Journal of Materials Chemistry C
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2021
·Vol. 9
·期 46
·16626-16633
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IF 7.393
Yuzhen Wang,Yanan Wang,Chaoyang Ma,Yanbin Li,Chong Zhao,Wanggui Ye,Zicheng Wen,Xuanyi Yuan,Yongge Cao
Bifunctional luminescence materials have aroused considerable concern due to their wide application and high utilization. In this study, we have successfully integrated bright green up-conversion luminescence of K0.5Bi0.5TiO3 (KBT): Er/In ceramics with potential applications on cryogenic optical thermometry and photomemory. By employing the fluorescence intensity ratio based on thermally coupled levels of Er3+: 2H11/2/4S3/2, the splendid low-temperature sensing properties were demonstrated as the maximum relative sensitivities were 7.14% K−1 and 8.73% K−1 at 137 K for KBT: Er and KBT: Er/In ceramics, respectively. Moreover, the reversible photochromism performance could be triggered by the 365 nm irradiation and vanished by thermal stimulation at 150 °C. Remarkably, the coupling of up-conversion luminescence and photochromism performance has a promising application on rewritable photomemory. For the KBT: Er/In ceramic, the emission intensity could be reduced by 76.59% after coloration, and restored to its original value after bleaching. In order to evaluate the practicability of applying on photomemory, a reversible experiment was designed and successfully executed. It is believed that the KBT: Er/In bifunctional ceramic can be a great candidate for low-temperature sensing and optical information storage devices.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Shaofeng Sun,Yan Gao,Na Han,XingXiang Zhang,Wei Li
In this study, reversible photochromic polyurea (PU) microcapsules had been innovatively designed and prepared by in-situ polymerization successfully, which exhibited good latent heat storage and release properties. For the microcapsules, butyl stearate containing photochromic dye (spirooxazine) was used as the core material and PU as the shell material. The surface morphology , melt crystallization, thermal cycling durability, thermal stability and mechanical properties of PU microcapsules were systematically investigated with field emission scanning electron microscope (FE-SEM), different scanning calorimetry (DSC), thermogravimetric (TG) and dynamic mechanical analysis (DMA). And the light-to-thermal conversion performance was studied under sun simulation system. The results showed that the microcapsules synthesized with F2850, a new lipophilic amine, had better morphologies and uniform particle size distribution. When the mass ratio of isophorone diisocyanate (IPDI) to F2850 was 1:2, the surface of the microcapsules was smooth and compact thus resulting in the microcapsules with the highest mechanical strength. In addition, the PU microcapsules exhibited high energy storage efficiency, excellent thermal stability and thermal cyclic durability. Finally, the reversible photochromic microcapsules also presented prominent light-to-thermal conversion properties. What’s more, the temperature of the reversible photochromic microcapsules was nearly 4.9 °C higher than that of microcapsules at the same irradiation time.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2020
·
IF 1.724
Feng Zhou,Xianghong Ren
1,1-Dimethylhydrazine (UDMH) and its by-products were considered carcinogenic toxins and represent a serious health hazard to the population once present in water under natural conditions without treatment. The conventional degradation method suffers from incomplete removal of intermediate products (especially N-nitrosodimethylamine (NDMA)), the powdery catalysis being difficult to recover and results in high energy consumption. In this study, a series of Bi2O3/TiO2/Al2O3 (BTA) photocatalysts have been successfully synthesized by a simple dry mixing method with powder material followed by their immobilization. It was evaluated by the photocatalytic degradation of UDMH present in wastewater, which can be recovered by rapid filtration and utilizes only solar energy. The catalyst exhibited markedly enhanced photocatalytic activity for the degradation of UDMH wastewater compared with conventional TiO2/Al2O3 (TA) catalysts under UV, visible and solar irradiation. Besides, the intermediate NDMA was gradually completely degraded. The photocatalysts were extensively characterized using scanning electron microscopy, energy dispersive spectrometry, specific surface area (BET), X-ray diffraction, X-ray photoelectron spectroscopy, UV–visible diffuse reflectance spectroscopy and photo-electrochemical I–t curves evaluation. The results revealed that all the BTA composites exhibited high stability and stronger absorbance in visible light. In addition, the BTA exhibited a reversible photochromic property that can effectively expand the range of light absorption and enhance the photocatalytic activity. The reversible photochromic properties of BTA explained in the proposed mechanism model are expected to be useful for detecting and sensing UDMH or other organic contaminants.
研究领域:
环境科学
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催化化学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Ning Peng,Jingfang Li,Yumei Hua,Sicong Zhao,Guangming Li
Security printing is of the utmost importance in the information era. However, the excessive use of inks and paper still faces many economic and environmental issues. Thus, developing erasable inkless security printing materials is a remarkable strategy to save resources, protect the environment, and improve information security. To this endeavor, a photoresponsive lanthanide-polyoxometalate-doped gelatin film with high transparency was developed through the solution casting method. Attenuated total reflection Fourier-transform infrared spectroscopy confirmed the electrostatic and hydrogen bond interactions between gelatin and lanthanide-polyoxometalate. Absorption spectra, luminescent spectra, and digital images indicated that the film displayed reversible photochromism behavior and was accompanied by luminescent switching property upon exposure to UV irradiation and oxygen (in the dark) alternately, which allowed its potential application as a reprintable medium for inkless security printing. The printed information can be erased upon exposure to oxygen in the dark, and the film can be reused for printing again. The film exhibited excellent erasability, reprintability, renewability, and low toxicity. In addition, multiple encryption strategies were designed to improve information security. This work offers an attractive alternative strategy for constructing a reprintable film for inkless security printing in terms of simplifying the preparation process, saving resources, and protecting the environment.
研究领域:
材料科学
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光学
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信息加密
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 14
·6386-6396
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IF 3.591
Guangyao Li,Zhicheng Pan,Zhanyu Jia,Juan Wang,Jianlong Wang,Ning Zhang,Mingwang Pan,Jinfeng Yuan
Photochromic hydrogels have attracted widespread attention due to their potential applications in optical devices. Spiropyran (SP) is one of the most investigated organic photochromic compounds and has high sensitivity towards a wide range of stimuli. However, it generally requires sophisticated chemical modification for its incorporation into hydrogels as a functional monomer. In addition, the relatively poor mechanical property is a key limitation with the use of hydrogels in many applications. Herein, we provide an effective approach to directly incorporate the SP photochromic group into a polyurethane hydrogel without any modification. A new type of photochromic polyurethane hydrogel that has excellent photochromic and mechanical properties was successfully prepared. Due to the isomerization reaction of the reversible Cspiro–O bond provided by SP, the hydrogel demonstrated a noticeable and reversible color change on adjusting the SP content. The incorporation of SP significantly improved the mechanical properties of the PU hydrogel; the tensile strength (3.41 MPa) and the high elastic modulus (4.29 MPa) of the PU-SP hydrogel increased 5.4-fold and 9.5-fold, respectively, as compared to the PU hydrogel under the same –NCO to –OH ratio. Moreover, the PU-SP hydrogel has a good reversible photochromic property, which can easily achieve repeated erasing and rewriting. In summary, our present work provides an effective approach to prepare a high-strength and light-responsive photoswitch polyurethane hydrogel through SP without further chemical modification, which may have broad application prospects in wearable soft sensors, erasable optical displays and artificial intelligence systems.
研究领域:
材料科学
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聚合物化学
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光电学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yue Fu,Hu Zhao,Yunming Wang,Dan Chen,Zhaohan Yu,Jiaqi Zheng,Shuang Sun,Weihao Cai,Huamin Zhou
Photonic crystal (PhC) light emitter (PC-LE) devices attract extensive attention in anticounterfeiting for their manipulated light emission and iridescent structural color, but their large-scale three-dimensional fabrication is still limited by poor mechanical strength and microstructural defects. Herein, colloidal nanospheres incorporated with photoluminescent dye were assembled to three-dimensional PC-LE devices through a large-scale compressing-induced strategy, which realized dual iridescent and reversible photochromic colors. Periodically distributed refractive indices between molten molecular chains and cross-linked nanospheres generated the iridescent structural color. Subsequently, the device surface reflected another different structural color after partially removing the surface molecular chains by etching. The light emission intensity of the dye was sufficient to obtain the reversible photochromic colors. Simultaneously, the manipulation toward light emission of the photonic band gap achieved the shape of the photoluminescent intenstiy spectra that varied in accordance with the reflective peak. Furthermore, by use of screen-printing tools and transparent masking glue, the etching process became an inkless color printing process, generating a colorful bar code (2 cm × 2 cm) on the device surface. The code was reversibly displayed and encrypted through control of the reflection and emission of light. Significantly, the PC-LE devices opened up a new route for advanced display, color printing, and anticounterfeiting stickers.
研究领域:
材料科学
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光学
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纳米技术
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光子学
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印刷技术
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安全与防伪
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）