Soft Matter
·
2022
·Vol. 18
·期 11
·2149-2156
·
IF 4.046
Li Xin Hou,Hongyao Ding,Xing Peng Hao,Chao Nan Zhu,Miao Du,Zi Liang Wu,Qiang Zheng
Fluorescent hydrogels have attracted tremendous attention recently in the field of information security due to the booming development of information technology. Along this line, it is highly desired to improve the security level of concealed information by the advancements of materials and encryption technologies. Here we report multi-level encryption of information in a bilayer hydrogel with shape-morphing ability and patterned fluorescence. This hydrogel is composed of a fluorescence layer containing chromophore units in the poly(acrylic acid) network and an active layer with UV-absorption agents in the poly(N-isopropylacrylamide-co-acrylic acid) network. The former layer exhibits tunable fluorescence tailored by UV light irradiation to induce unimer-to-dimer transformation of the chromophores, facilitating the write-in of information through photolithography. The latter layer is responsive to temperature, enabling morphing of the bilayer hydrogel. Therefore, the bilayer hydrogel encoded with patterned fluorescent patterns can deform into three-dimensional configurations at room temperature to conceal the information, which is readable only after successive procedures of shape recovery at an appropriate temperature and under UV light irradiation from the right direction. The combination of morphing materials and patterned fluorescence as a new avenue to improve the encryption level of information should merit the design of other smart materials with integrated functions for specific applications.
研究领域:
材料科学
·
信息安全
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DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 49
·2306003
·
IF 29.4
Jiaxin Yang,Ming Feng,Jingru Wang,Zejia Zhao,Rui Xu,Ziyu Chen,Kang Zhang,Adnan Khan,Yingdong Han,Feng Song,Wei Huang
High-capacity optical data storage and information encryption by using glass substrates are fascinating due to merits of expanding the functionality and applicability of the optoelectronic field. However, the development of glass substrate-based multi-dimensional information encryption methods has remained a challenge because of the high hardness, brittleness and melting temperature of glasses. Herein, inspired by the unique natural structure of plant leaves, multicolor micro-texture-based physical unclonable functions (PUFs) fluorescence glass labels (MTPLs) are exploited by using ultraviolet photocurable silica nanocomposites and soft replication method. It is the first time that simultaneous rare-earth ion (RE 3+ ) space-selective doping and bionic micro-texture replication onto transparent glass have been realized, in which the doping position and fluorescence color of RE 3+ and height information of unclonable micro-texture can be selectively equipped for multilevel information encryption. The prepared micro-scale MTPLs are endowed with tunable multilevel authentication models, including macro-scale multicolor fluorescent 2D patterns, micro-scale pattern, color 3D information and intelligence authentication. A high-performance anti-counterfeiting platform with interactive authentication is also established based on the high robustness and security of MTPLs. Such unclonable bionic MTPLs based on RE 3+ space-selective doping and micro-texture duplication provide an effective and potentially universal approach for multilevel encryption and intelligent authentication.
研究领域:
材料科学
·
光学工程
·
信息安全
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Long Bai,Yong Jin,Xiang Shang,Hongyu Jin,Wenhua Zeng,Liangjie Shi
Despite the current progress in thermo-responsive materials, it is still a significant challenge to develop superior multiple temperature-sensitive ionic conductive hydrogels with programmable regulation capability for interactive wearable iontronics. Here, a dual thermo-responsive ionic conductive hydrogel (DTICH) is constructed based on a salt modulation strategy, which cleverly integrates low-temperature sensitive sodium dodecyl sulfate (SDS) and high-temperature sensitive poly( N -isopropylacrylamide) PNIPAm-based polymer. Owing to the common ion effect and salting-out effect, the resultant DTICH hydrogel visually presents wide and tunable dual temperature response behaviors of 0-18℃ (T k ) and 37-80℃ (LCST) by controlling NaCl concentration for the first time. Meanwhile, benefiting from the synergy of NaCl and thermo-sensitive materials, the hydrogel is concurrently endowed with excellent stretchability (>900 %), adhesion (adhesion strength >30 kPa), frost resisting (-40℃) and multilevel encryption functions. More importantly, the DTICH hydrogel can ingeniously perceive mechanical force and external temperature via the changes of relative resistance and transparency, which can be applied as human–computer interfaces to interactively monitor human motions and temperatures in real time. Therefore, our study establishes a brand new and effective route for the rational design and fabrication of high-level visual interactive devices and smart wearable iontronics.
研究领域:
材料科学
·
生物医学工程
·
智能穿戴设备
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产品关联
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Teng Luo,Ting Zhou,Junle Qu
Asymmetric, multilevel, switchable, and reversible encryption is realized by algorithm encryption, which plays an important role in encryption technology. Fluorescence lifetime encryption is currently not executed by an algorithm. It is well-known that the short fluorescence lifetime (τ1), long fluorescence lifetime (τ2), amplitude-weighted average fluorescence lifetime (τm), and intensity-weighted average fluorescence lifetime (τi) can be obtained using a double exponential fitting, and then these four lifetime parameters can be considered as four lifetime algorithms. Therefore, we propose that the acquisition of these four fluorescence lifetimes can be regarded as further dividing the lifetime by different algorithms and optimizing lifetime multiplexing. Moreover, the four lifetime algorithms of τ1, τm, τ2, and τi can be switched between each other and can be used to perform asymmetric, multilevel, and reversible lifetime encryption to effectively increase the difficulties of anticounterfeiting.
研究领域:
密码学
·
光学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 2
·2308973
·
IF 19
Xiaoxiang Wen,Jinxia Zhang,Jianing Li,Yue Li,Yuchen Shi,Xuegang Lu,Sen Yang,Jing Yu
The escalating need for enhanced cryptographic security necessitates the development of advanced materials designed for the secure storage and transmission of information. Drawing inspiration from the unique color-altering and polarizing capabilities of beetles, this work develops a transparent, thermochromic, and circularly polarized cholesteric phase cellulose composite (CPCC). This is achieved by integrating self-assembled hydroxypropyl cellulose with cholesteric liquid crystal (CLC) structure in tandem with a crosslinked poly(N-isopropyl acrylamide) (PNIPAM) network. The crosslinking density impacts the response degree of thermochromism, which can be regulated by modifying the UV exposure time during PNIPAM production. The CLC structure in CPCC uniquely results in reflected right circularly polarized light. When coupled with waveplates, this mechanism inverts the rotation direction of the reflected light, creating orthogonal structural colors of different brightness levels under left and right circularly polarized light. The excellent transparency of CPCC facilitates seamless integration with the environment, offering optimal camouflage. Sophisticated techniques, such as color coding and Morse coding, can further be incorporated within the CPCC to increase encryption security and the complexity of decryption. Collectively, the CPCC's transparency, thermochromism, and chirality present significant potential in the design and development of materials for high-security information encryption, contributing valuable insights to the field.
研究领域:
材料科学
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光学与光子学
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信息安全
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软物质物理
·
高分子化学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yuke Deng,Yuxiao Zhang,Xinmin Bai,Kan Kan,Shaoyu Ma,Anjun Huang,Jianbei Qiu,Yangke Cun,Yue Liu,Ji Zhou,Zhengwen Yang
A novel self-powered opto-electrically coupled non-pixelated electrochromic device has been presented for dynamic pressure visualization, addressing the limitations of conventional pressure sensors, such as rigid systems, high power consumption, and environmental sensitivity. The device integrates a flexible architecture with a WO 3 @Eu 3 ⁺/Ag nanowires (Ag NWs) composite layer, enabling dual-mode pressure-responsive optical modulation: electrochromism under mechanical pressure and photoluminescence for dark-environment visualization. By leveraging the redox potential difference between, and liquid metal (InSnBi) electrodes, the device achieves self-powered color switching without external energy input. An air gap design isolates the electrolyte and electrochromic layers, ensuring localized pressure-triggered color changes. Experimental results demonstrate a high spatial resolution (200 µm), a broad pressure response range (0–25 N), and stable pattern retention for 30 days. The dual-mode operation, combining pressure-induced electrochromism and rare-earth photoluminescence, enables applications in biometric authentication, dynamic art preservation, and multilevel optical encryption. This work advances flexible sensing technology by merging mechanical and optical biometric features, offering a low-power, environmentally adaptable solution for real-time pressure visualization.
研究领域:
柔性电子学
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光电子器件
·
传感器与执行器
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智能材料
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信息安全
·
生物特征认证
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）