MXene‐Enabled Pneumatic Multiscale Shape Morphing for Adaptive, Programmable and Multimodal Radar‐infrared Compatible Camouflage

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(24)

Published: April 5, 2024

Abstract Achieving radar‐infrared compatible camouflage with dynamic adaptability has been a long‐sought goal, but faces significant challenges owing to the limited dispersion relations of conventional material systems operating in different wavelength ranges. Here, this work proposes concept pneumatic multiscale shape morphing and design periodically arranged unit consisting MXene‐based morphable conductors intake platforms. During gas actuation, conductor transforms centimeter‐scale 2D flat sheets into 3D balloon shapes enhance microwave absorption behavior, also reconfigures micrometer‐scale MXene wrinkles smooth planes combination cavity‐induced low heat transfer minimize infrared (IR) signatures. Through theory‐guided reverse engineering, final matrix shows remarkable frequency tunability (2.64–18.0 GHz), moderate IR emissivity regulation (0.14 at 7–16.5 µm), rapid responsiveness (≈30 ms), wide‐angle operation (>45 ° ), excellent environmental tolerance. Additionally, multiplexed enables over 14 programmable coding sequences that independently alter thermal radiation without compromising radar stealth, allows multimodal switching between three distinct states. The approach may facilitate evolution techniques electromagnetic functional materials toward multispectral, intelligence.

Language: Английский

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Dual‐Mode Hydrogels with Structural and Fluorescent Colors toward Multistage Secure Information Encryption

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(28)

Published: May 14, 2024

Abstract Constructing an anti‐counterfeiting material with non‐interference dual optical modes is effective way to improve information security. However, it remains challenging achieve multistage secure encryption due the limited stimulus responsiveness and color tunability of current dual‐mode materials. Herein, a hydrogel both independently tunable structural fluorescent colors toward encryption, reported. In this system, rigid lamellar structure poly(dodecylglyceryl itaconate) (pDGI) formed by shear flow‐induced self‐assembly provides restricted domains wherein monomers undergo polymerization form network, producing color. The introduction monomer 6‐acrylamidopicolinate (6APA) as complexation site possibility formation. hydrogel's angle‐dependent can be controlled adjusting crosslinking density water content. Additionally, fluorescence modulated ratio lanthanide ions. Information displayed separately in different channels synergistically overlayed read ultimate message. Thus, system based on devised through programed decryption process. This strategy holds tremendous potential platform for encrypting safeguarding valuable authentic field anti‐counterfeiting.

Language: Английский

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From Fluorescence‐Transfer‐Lightening‐Printing‐Assisted Conductive Adhesive Nanocomposite Hydrogels toward Wearable Interactive Optical Information‐Electronic Strain Sensors

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(25)

Published: March 12, 2024

Abstract The interactive flexible device, which monitors the human motion in optical and electrical synergistic modes, has attracted growing attention recently. incorporation of information attribute within signal is deemed advantageous for improving efficiency. Therefore, development wearable information‐electronic strain sensors holds substantial promise, but integrating synergizing various functions realizing strain‐mediated transformation keep challenging. Herein, an amylopectin (AP) modified nanoclay/polyacrylamide‐based nanocomposite (NC) hydrogel aggregation‐induced‐emission‐active ink are fabricated. Through fluorescence‐transfer printing onto film different strains with nested multiple symbolic information, a fluorescent sensor developed. In sensor, nanoclay plays “one‐stone‐three‐birds” role, contributing to “lightening” fluorescence (≈80 times emission intensity enhancement), ionic conductivity, excellent stretchability (>1000%). high biocompatibility, resilience (elastic recovery ratio: 97.8%), sensitivity (gauge factor (GF): 10.9). Additionally, AP endows skin adhesiveness. can achieve monitoring joint movements while displaying transformation. This research poses efficient strategy develop multifunctional materials provides general platform achieving next‐generation devices prospective applications devices, human‐machine interfaces, artificial intelligence.

Language: Английский

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Achieving Bright and Long‐Lived Aqueous Room‐Temperature Phosphorescence of Carbon Nitrogen Dots Through In Situ Host–Guest Binding

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(24)

Published: Feb. 29, 2024

Abstract The development of bright and long‐lived aqueous room‐temperature phosphorescent (RTP) materials holds paramount importance in broadening the application scope RTP material system. However, conventional usually exhibit low efficiency short lifetime solution. Herein, an situ host–guest strategy is proposed to achieve cyanuric acid (CA)‐derived carbon nitrogen dots (CNDs) composite (CNDs@CA) that demonstrates a significant enhancement both quantum yield (QY) mediated by water. Detailed investigations reveal robust hydrogen bonding networks between CNDs@CA water effectively stabilize triplet excitons suppress nonradiative decays, as well facilitate efficient energy transfer from CA CNDs, thereby prolonging enhancing RTP. QY can be increased 26.89% (3.9‐fold increase) 951.25 ms (5.5‐fold increase), respectively, with incorporation 50 wt% under ambient conditions. Even fully environments (with up 400 added), exhibits persistent water‐boosted properties, demonstrating exceptional stability. property solutions presents potential for high signal‐to‐noise ratio afterglow bioimaging advanced information encryption.

Language: Английский

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Assembly‐Induced Dynamic Structural Color in a Host‐Guest System for Time‐Dependent Anticounterfeiting and Double‐Lock Encryption

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(26)

Published: April 10, 2024

Manipulation of periodic micro/nanostructures in polymer film is great importance for academics and industrial applications anticounterfeiting. However, with the increasing demand on information security, materials time-dependent features are urgently required, especially material where same can appear more than once time scale. Here, one concise strategy to realize anticounterfeiting "double-lock" encryption based a host-guest system proposed, photoresponsive azopolymer as host liquid-crystalline molecule guest. The exhibits tunable mass transport pre-designed by tailoring process cis-to-trans recovery azo groups assembly mesogenic trans-isomers, resulting dynamic structural color film. Taking advantage this extraordinary feature, has been achieved. More importantly, each state's appearance whole be modulated changing ratio. Combining manipulatable unique decoding method, stored decrypted correctly. This work provides an unprecedented approach advanced technology higher level security high-end encryption.

Language: Английский

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In situ Light‐Writable Orientation Control in Liquid Crystal Elastomer Film Enabled by Chalcones

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(11)

Published: Jan. 8, 2024

Abstract Liquid crystal elastomers (LCEs) are stimulus‐responsive materials with intrinsic anisotropy. However, it is still challenging to in situ program the mesogen alignment realize three‐dimensional (3D) deformations high‐resolution patterned structures. This work presents a feasible strategy anisotropy of LCEs by using chalcone mesogens that can undergo photoinduced cycloaddition reaction under linear polarized light. It shown controlling polarization director and irradiation region, distribution freestanding LCE film be created, which leads complex reversible 3D shape‐morphing behaviors. The demonstrates an light‐writing method achieve sophisticated topography changes LCEs, has potential applications encryption, sensors, beyond.

Language: Английский

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Multi-stimulus perception and visualization by an intelligent liquid metal-elastomer architecture

Science Advances, Journal Year: 2024, Volume and Issue: 10(21)

Published: May 24, 2024

Multi-stimulus responsive soft materials with integrated functionalities are elementary blocks for building intelligent systems, but their rational design remains challenging. Here, we demonstrate an architecture sensitized by magnetized liquid metal droplets that dispersed in a highly stretchable elastomer network. The supercooled serve as microscopic latent heat reservoirs, and controllable solidification releases localized thermal energy/information flows enabling programmable visualization display. This allows the perception of variety information-encoded contact (mechanical pressing, stretching, torsion) noncontact (magnetic field) stimuli well dynamic phase transition stress evolution processes, via and/or thermochromic imaging. metal-elastomer offers generic platform designing sensing, display, information encryption systems.

Language: Английский

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Liquid Crystal Elastomer Hollow Fibers as Artificial Muscles with Large and Rapid Actuation Enabled by Thermal‐Pneumatic Enhanced Effect

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: June 14, 2024

Abstract Liquid crystal elastomer (LCE) has large and reversible deformation under stimulation, making it an ideal material for artificial muscles. Currently, multi‐stimulus responsive LCE actually responds to each stimulus independently rather than responding several stimuli simultaneously. Achieving enhanced effect from concurrent is still a challenge, which requires new stimulus‐response mechanism. This work develops novel facile solvent evaporation‐assisted template method prepare hollow fiber (LCEHF) with axial alignment. Taking advantage of the heat‐induced phase transition mechanical force‐induced orientation mesogens, LCEHF both heat pressure can produce contraction ratio ≈50%, higher 42% thermal stimulation or 27% pneumatic stimulation. It also enhance respective response recovery speed 300 3700 times actuation. Additionally, lowers actuation temperature much below temperature, imparting high performance during Furthermore, dual thermal‐pneumatic mimic human biceps cause rapid bending arm reversibly. methodology sheds light on improving broadens its application scenarios.

Language: Английский

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PDLC flexible films with multiple fluorescence and voltage modulated modes and intelligent coding for applications in anti-counterfeiting and transparent displays

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 153742 - 153742

Published: July 4, 2024

Language: Английский

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Light-Induced Nontethered Rolling of Liquid Crystal Elastomer and Carbon Nanotube Composite Ring

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(5), P. 2709 - 2718

Published: Feb. 16, 2024

Carbon nanotubes (CNT) can enhance the mechanical and light absorption properties of liquid crystal elastomer (LCE). Different from other ring-shaped LCE works, we proposed a structure using LCE-CNT composite materials that achieve nontethered rolling with assistance its own gravity controlled by light. We demonstrate material lift nearly 200 times weight induced light, cantilever beam made it exhibits remarkable deformations to overcome gravity. Subject radiation, ring effectively converts energy into energy, enabling on flat surfaces, titled over small obstacles. Moreover, finite element method, analyze mechanism investigate effects angle inhomogeneous deformation ring, shift center, generated moment. The results methods in this paper help give reference for design analysis intelligent soft machines.

Language: Английский

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