Multi‐Level Information Encryption/Decryption of Fluorescent Hydrogels Based on Spatially Programmed Crystal Phases

Lan, Xinyi; Xu, Shanshan; Sun, Chenxuan; Zheng, Ying; Wang, Bao; Shan, Guorong; Bao, Yongzhong; Yu, Chengtao; Pan, Pengju

doi:10.1002/smll.202205960

Cited by 23 publications

(14 citation statements)

References 53 publications

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“…In addition, the micropillars show the potential of two‐level information encryption/decryption. [ 38 ] For example, by setting a two‐level magnetic field in which each level corresponds to a kind of magnetized micropillar with no deformation occurring, the combination between two patterns could be displayed and switched quickly on a single magnetic micropillar array (Figure S9, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Sun,

Zhang,

Zhao

et al. 2023

Adv Materials Technologies

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Magnetic micropillars have shown great promise in various applications including information storage, fluid manipulation, and soft robotics. But to date, magnetic micropillars with reprogrammable magnetization, multi‐modal deformation and functionality, and on‐demand fast actuation have not been reported yet. Herein, locally reprogrammable ferromagnetic micropillars with on‐demand reconfiguration and multi‐functionality are reported. The magnetic micropillars are fabricated by dispersing CrO2 microparticles (diameter ≈5 µm, Curie temperature Tc = 110 °C) in the Ecoflex matrix. The magnetization of each micropillar can be easily programmed and reprogrammed by simultaneously heating the micropillar above Tc via laser and applying a magnetizing field. The magnetization can be programmed as omnidirectional in three dimensions, thus entire magnetic micropillar arrays show a variety of deformation modes (including both synchronous and asynchronous modes) with on‐demand fast actuation by remotely applying magnetic fields. Four representative functionalities of the magnetic micropillars are demonstrated: information encryption, particle pumping, ink mixing, and underwater crawling robot.

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Section: Resultsmentioning

confidence: 99%

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Sun,

Zhang,

Zhao

et al. 2023

Adv Materials Technologies

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“…This bionic multilayer structure is designed for encryption and decryption by solvent substitution and temperature switching. Yu and co-workers proposed an innovative strategy to prepare hydrogels with multilevel information encryption/decryption capability by spatially programming the polycrystalline phases . The homocrystalline (HC) and stereocomplex (SC) crystalline phases in the fluorescent hydrogels were tuned by solvent-assisted diffusion and solvent exchange.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Encoding Strategy of Multi-Stimulus Response Aggregation-Induced Emission Hydrogels for Advanced Information Encryption and Safety

Li,

Xia,

Lin

et al. 2024

ACS Appl. Polym. Mater.

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Optical information encryption is closely related to information security, and smart hydrogels with tunable optical properties under external stimuli have received much attention as optical storage materials. However, it is still challenging to achieve complex information camouflage and large-capacity information storage in hydrogel systems. Herein, a hybrid encoding strategy afforded by an aggregation-induced emission (AIE) fluorescent hydrogel with multi-stimuli responsiveness is pioneered as a feasible alternative for multiple camouflage strategies. More specifically, the photoluminescence intensity of a system can be independently or mutually tuned by specific stimuli, including solvent (DMSO/H 2 O), pH (NaOH/HCl), and metal ions (Fe 3+ / EDTA 2− ), leading to the precise protection or decoding of encrypted information. That is, only the correct stimulus sequence can unlock the stored real information, thus enabling the system with the functionality of multilayer encryption and on-demand decryption of information. We envisage that the present strategy of multiple information carrying and showcasing in AIE hydrogels through stimulation sequence regulation exhibits great potential for secure information writing and anticounterfeit encryption.

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“…[1][2][3][4] Applications of luminescent materials in the fields of anti-counterfeiting technology, optical information storage, and optical information encryption (OIE) have attracted increasing attention due to the multimodality protection mechanisms, including luminescent intensity, emission wavelength, lifetime, and patterns. Outstanding examples have been demonstrated, [5][6][7][8] including fluorescent organic dyes, [9,10] quantum dots (QDs), [11,12] hydrogels, [13][14][15] carbon dot (CDs), [16][17][18] and organic phosphorescent materials. [19][20][21] For instance, Nagarkar et al demonstrated wavelength multiplexing by printing dye molecules with seven different emissions, which could represent eightbit binary numbers at each pixel.…”

Section: Introductionmentioning

confidence: 99%

Double‐Key Optical Information Encryption Enabled by Multi‐State Excitation–Emission of Mn‐Doped Metal Chlorides

Zhao,

et al. 2023

Advanced Optical Materials

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Given the paramount importance of information security and confidentiality, various optical information encryption (OIE) strategies are developed based on luminescence. However, the protected information usually can be decrypted, and there is a lack of high‐level security because only one protection key can be applied. Herein, a double‐key OIE strategy is developed based on multi‐state excitation–emission of Mn‐doped metal chlorides (MMCs). The information delivered by different MMCs can be encrypted based on the similar orange luminescence of Mn d–d transition. The distinguishable excitation conditions, switchable luminescence, and unique afterglow in MMCs enable new encryption mechanisms with a great potential for high confidentiality multi‐key encryption. It is demonstrated that four information channels can be encrypted into a single luminescent pattern, concealing the true information by three interference messages, which greatly increases the security. As a demo, an encrypted quick response (QR) code is created, which can only be decrypted with both the “excitation wavelength key” and “capture time key.” The double‐key mechanism enhances the level of security and confidentiality without using expensive equipment or external stimuli.

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Multi‐Level Information Encryption/Decryption of Fluorescent Hydrogels Based on Spatially Programmed Crystal Phases

Cited by 23 publications

References 53 publications

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Hybrid Encoding Strategy of Multi-Stimulus Response Aggregation-Induced Emission Hydrogels for Advanced Information Encryption and Safety

Double‐Key Optical Information Encryption Enabled by Multi‐State Excitation–Emission of Mn‐Doped Metal Chlorides

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