CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Ying Qi,Shaojian Lin,Jianwu Lan,Yifei Zhan,Junling Guo,Jiaojiao Shang
A transparent versatile cellulose platform film was prepared from Eucalyptus pulp in this work. Based on such cellulose platform, multifunctional cellulose films with ultraviolet-shielding, photochromism, and strong mechanical strength were fabricated via nucleophilic postmodification strategy by introducing a versatile spiropyran moiety into cellulose molecules. The fabricated cellulose films exhibited super-high transmittance up to 96% and performed notable ultraviolet-shielding capacity at 200–400 nm. Moreover, the photochromic performance of cellulose films with color changes could be clearly observed by the naked eyes, and the fluorescent blue could be excited. Besides, the tensile stress of multi-functional cellulose film was about 80 MPa, which was almost 8 times stronger than that of the commercial polyethylene film at the same thickness. It is noteworthy that these superior performances promote such a cellulose platform to be a versatile precursor for fabricating various multi-functional cellulose used in the fields of out-door coating, transparent packaging, optical screen, etc .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Zhuo Zhang,Luxuan Guo,Xiaolai Zhang,Jingcheng Hao
Hypothesis The color-changing ability of creatures widely existed in nature has inspired the development of adaptive allochroic materials, which can respond to various external stimuli. Integrating multi-stimuli responsiveness and long-term stability in allochroic system are urgent for practical applications under complex circumstances. Experiments The photochromic/thermotropic organohydrogels (PTOs) comprised polyacrylamide and cationic cellulose (JR400) were prepared by facile free-radical polymerization and glycerol displacement. The coexisting covalent bonds and noncovalent interactions collaboratively reinforce the networks, endowing the PTOs with boosted stretchability and toughness. Findings The photochromic ammonium molybdate (Mo 7 ) and thermo-sensitive poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (EPE) were made into networks. In these cooperative networks, each constituent performed their own function without disruption, including fast photochromism (10 s) and durable thermo-responsiveness. Importantly, the glycerol-water solvent bestowed the distinct anti-freezing (-30 °C) and anti-dehydration performances on the PTOs. Accordingly, the materials could serve as promising rewritable devices for high-resolution and long-term data storage/encryption. Moreover, on-demand PTO windows integrating UV-prevention and solar energy regulation with T lum (92.96%) and ΔT sol (46.02%) could create comfortable and healthy environments for occupants. This work offers a new design strategy for low-cost, environmentally stable smart optical devices .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 28
·7619-7625
·
IF 5.976
Yongqi Yang,Lin Guan,Haicheng Jiang,Lijie Duan,Guanghui Gao
Ink-free printing based on photochromism has attracted great attention as a new generation of printing technology. However, the current photochromic materials are limited due to slow response and high cost. In this investigation, a rapidly responsive photochromic hydrogel with high mechanical strength was explored through the introduction of cheap ammonium molybdate into gelatin and hydrophobic associative polyacrylamide. The photochromic hydrogel exhibited excellent mechanical strength of 750 kPa and a rapidly responsive photochromic process of 5 seconds with UV light irradiation. Moreover, the hydrogel could withstand long elongation and high compressive stress with shape recovery ability. The rapid photochromic properties gave hydrogels with fast and easy “printing” performance. More importantly, the “printed” text or pattern in hydrogels could be erased at 70 °C in an oxygen environment. In addition, the hydrogel could be written on in characters by using reducing reagents. Photochromic hydrogels with ink-free printing ability would demonstrate a new design strategy for soft materials with low-cost, rapid response and high mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HETEROCYCLIC CHEMISTRY
·
2015
·Vol. 53
·期 1
·109-116
·
IF 0.787
Tiesheng Hu,Zhipeng Li,Tingting Wang,Heping Zeng
Four new diarylethene derivatives based on thiophene or thiazole moieties were designed and synthesized, and the structures of compounds 4a and 5a were determined by single-X-ray diffraction analysis. All of these compounds showed reversible photochromic reactions and notable fluorescence photo-switches in solution. Furthermore, diarylethenes 4a and 5a also showed good photochromism in single crystal phase. The electron-donating and electron-withdrawing substituents play the same role in the photochromic process: red-shifted absorption and fluorescence ( 1a and 2a compared with 3a ). The fluorescent modulation efficiencies of asymmetrical diarylethenes 4 and 5 were significantly enhanced compared with the similar dithienylethenes, and the fatigue resistance of 5 was much better than 4 , which showed that the diarylethene bearing electron-withdrawing group could improve its fatigue resistance.
研究领域:
有机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Huateng Li,Guowei Zhao,Mengjing Zhu,Jia Guo,Changchun Wang
Photochromic materials are widely investigated due to their vivid color transformation for many real applications. In this work, a new kind of multiangle photochromic photonic crystal (PC) material with high robustness and long durability for smart phone decoration and anticounterfeiting features is fabricated. After thermal mixing of spiropyran powder and monodisperse core-interlayer-shell (CIS) particles, a large-area and high-quality photochromic PC film has been prepared by the self-designed bending-induced ordering technique (BIOT). The spiropyran powder can be well dispersed in the order-structured PC system, so the perfect synergistic combination of photochromism and angle-dependent structure colors can be achieved. The color-switching test for the as-prepared photochromic PC film proved its excellent reversibility and stability. Because of the excellent flexibility of the photo-cross-linked PC films, they can be designed and cut into various shapes with high robustness and long durability. Interestingly, a temperature-controlled photochromic effect was found in this photochromic PC system. Therefore, the as-prepared photochromic PC films can play a significant role in the fields of smart decoration and anticounterfeiting by their unique color switching effects under different stimuli. More importantly, our work verified the feasibility of this route to prepare a series of large-sized advanced smart PC devices by adding versatile functional materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 3
·2100778
·
IF 4.402
Xiaofei Wang,Yang He,Jinsong Leng
The combination of shape memory effects and multi-functionalities in smart materials is becoming one of the hottest research directions in the field of actuators and robotics. In this study, N -hydroxyethyl-3,3-dimethyl-6-nitroindoline spiropyran (SP) is chemically grafted into a polyurethane matrix to prepare ultraviolet light-actuated shape memory thermoplastic polyurethane, which first integrates three unique properties including shape memory, photochromism, and mechanochromism. The FTIR, WAXD, SAXS, DSC, TGA, and shape memory tests reveal that the shape memory transformation temperature of 4.6 wt% SP-based shape memory polyurethane is 41.2 °C, and it has the highest shape memory performance, as indicated by shape fixation and shape recovery ratios of 97.4% and 93.7%, respectively. Furthermore, “bionic fingers” with diversely selective actuation properties are fabricated, which exhibit a series of programmable multi-segment motions to meet potential applications in the field of soft actuators.
研究领域:
材料科学
·
智能材料
·
机器人学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Xide Chang,Xu Dong,Xianhua Liu,Yindong Tong,Kaixiang Li,Zhenguo Li,Yiren Lu
Mixed-phase composites with an optimal phase ratio show greater light utilization than their monophasic counterparts. This approach can be applied to develop mixed-phase photochromic tungsten oxide (WO 3 ), which shows a rapid photoresponse and high-contrast coloring. Therefore, this paper optimized the phase ratio of hexagonal WO 3 ( h -WO 3 ·0.33H 2 O) and orthorhombic WO 3 ·H 2 O ( o -WO 3 ·H 2 O) to form a homojunction. To enhance its photochromism, nanostructured WO 3 was produced via a one-step hydrothermal strategy, in which its phase structure and morphology were controlled by regulating the reaction temperature during precursor synthesis. Various material characterization techniques were carried out to reveal the complex crystal nucleation and growth of phase junctions. h -WO 3 ·0.33H 2 O nanoparticles dominated the systems, while o -WO 3 ·H 2 O nanoblocks also appeared from 41.77 wt% to 56.50 wt% at a low hydrothermal synthesis temperature, producing a mixture of both polymorphs. The improved photochromic properties (from light yellow to black-green) of the mixed-phase WO 3 composite compared with pure h -WO 3 ·0.33H 2 O (from gray-white to dark gray) was attributed to the formation of a phase junction between h -WO 3 ·0.33H 2 O and o -WO 3 ·H 2 O. The photoelectrochemical results showed that this resulted in highly efficient charge carrier separation and transfer. The strong visual rendering of the black-green state may be useful for developing intelligent displays and similar devices.
研究领域:
材料科学
·
化学工程
·
光电材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaoping Jiang,Yue Guo,Lixi Wang,Qitu Zhang
The integration of dynamic photoluminescence and photochromism to achieve dual-modal characteristics can substantially elevate the security of anticounterfeiting measures. In this study, a novel bifunctional phosphor, namely CaAl 12 O 19 :Eu, Tb possessing dynamic photoluminescence and photochromism, is developed by the sol-gel combustion method. As the duration of exposure to 254 nm ultraviolet radiation increases, the CaAl 12 O 19 :Eu, Tb phosphors exhibit exceptional dynamic luminescent characteristics and pronounced color changes. Furthermore, this exposure results in a photochromic phenomenon on the surface of the samples, causing a shift from white to light brown. With an increase in Tb doping concentration, distinct and diverse chromatic variations easily discernible are observed by the naked eye. In addition, the mechanisms underlying the dynamic photoluminescent and photochromic characteristics are analyzed herein. Furthermore, the application of the bifunctional phosphor CaAl 12 O 19 :Eu, Tb for advanced dual-modal multicolor anticounterfeiting is explored, offering enhanced security against duplication attempts.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Xinyao Wang,Xinhuan Ma,Shiqiang Cui,Shouzhi Pu
Photochromic compounds have been widely used in many fields due to their excellent properties. However, their properties would degrade significantly, due to the influence of environmental factors, such as oxygen, pH, and so on. Using microencapsulation technology to protect them was one of the ways to maintain their original good performance. Herein, photochromic microcapsule with poly (methyl methacrylate) (PMMA) as shell material and photochromic diarylethene as core material was prepared by the solvent evaporation method. The results showed that the prepared microcapsule had uniform particle size, smooth surface, tight coating, excellent photochromic sensitivity, and outstanding fatigue resistance. In addition, the photochromic microcapsule was printed on cotton fabric by adhesive, which also showed excellent reversible photochromic properties, soap washing resistance, and acid and alkali resistance.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2020
·Vol. 29
·期 8
·669-677
·
IF 1.707
Lei Yuan,Shi Yiyuan,Jiang Liang,Lei Jingxin,Wu Bo
A novel class of photochromic copolymer based on spironaphthoxazine (SO) moieties was smoothly prepared through the copolymerization of methyl methacrylate (MMA), butyl acrylate (BA) and SO-based monomer by photopolymerization. Polymerization efficiency was studied by measuring the content of SO in eluents, which decreased with increasing mass ratio of SO in precursor monomer. The incorporated SO moieties endow the copolymers with remarkable photochromic ability. The novelty of this study is that unlike conventional physically blending photochromic polymer, SO moieties were chemically bonded with polymer chain, which is an effective way to prevent the SO from migration, thus increasing the stability and reliability during the long-term application. Moreover, the copolymerization was prepared through UV polymerization in the absence of organic solvent, which is environmentally friendly. Polymer chain flexibility can be well tuned by changing the mass ratio of BA. To make the copolymer more flexible, plasticizer of dibutyl phthalate (DBP) was also introduced. The photochromic ability of the as-prepared films was enhanced with increase in flexibility of polymer chain, which achieved the optimum state when the mass ratios of plasticizer DBP (dibutyl phthalate) and precursor BA (butyl methacrylate) were 20% and 50%, respectively. The thermal stability and tensile strength of the products were characterized by thermogravimetric analysis and electronic universal testing machine, which revealed that these copolymers could be applied as photochromic materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yujia Hu,Yongsheng Sun,Shengran Hou,Dongdan Chen,Zhongmin Yang
Inorganic photochromic (PC) materials are gaining increasing recognition as promising candidates for applications in optical storage and information display. However, conventional photochromic materials exhibit sluggish coding rates and a deficiency in intelligent response for writing and erasing under multiple excitation sources. This deficiency contributes to suboptimal readout/decoding efficiency and storage security. Here, we show a Ba 2 NaNb 5 O 15 :Er 3+ photochromic material with photoluminescence reversible modulation that can fast respond to both ultraviolet light and 532 nm laser within about 1 s, which accompanied by thermal bleaching. The PC mechanism which is based on defect state exchanges between oxygen vacancy defects and color centers is attributed to the structural flexibility of Nb-O systems and oxygen vacancy increased under irradiation. More importantly, it shows differential PC decay behavior in response to X-ray and UV light due to the difference in the number of trapped carriers. Therefore, a simple strategy based on different self-recovery levels induced by double excitation is constructed to develop an encrypted optical memory model. This fast and differential excitation source response behavior hopefully stimulates the development of new encrypted optical memory.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Rongbo Ma,Weichao Huang,Xinyong Gong,Chaoyong Deng
Photochromic luminescent materials have attracted much attention as a promising field in information encryption and anti-counterfeiting applications. Herein, a series of color-tunable with reversible photochromic BaSrY 4 O 8 : Bi 3+ /Eu 3+ phosphors were synthesized by the solid-state reaction method. The emission of BaSrY 4 O 8 : Bi 3+ , Eu 3+ phosphor exhibits tunable emission colors depending on the excitation wavelength or the Eu 3+ concentration. The effective energy transfers from Bi 3+ to Eu 3+ were observed, and the energy transfer mechanism was explained. Additionally, the color of the phosphor shows a reversible change from white to brown when exposed to different light stimuli (365 nm and 450 nm light). The reversible photochromic effect can be quantified by analyzing the changes in the emission spectra and diffuse reflectance spectra. The photochromic mechanism was investigated. Furthermore, an advanced anti-counterfeiting and encryption application was designed by combining multicolor luminescence with reversible photochromic under different light stimuli. The prepared anti-counterfeit pattern exhibits rapid luminescence modulation and noticeable multimodal changes in bright and dark fields. These results suggested that the BaSrY 4 O 8 : Bi 3+ /Eu 3+ phosphors are promising applications in information encryption and anti-counterfeiting.
研究领域:
材料科学
·
光学
·
信息科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）