Exploring the Mpemba effect: a universal ice pressing enables porous ceramics

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(8), P. 1899 - 1907

Published: Jan. 1, 2024

A unique technique of “ice and fire” is proposed, that is, manipulation force via water freezing (ice) high-temperature sintering (fire) to fabricate ideal porous ceramics.

Language: Английский

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Monolithic Micro‐/Nanoarchitectonic Multi‐Level Pixel Arrays Via a Two‐Step Photo‐Cross‐Linking Process for Multi‐Modal and Transformative Structural Coloration

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Abstract Thin film‐based structural coloration predominantly uses an elastomeric substrate and active materials, which exhibit uniform color changes under external stimuli such as bending, heat, chemical environments. However, generating distinctive colors in a single stimulation is challenging, especially for microscale pixel arrays, interact more spectral ways than bare thin films or static pixels. This study presents two‐step photo‐cross‐linking fabrication approach monolithic arrays. The pixelated structure devised using ultraviolet‐curable chitosan (UVCC) on polydimethylsiloxane with controlled thickness at the nanoscales. device can generate bending‐based reversible wrinkles different sizes according to of UVCC. Subsequently, each exhibits thickness‐specific covering entire visible spectrum when bent. By coupling four pixels colors, it demonstrated that unit be seen combined eyes. To demonstrate micropixel approach, traditional Korean Dancheong pattern adopted categorized its into three ones. proposed method generates distinguishable between pixels, makes this strong contender pixel‐based applications anti‐counterfeiting, camouflage, security printing.

Language: Английский

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Dynamic multimodal information encryption combining programmable structural coloration and switchable circularly polarized luminescence

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

Published: March 6, 2025

Multimodal optical-materials are highly desirable due to their advantages in enhancing information security, though independent modulation is challenging, especially accurately controlling the orthogonal relationship between structural coloration (SC) and fluorescence (FL) pattern. Herein, we report a strategy which combines programmable switchable circularly polarized luminescence (CPL) for multimodal encryption. Using photomask with aligned grating, periodic patterns fabricated on polydiacetylene (PDA) gel film, produces image tunable colors. Introducing chiral layer containing perovskite nanocrystals twisted-stacking Ag nanowires (NWs) bilayers, provides stimuli-responsive FL CPL high dissymmetry factor (glum, up 1.3). Importantly, (including pattern) can be independently modulated without mutual interference, even selectively concealed or exposed by varying microstructure design of cross-linked PDA acetonitrile treatment.

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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Algorithm in chemistry: molecular logic gate-based data protection

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This review focuses on stimuli-responsive material (SRM)-based data protection, emphasizing the integration of intricate logic and algorithms in SRM-constructed hardware. It also discusses current challenges future directions field.

Language: Английский

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