Highly Thermally Conductive Aramid Nanofiber Composite Films with Synchronous Visible/Infrared Camouflages and Information Encryption

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(17)

Published: Feb. 9, 2024

The development of highly thermally conductive composites that combine visible light/infrared camouflage and information encryption has been endowed with great significance in facilitating the application 5G communication technology military fields. This work uses aramid nanofibers (ANF) as matrix, hetero-structured silver nanowires@boron nitride nanosheets (AgNWs@BNNS) prepared by situ growth fillers, which are combined to fabricate sandwich structured electrically insulating (BNNS/ANF)-(AgNWs@BNNS)-(BNNS/ANF) (denoted BAB) composite films "filtration self-assembly, air spraying, hot-pressing" method. When mass ratio AgNWs@BNNS BNNS is 1 : total fraction 50 wt %, BAB film maximum in-plane thermal conductivity coefficient (λ

Language: Английский

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

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(48)

Published: Oct. 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.

Language: Английский

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Stimuli‐responsive fluorescent hydrogels: Strategies and applications

Deleted Journal, Journal Year: 2024, Volume and Issue: 2(1)

Published: Jan. 12, 2024

Abstract Stimuli‐responsive fluorescent hydrogels are three‐dimensional networked polymeric materials with tunable luminescence and dynamic properties, which play an important role as a water‐rich soft material in the fields of information encryption, bionic actuation, bioimaging, environmental monitoring, luminescent materials. Compared conventional hydrogels, their unique properties allow visualization microscopic dynamics within polymer network. By rational inclusion motifs, such photoswitches, AIEgens, lanthanide complexes, host–guest these endowed tunability emission, shape, phase time space response to effectors. In this review, we summarize fabrication strategies that mainly used by recently reported stimuli‐responsive applications

Language: Английский

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Water-dispersible X-ray scintillators enabling coating and blending with polymer materials for multiple applications

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: March 6, 2024

Abstract Developing X-ray scintillators that are water-dispersible, compatible with polymeric matrices, and processable to flexible substrates is an important challenge. Herein, Tb 3+ -doped Na 5 Lu 9 F 32 introduced as scintillating material steady-state light yields of 15,800 photons MeV −1 , which generated nanocrystals on halloysite nanotubes. The obtained product exhibits good water-dispersibility highly sensitive luminescence X-rays. It deposited onto a polyurethane foam afford composite dose-dependent radioluminescence. Moreover, the dispersed into polymer matrixes in aqueous solution prepare rigid or scintillator screen for imaging. As third example, it incorporated multilayer hydrogels information camouflage multilevel encryption. Encrypted can be recognized only by irradiation, while false read out under UV light. Altogether, we demonstrate water-dispersible promising processing radioluminescent, imaging, encrypting materials.

Language: Английский

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Highly Thermally Conductive Aramid Nanofiber Composite Films with Synchronous Visible/Infrared Camouflages and Information Encryption

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(17)

Published: Feb. 9, 2024

Abstract The development of highly thermally conductive composites that combine visible light/infrared camouflage and information encryption has been endowed with great significance in facilitating the application 5G communication technology military fields. This work uses aramid nanofibers (ANF) as matrix, hetero‐structured silver nanowires@boron nitride nanosheets (AgNWs@BNNS) prepared by situ growth fillers, which are combined to fabricate sandwich structured electrically insulating (BNNS/ANF)‐(AgNWs@BNNS)‐(BNNS/ANF) (denoted BAB) composite films “filtration self‐assembly, air spraying, hot‐pressing” method. When mass ratio AgNWs@BNNS BNNS is 1 : total fraction 50 wt %, BAB film maximum in‐plane thermal conductivity coefficient ( λ ∥ 10.36 W/(m ⋅ K)), excellent electrical insulation (breakdown strength volume resistivity 41.5 kV/mm 1.21×10 15 Ω cm, respectively) mechanical properties (tensile 170.9 MPa). % could efficiently reduce equilibrium temperature central processing unit (CPU) working at full power, resulting 7.0 °C lower than CPU solely integrated ANF directly. In addition, boasts adaptive dual on cement roads jungle environments, well function fast QR code within 24 seconds.

Language: Английский

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Multi-mode geometrically gated encryption with 4D morphing hydrogel

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 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

Language: Английский

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Healable Ionic Conductors with Extremely Low‐Hysteresis and High Mechanical Strength Enabled by Hydrophobic Domain‐Locked Reversible Interactions

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(51)

Published: Oct. 11, 2023

Extremely low hysteresis, high mechanical strength, superior toughness, and excellent healability are essential for stretchable ionic conductors to enhance their reliability meet cutting-edge applications. However, the fabrication of with such mutually exclusive properties remains challenging. Herein, extremely low-hysteresis healable a tensile strength ≈8.9 MPa toughness ≈23.2 MJ m-3 fabricated through complexation 4-carboxybenzaldehyde (CBA) grafted poly(vinyl alcohol) (PVA) (denoted as PVA-CBA) poly (allylamine hydrochloride) (PAH) followed by acidification ion-loading steps. The step generates PVA-CBA/PAH in situ formed dynamic hydrophobic domains that lock stabilize noncovalent interactions. This significantly minimizes energy dissipation during cyclic loading (≤200% strain), resulting hysteresis (≈5%). fractured can be healed at 60 °C restore original properties. Because show highly stable reproducible electrical response over 5000 uninterrupted loading-unloading cycles strain 200%. conductor based sensors exhibit sensitivity wide range strains (1-500%).

Language: Английский

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Lignin with enhanced photothermal performance for the preparation of a sustainable solar-driven double-layer biomass evaporator

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 476, P. 146678 - 146678

Published: Oct. 21, 2023

Language: Английский

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Single-actuated and fully recyclable phase change materials enabled multiple thermochromism toward information storage and encryption

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 481, P. 148698 - 148698

Published: Jan. 12, 2024

Language: Английский

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Cholesterol-substituted spiropyran: Photochromism, thermochromism, mechanochromism and its application in time-resolved information encryption

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 665, P. 545 - 553

Published: March 21, 2024

Language: Английский

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