, this work proposes develop azobenzene-functionalized poly(acrylamide) (PAAm) hydrogel systems, whose upper critical solution temperature (UCST) type responsiveness can be intelligently programmed or even gated by addition hydrophilic α-cyclodextrin (α-CD) molecules reversible association pendant azobenzene moieties via supramolecular host-guest interactions. By employing α-CD-gated actuator as an analogue cephalopods' muscle, biomimetic mechanically modulated multicolor fluorescent systems are designed, demonstrate a conceptually new "thermal stimulation-hydrogel actuation-fluorescence output" mechanism. Consequently, high-security 3D-encoding carriers unprecedented combination single-input multiple-output, dual-mode and spatially controlled achieved. This bioinspired strategy brings functional-integrated features opens previously unidentified avenues security.

Язык: Английский

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Multi-mode geometrically gated encryption with 4D morphing hydrogel

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Март 22, 2025

Leveraging the rich stimuli-response of polymers represents a promising direction towards optical communication/encryption. Sign language, which relies on specific geometric change for secured communication, has been widely used same purpose since ancient time. We report strategy that combines both in validated manner with hydrogel not only carries encrypted information but also hidden behavior to morph geometrically. In particular, shape morphing is programmable by controlling oriented state polymer chain thermo-responsive network. Whether positive (bending) or negative (flattening) cannot be predicted when polymerization methods are informed, revealing manner. Through deciphering coupling elastic stresses and thermo-induced deswelling stress, can perform designed diversified 4D evolution 3D geometries time as fourth dimension. Consequently, corresponding gated based these features, thereby decrypting correct permutation information. Our approach utilizes verification offers enhancing security communication ways quite different from existing strategies. Stimuli responsive hydrogels always complex required. Here, authors use

Язык: Английский

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Multidimensional‐Encryption in Emissive Liquid Crystal Elastomers through Synergistic Usage of Photorewritable Fluorescent Patterning and Reconfigurable 3D Shaping

Advanced Functional Materials, Год журнала: 2021, Номер 32(4)

Опубликована: Окт. 11, 2021

Abstract Advanced encryption/decryption strategies are of great significance for information protection and data security. It is highly desirable yet quite challenging to develop functional materials encrypting/decrypting more effectively. Herein, a novel emissive liquid crystal elastomer (LCE) multidimensional multistage encryption proposed the first time, through synergistic utilization phototunable fluorescence photoprogrammable shape. The fluorescent LCE fabricated by incorporating an aggregation‐induced‐emission α‐cyanodiarylethene‐based hydrogen‐bonded complex azobenzene derivative into networks covalent bonding. Because photoisomerization both these two photosensitive derivatives under same exciting light, consequent films exhibit photoinduced reversible changes shape deformations that suitable storage encryption. On this basis, collaborative usage photolithography‐based 2D images photoprogramming 3D configurations can lead Moreover, strategy reprogrammable, allowing repeatable encoding decrypting. results demonstrated here reveal promising applications in

Язык: Английский

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Stiffness Variable Polymers Comprising Phase‐Changing Side‐Chains: Material Syntheses and Application Explorations

Advanced Materials, Год журнала: 2022, Номер 34(21)

Опубликована: Фев. 4, 2022

Stiffness variable materials have been applied in a variety of engineering fields that require adaptation, automatic modulation, and morphing because their unique property to switch between rigid, load-bearing state soft, compliant state. polymers comprising phase-changing side-chains (s-SVPs) densely grafted, highly crystallizable long alkyl crosslinked network. Such bottlebrush network-like structure gives rise rigidity modulation as result the reversible crystallization melting side chains. The corresponding modulus changes can be more than 1000-fold within narrow temperature span, from ≈102 MPa kPa or lower. Other important properties s-SVP, such stretchability, optical transmittance, adhesion, also altered. This work reviews underlying molecular mechanisms s-SVP's, discusses material's structure-property relationship, summarizes applications explored so far, including shape transformation, bistable electromechanical transduction, adhesion.

Язык: Английский

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Programming Shape Memory Hydrogel to a Pre‐Encoded Static Deformation toward Hierarchical Morphological Information Encryption

Advanced Functional Materials, Год журнала: 2022, Номер 32(45)

Опубликована: Авг. 5, 2022

Abstract Morphological information encryption such as gesture and sign language is a traditional but efficient way of storage communication. However, due to the limited deformability, almost all existing materials store deliver via pattern or color changes on 2D plane. Herein, thermo ion dual‐responsive shape memory hydrogel containing short alkyl chains modified polyvinyl alcohol (PVA‐C6) polyacrylamide‐co‐polyacrylic acid [P(AAm‐co‐AAc)], prepared. In this system, ion‐responsive process P(AAm‐co‐AAc) provides preprogrammed morphological actuating force while thermo‐responsive hydrophobic clusters PVA‐C6 are utilized molecular switch control deformed posture within deformation process. Incorporated with photothermal particle, Fe 3 O 4 , capable generating diverse configurations that can be encoded corresponding information. With assistance programmable NIR, transfer configuration decrypt Besides, obtained also erased by immersing in hot water, order avoid leakage This study motivates design fabrication deformable new insight into encrypt materials.

Язык: Английский

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