ChemistryOpen
·
2019
·Vol. 9
·期 3
·272-276
·
IF 2.205
Xiaoke Song,Jun-Peng Wang,Yan Song,Tao Qi,Guo Liang Li
Graphical Smart polymers : Bioinspired healable mechanochromic (HMC) materials from synthesized fluorescent polyurethane film is constructed. The mechanochromic function of the HMC materials is tunable from the hierarchical bilayer nanostructures. In addition, the broken mechanochromic function of HMC materials can be almost restored at a mild condition for high level of information encryption. Camouflage and wound healing are two vital functions for cephalopods to survive from dangerous ocean risks. Inspired by these dual functions, herein, we report a new type of healable mechanochromic (HMC) material. The bifunctional HMC material consists of two tightly bonded layers. One layer is composed of polyvinyl alcohol (PVA) and titanium dioxide (TiO 2 ) for shielding. Another layer contains supramolecular hydrogen bonding polymers and fluorochromes for healing. The as-synthesized HMC material exhibits a tunable and reversible mechanochromic function due to the strain-induced surface structure of composite film. The mechanochromic function can be further restored after damage because of the incorporated healable polyurethane. The healing efficiency of the damaged HMC materials can even reach 98 % at 60 °C for 6 h. The bioinspired HMC material is expected to have potential applications in the information encryption and flexible displays.
研究领域:
材料科学
·
生物仿生学
·
光学材料
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DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 18
·3049
·
IF 4.329
Yuhua Zhang,Xi Zhang,Yurong Yan,Zhonghua Chen
Photochromic materials are interesting materials because of their color-changing property under UV light and visible light irradiation. However, they are vulnerable to many factors, such as pH oxygen, ion, solvent, etc. because of the unsaturated bonds existing on the photochromic molecular. Microencapsulation of the photochromic materials can separate them from the surroundings. Here, photochromic microcapsules using 3,3-Diphenyl-3H-naphtho[2,1-b] pyran (NP)/solution as core and polyurea as shell via interfacial polymerization were prepared, and bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate (HALS 770) was used as photostabilizer. Fourier transform infrared spectroscopy (FTIR), a laser particle size analyzer, a scanning electron microscope (SEM), a thermogravimetric analyzer and an ultraviolet-visible spectrophotometer were used for characterization. The results showed that the microcapsules had a uniform particle size of about 0.56 μm when the percentage of the oil phase (core) in the emulsion was less than 15%, the addition amount of the emulsifier was 0.4%, and the stirring rate was 1800 r/min. The microcapsules showed better performance in thermal stability when the core/shell ratio was 1:1. The photostabilizer had little impact on the color-changing property of the microcapsule, but it could protect the microcapsules from UV light radiation aging.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Guoxiang Xie,Yifan Li,Jing Luo,Changheng Wu,Mengran Cao,Dahai Zhu,Xinfeng Wu,Huaqing Xie,Wei Yu
Thermochromic materials exhibit variable optical properties in response to ambient temperature changes and are promising for the development of smart windows aimed at reducing energy consumption in buildings. However, scaling up the thermochromic materials-based smart window with a broad color-changing range remains a significant challenge for practical engineering applications. In this study, we present a series of PNIPAm-based thermochromic hydrogels with controllable discoloration temperatures ranging from 24 to 43 °C, achieved by regulating the swelling–dissolution transition. These materials demonstrate a high solar modulation capacity (>81%), excellent transmittance (>83%), and low haze value (<9.87%). Two strategies for the integration of smart windows are provided, and their effectiveness in reducing energy consumption is verified. Practical application tests conducted in Shanghai during the summer show that using smart windows can reduce indoor temperatures by up to 13 °C. Simulation results further indicate that these smart windows offer significant energy-saving benefits in various cities, particularly those with high daily energy consumption and poor thermal insulation. Additionally, the thermochromic hydrogel is coupled with a thermoelectric hydrogel, utilizing the residual heat from the glass surface to generate electricity, thus powering small electrical appliances.
研究领域:
材料科学
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能源工程
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建筑技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhenni Ding,Zilin Li,Yanhui Cao,Kaifeng Chen,Haiyan Zhuang,Jingjing Wang,Congshu Huang,Chi Ma,Dajiang Zheng
By depositing V 2 O 5 on precursor co-CoNi films with MnO 2 pretreatment layer using cyclic voltammetry (CV), a ternary electrochromic (EC) film with high performance and multicolor characteristic was obtained in this work. Compared with binary electrochromic film with deposition of V 2 O 5 on CoNi hydroxide films directly, the introduction of MnO 2 enhanced the cyclic stability significantly through formation of a more compact micro morphology and appearance of more active sites in this case. In addition, the ternary film presents higher optical modulation, less response time, higher coloring efficiency, better color memory ability, larger color range and faster electrochemical kinetics. The excellent electrochromic performance of the obtained film makes it possible to manufacture multicolor transparent EC devices, and demonstrates a promising application prospect in related fields.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
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
Journal of Energy Storage
·
2024
·
IF 8.9
Qi Liu,Chongqin Xu,Guiying Wang
In this work, a continuous thermochromic energy storage material (CTESM) was developed based on two distinct mechanisms, which provided a wider range of colors. Separate formulations of thermochromic energy storage materials were made using hexadecanol as the solvent, crystal violet lactone (CVL) as the color former, bisphenol A (BPA) as the developer, or crystal violet lactone and cresol red (CSR) interacting as color former and developer, respectively. More color changes were explored according to the above two combinations. Functional groups and thermal properties of CTESM were studied utilizing Fourier Transform Infrared, Thermogravimetry Analysis, X-ray diffraction and differential scanning calorimetry. This research indicates that the maximum color difference, which occurs in the condition that the ratio of CVL:BPA:CSR:HD is 2:1:2:140, enables transitions from blue-gray to green hues and then to red. Overall, CTESM has excellent thermal stabilities and cycling capabilities, leading to significant potential in anti-counterfeiting and sensors.
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 ELECTROANALYTICAL CHEMISTRY
·
2012
·
IF 2.905
Bin Hu,Yujian Zhang,Xiaojing Lv,Mi Ouyang,Zhiyan Fu,Cheng Zhang
Two new electrochromic materials consisting of carbazole and phenyl-methanone units, 4-(9H-carbazol-9-yl)-phenyl-methanone (CPM) and 4-(3,6-di(thiophen-2-yl)-9H-carbazol-9-yl)-phenyl-methanone (TCPM), were synthesized and characterized. Both the compounds show well-defined oxidation and reduction processes. Spectroelectrochemical analysis reveals that their polymers display reasonable optical contrast (25%, 41%) and fast switching time (3 s, 2 s). Cyclic voltammogram study confirms that the polymer with the existence of thiophene units is more stable in electrochemical environment.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Yong Zhang,Jianxu Ren,Yiwei Wu,Xiangli Zhong,Tao Luo,Juexian Cao,Mengqi Yin,Mingpeng Huang,Zhiyong Zhang
Ultra-low humidity detection is significant in some important industrial fields, such as integrated circuit manufacturing, chip packaging. However, the traditional ionic-type humidity sensor is not competent for the detection of ultra-low humidity, but can only realize the detection of medium humidity to high humidity. Here, moisture-induced discoloration material Nickel(II) iodide (NiI 2 ) is found to be highly sensitive to moisture, and both its electrical properties and color will change with environmental humidity variation. Especially, NiI 2 exhibits the largest impedance change to date in the ultra-low humidity range compared with state of the art. The impedance variation is up to 2 orders of magnitude in the range of 0.4 %–11 % RH, which means that NiI 2 can realize the detection of ultra-low humidity. The excellent performance of NiI 2 in ultra-low humidity is attributed to the material transition characteristics susceptible to humidity rather than the traditional surface mechanism of water adsorption. Moreover, combining the reversible black-to-transparency moisture-induced discoloration behavior with humidity sensing properties, a flexible wristband based on NiI 2 is developed to realize the dual-mode detection of wide range environmental humidity. These results demonstrate that NiI 2 has great application prospects in professional ultra-low humidity detection and wearable humidity detection equipment.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2022
·
IF 7.188
Jisheng Song,Bingkun Huang,Siying Liu,Litao Kang,Ziyang Zhang,Guangyang Shang,Yaxin Yang,Xiangming Li,Deyi Wang
As an attractive electrochromic (EC) material, Prussian blue (PB) holds many praiseworthy merits such as environmental benignity, low cost, proper redox potential, and fast electrochemical kinetics, thanks to their unique open framework structure consisting of common elements. However, restricted by the available synthetic methods and the formation of crystallographic imperfects, facile fabrication of large areal and high performance PB EC layers is still challenging. In this article, we establish a simple yet effective protocol to prepare PB EC layers with the assistance of ITO nanoparticle (ITO-np). This preparation method involves just an interfacial precipitation reaction between Fe(CN) 6 4- from the electrolyte and Fe 3+ from the acid-etched sacrifice layers. The ITO-np, as a transparent conductive additive, is used to enhance not only electrical conductivity but also adhesion strength of the prepared PB EC layers. The whole processes can be completed under atmospheric pressure without requests of any sealed reaction spaces, and thus should be very friendly to scale up fabrication. The as-prepared PB layers demonstrate decent EC performances with a transmittance modulation of 59.9% at 633 nm, a bleaching/coloring time of 12 s/8s, a cycling lifetime with 77% transmittance modulating ability remained after 1200 cycles, along with a remarkable charge storage/release ability. This work provides an alternative approach for the facile preparation of PB-based films for applications of both EC devices and smart-supercapatteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2018
·
IF 2.526
Yaxin Zhang,Fuhan Liu,Yanjun Hou,Haijun Niu
Here, we synthesized four kinds of monomers of 3,6-dibromo-(N-phenyl)carbazole with different substituent group, DCB, DDC, DNC and DTC, respectively, and used 4-(3-bromo-9H-carbazol-9-yl)benzaldehyde to react with triphenylamine (TPA) unit and hydrazine hydrate unit, respectively, to obtain the other two monomers, BCB-TPA and BCB-HH. Six novel polymers coded as PDCB-DF, PDDC-DF, PDNC-DF, PDCB-DTC-DF, PBCB-TPA-DF and PBCB-HH-DF, were synthesized by Suzuki reactions of 2,2'-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(1,3,2-dioxaborinane) with the six kinds of monomers and their electrochemical and spectroelectrochemical properties were investigated. The polymers showed good solubility and film-forming ability. Flexible or robust films of them could be readily obtained via solution-casting. These polymers showed the onset temperatures in the range of 300–470 °C when the 10% weight loss of polymers. The polymer films showed high coloration efficiency (CE) (196-376 cm 2 ·C −1 ) and electrochromic stability. These properties illustrate that the polymers have great application prospect as electrochromic materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2029
·
IF 4.6
Kuangguo Yan,Haiquan Chen,Chenjie Zhu,Zhao Ke,Dongwu Li,Mengxia Wang,Fengna Dai,Youhai Yu
Two novel electrochromic aromatic polyimides (named as TPA-BIA-PI and TPA-BIB-PI, respectively) with pendent benzimidazole group were synthesized from 1,2-Diphenyl-N,N′-di-4-aminophenyl-5-amino-benzimidazole and 4-Amino-4′-aminophenyl-4″-1-phenyl-benzimidazolyl-phenyl-aniline with 4,4′-(hexafluoroisopropane) phthalic anhydride (6FDA) via two-step polymerization process, respectively. Then, polyimide films were prepared on ITO-conductive glass by electrostatic spraying, and their electrochromic properties were studied. The results showed that due to the π-π* transitions, the maximum UV–Vis absorption bands of TPA-BIA-PI and TPA-BIB-PI films were located at about 314 nm and 346 nm, respectively. A pair of reversible redox peaks of TPA-BIA-PI and TPA-BIB-PI films that were associated with noticeable color changed from original yellow to dark blue and green were observed in the cyclic voltammetry (CV) test. With increasing voltage, new absorption peaks of TPA-BIA-PI and TPA-BIB-PI films emerged at 755 nm and 762 nm, respectively. The switching/bleaching times of TPA-BIA-PI and TPA-BIB-PI films were 13 s/16 s and 13.9 s/9.5 s, respectively, showing that these polyimides can be used as novel electrochromic materials.Keywords:benzimidazole;two-step polymerization;polyimide films;electrochromic materials
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2019
·Vol. 305
·期 1
·1900539
·
IF 3.038
Bo Wu,Yuan Lei,Yao Xiao,Yanjun Wang,Ye Yuan,Liang Jiang,Xi Zhang,Jingxin Lei
Utilization of bionics to develop stimuli responsive polymers that can heal damage with excellent restorability is particularly attractive for a sustainable society. Herein, inspired by chameleons, a hierarchical structural design strategy is proposed and illustrated to fabricate a healable photochromic material based on a self-healable polymeric matrix and a finely dispersed photochromic spirooxazine. The self-healable polymeric matrix is fabricated via the integration of multiple hydrogen bonds (H bonds) and covalent cross-links into a biomass-derived elastomer. The dynamic nature and soft characteristics enable the as-prepared elastomer superior extensibility as well as self-healing ability, while the covalent cross-links can assist the reassociation of ruptured H bonds. The representative elastomer exhibits an extensibility of 2600% and toughness of 42.76 MJ m −3 . Furthermore, it shows good self-healing ability with complete recovery of scratch as well as restoration against 1900% of elongation and 24.1 MJ m −3 of toughness after healing at 60 °C for 24 h. This combination of moderate toughness, good self-healing ability, and smart photochromic property in biomass-derived materials should largely improve their applicability, reliability, and sustainability in various materials and devices.
研究领域:
材料科学
·
高分子化学
·
仿生学
✓ 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）