CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Tingfeng Ma,Bin Li,Shouqin Tian,Jiachen Qian,Longxiao Zhou,Qiufen Liu,Baoshun Liu,Xiujian Zhao,Gopinathan Sankar
W 18 O 49 has widely used in photothermal application and photocatalyst due to its strong Localized Surface Plasmon Resonance (LSPR) effect and unique oxygen-deficient structure. In addition, the unstable structure and easily changed valence state of W 5+ make W 18 O 49 potentially photochromic. However, the generally synthesized blue W 18 O 49 particles was in a saturated colored state, delivering a great challenge in exploring its photochromic features, which thus have seldom been studied. Herein, we found that the bleached W 18 O 49 obtained by mild-heating the solvothermal-synthesized blue W 18 O 49 nanoparticles in air had considerable reversible photochromic feature, which can be colored in 1 min under UV irradiation. The photochromic mechanism of W 18 O 49 was revealed through the XRD, XPS and FTIR results. The chromic process was mainly attributed to the changed W 5+ content under different conditions. The photochromic performance was systematically investigated on the W 18 O 49 -based film and which can be significantly improved by Ti doping. Finally, the great potential of the films in the energy-saving smart windows application has verified, and a 10 at.% Ti-doped W 18 O 49 film delivered outstanding optical performance with luminous transmittance ( T lum ) of 87.53% and solar energy modulation efficiency (Δ T sol ) of 30.13%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Xuan Yang,Zesen Yu,Hedong Jiang,Huanhuan Guo,Jian Sun,Jiake Li,Hua Zhu,Yanxiang Wang,Pingchun Guo
Metal–organic frameworks (MOFs) are promising candidates for thermochromic materials. In this study, a hydrogen-bonded 3D porous metal–organic framework, Co-BTC (Co3(BTC)2·12H2O, BTC = 1,3,5-benzenetricarboxylate), exhibited a pink color at room temperature, attributed to the d–d transition of Co2+ ions within the framework, and displayed reversible thermochromic behavior due to alterations in the coordination environment of Co2+ ions. Additionally, Co-BTC/PVB thermochromic film was successfully designed and fabricated as a smart window with a monolayer structure. The window exhibited reversible thermochromic behavior comparable to Co-BTC, with visible transmittance modulation of 10.73%, near-infrared transmittance modulation of 25.87%, and solar transmittance modulation of 12.63%. Compared to a pure PVB window, the smart window reduced indoor temperatures by 5.7 °C in field tests, indicating a significant energy-saving effect. This research presents a potential application for the rational design of MOFs in the development of advanced smart windows.
研究领域:
材料科学
·
能源工程
·
建筑技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Tuodong Xiong,Wanxiong Yong,Na Chen,Guodong Fu
Photochromic materials have recently attracted widespread attention in the research of smart windows because they can function without additional devices. In this study, an innovative photochromic thermal insulating hybrid film based on a polyurethane matrix was prepared via a one-pot method, incorporating phosphotungstic acid. The film demonstrates excellent transparency, good mechanical strength, and a significant modulation of the solar spectrum, transitioning from colorless to dark blue under sunlight without the need for additional electron donors. This photochromic behavior is reversible and reproducible without degradation, resulting in a transmittance variation of up to 71 % at 550 nm, which is the most sensitive to the human eye, and more than 50 % modulating performance in 1800 ∼ 2500 nm. In addition, thermal insulation experiments proved that the smart window device prepared by the film could achieve a reduction of 9.3 °C under daylight. Overall, the photochromic films prepared using the one-pot method show good performance involving mechanical strength, efficient photochromic response, broad spectral range modulation, high coloring efficiency and cycling stability, and have promising applications in energy-saving buildings, anti-counterfeiting and smart displays.
研究领域:
材料科学
·
能源工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Jiayi Tian,Peng Liu,Yahao Zhao,Wei Zheng,Gen Li,Changchun Han,Wen Liu,Qing Li,Zhijie Den,Xinguo Ma,Furong Ye,Yizhong Huang
Vanadium dioxide (VO2) is a promising material for smart windows due to its metal–insulator transition that enables dynamic solar transmittance modulation. In this study, VO2 (M) nanoparticles were synthesized using a novel approach involving the self-supported structure of V4C3 MXene derived from V4AlC3. Through selective etching, solvothermal oxidation and annealing, VO2 (M) nanoparticles with enhanced thermochromic properties were produced. The self-supported structure of V4C3 MXene significantly reduced particle agglomeration and improved crystallinity, resulting in VO2 (M) films with a luminous transmittance (Tlum) of up to 58.3% and a solar modulation ability (ΔTsol) of 6.3%. The study also demonstrated that film thickness and hydrogen peroxide concentration critically influence optical and thermochromic performance. This study provides a new approach for the preparation of MXene-based VO2 thermochromic smart window materials and is expected to promote their application in the field of building energy conservation.
研究领域:
材料科学
·
能源与建筑节能
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Junyao Chen,Sheng Cao,Yuwei Liu,Shihua Qin,Huiying Li,Tao Yang,Jialong Zhao,Bingsuo Zou
Electrochromic windows can control the amount of sunlight entering buildings, thus enabling thermal regulation and offering a significant opportunity to reduce building energy consumption. However, current electrochromic windows encounter difficulties with multi-color control and fully independent adjustment of visible light and near-infrared heat. Herein, this work introduces an advanced multi-color four-mode dual-band electrochromic smart window (DESW) that not only showcases various color transformations but also independently manages visible light and near-infrared heat from solar radiation, providing year-round thermal regulation for buildings. This device features a zinc anode with Prussian blue analogues and tungsten oxide film electrodes. Its optical state superposition effect allows for a range of color transformations (yellow, orange, green, and black), enhancing visual appeal and offering four distinct optical states for precise control of visible light and near-infrared transmittance. Simulation results show that this device achieves greater energy efficiency than commercial glass in most global climates throughout the year. Moreover, the energy generated by this multi-color four-mode DESW can be used to power low-energy devices within the building, further decreasing overall energy consumption. This research opens up extensive possibilities for smart window design and supports the development of green buildings, contributing to global carbon neutrality and sustainable development.
研究领域:
建筑材料
·
能源技术
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2022
·
IF 8.663
Ping Yu,Zemin He,Yuzhen Zhao,Huimin Zhang,Haiquan Zhang,Zongcheng Miao,Wenbo Shen
As an important type of liquid crystal (LC)-based smart windows for indoor illumination/privacy protection switching and energy conservation, the LC devices from polymer dispersed liquid crystals (PDLCs) have gained more attention for developing flexible intelligent optical films. However, higher voltages are generally needed to drive these devices owing to the large content of polymers and the strong anchoring effect on mesogenic molecules, which not only induces the danger of use but also increases the energy consumption of the devices. In this work, a polymerizable zwitterionic compound, which has little problem with ion accumulation compared to typical electrolytes, is explored as a new class of coating. Zwitterion-treated LC devices are also fabricated using different processing methods. Both the addition of zwitterionic layers and the processing techniques have profound effects on the electric-optical performance of the resultant devices. The driving voltage of the devices is optimized from 58 V to 15–18 V (∼2.9 V/μm to ∼0.75–0.9 V/μm) and the contrast ratio is still above 200. The haze of the optimized flexible smart film is about 89.78% and 5.38% in field-off and field-on states respectively. The electrically switchable transmittance of the flexible zwitterion-treated LC devices is also implemented on windows and the human body. Such a method offers a simple strategy for fabricating the LC devices promising for applications in wearable devices as well as in low-energy-consumption smart windows.
研究领域:
材料科学
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光学工程
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
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IF 3.9
Xiaoshuai Li,Meishan Zhang,Chi Zhang,Rui Niu,Hongmei Ma,Yubao Sun
Bistable liquid crystal devices, which require electricity only at the switching processes of the two states, have advantages in energy saving and safety compared with monostable liquid crystal devices. Due to electrohydrodynamic and dielectric effects, the ion-doped cholesteric liquid crystal can switch between a focal conic state and a planar state with different frequencies of the driving voltage. However, the cholesteric liquid crystal that self-assembles from the dynamic scattering state always has a poor focal conic state, resulting in a low contrast ratio. This paper presents a bistable polymer-stabilized ion-doped cholesteric liquid crystal device. The introduction of a small amount of polymer network can greatly enhance the light scattering capabilities of the focal conic state, endowing the device with excellent electro-optic performance. The electro-optical properties of the device are investigated with the various content of monomer and chiral dopant , and rotational viscosity of liquid crystal. Liquid crystal with a low rotational viscosity coefficient is beneficial to the formation of a good polymer network. The pitch induced by chiral dopant impacts the formation process of the polymer network, which subsequently affects the electro-optical properties. The bistable device has a low driving voltage and a high contrast ratio, making it ideal for use in smart windows.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 14
·8681-8693
·
IF 4.9
Yi Zhaodi,Song Zengbin,Wang Jian,He Ming
Hydrogel smart windows with light modulation capability have received widespread attention because they can meet the requirements of indoor lighting at daytime, privacy protection at night and energy saving. However, it remains challenging to achieve these multiple goals simultaneously and enable active actuation to meet the temporary needs of users. In this study, a thermal and solvent responsive hydrogel smart window was developed by introducing hydroxypropyl cellulose (HPC) and sodium dodecyl sulfate (SDS) micelles into a polyacrylamide (PAAm) cross-linked network. By adding different concentrations of NaCl solution, the hydrogels underwent upper critical solution temperature (UCST)- and lower critical solution temperature (LCST)-type phase transitions in the ranges of 1 − 15 °C and 25 − 80 °C, respectively, which enabled the hydrogel to achieve a reversible transition between opacity and transparency with temperature change. The smart window exhibited an excellent solar modulation ability (T lum = 91.39%, ΔT sol , 15−5℃ = 68.67%, ΔT sol , 15−40℃ = 62.50%) and effective IR shielding. Furthermore, actively actuated light modulation of hydrogel smart windows was achieved by spraying ethanol on the hydrogel surface. Ethanol stimulation and volatilization induced the reconfiguration and dissociation of hydrogen bonds between HPC and PAAm molecular chains, resulting in reversible transparency transitions. We anticipate that this facile strategy for preparing thermal and solvent responsive hydrogels could serve as a promising alternative for designing phase change hydrogels for a variety of applications. Graphical Abstract
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
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Kaiqiang Zhang,Yulin Shi,Liang Wu,Long Chen,Tingting Wei,Xin Jia,Zhang Chen,Manqiu Li,Yisheng Xu,Yu Wang,Yanfeng Gao,Xuhong Guo
A thermo and pH dual-responsive starch (TPDS) was successfully synthesized by etherification, in which butyl glycidyl ether (BGE) was used as the hydrophobic reagent followed by addition of 2-chloro-4, 6-diglycino-[1,3,5]-triazine (CDT) groups. The obtained materials were characterized by Fourier transform–infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance ( 1 H NMR) and elemental analysis to confirm the structure and the average substitution degree of BGE and CDT on starch molecule. It was observed that the lower critical solution temperature (LCST) of the TPDS could be modulated from 31 °C to 47 °C by increasing pH of the solution. The effects of pH and the concentration of such materials on the energy-saving performance of TPDS which could be potentially used as smart windows were investigated by UV-vis-NIR spectrophotometry. The solar modulating ability (△T sol ) and the luminous transmittance (△T lum ) of the sample were 40.1% and 47.1% when 10 g/L TPDS was chosen at pH 3. The results indicate that TPDS exhibits excellent optical performance with a controllable LCST, which shows great potential for the application as a smart window.
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
Advanced Materials Interfaces
·
2020
·Vol. 8
·期 1
·2001606
·
IF 4.948
Zuohao Wen,Yujie Ke,Chengchen Feng,Shuliang Fang,Miuyang Sun,Xinghai Liu,Yi Long
The VO 2 -based smart windows can dynamically and reversibly adjust the indoor solar irradiation to reduce the energy consumption for building glasses. This paper reports the first successful preparation of Mg-doped VO 2 @ZrO 2 core−shell nanocrystals with promoted thermochromic performance as well as tunable appearance and wettability. The achieved combination of T lum of 52.4% and ∆ T sol of 7.1% is comparable to the best-reported results of VO 2 -based core−shell rod structures. The thickness of ZrO 2 shell is tunable between 3 and 14 nm, resulting in a slightly hydrophobic surface and a slight color change toward blue-green and brighter produced films. The preparation method based on hydrothermal and UV-curing methods is facile. This work may inspire future development of VO 2 synthesis, their structure−property, and the application the thermochromic films for energy-saving purposes in buildings or automobiles.
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Yining Ma,Huaijuan Zhou,Jingting Zhu,Shidong Ji,Shanhu Bao,Rong Li,Ping Jin
Flake-like VO 2 (M) has been successfully synthesized by annealing plate-like (NH 4 ) 0.6 V 2 O 5 in vacuum and its thermochromicity was investigated. Preparation conditions such as temperature and vacuum degree have been varied to obtain the pure phase. The formation mechanism from ammonium vanadium bronze to VO 2 (M) has been explored. The flake-like VO 2 (M) shows an excellent thermochromicity; the infrared modulation at 2500 nm was up to 56.6% with a 30% visible transmittance which will be beneficial for smart windows, smart curtains or other applications.
研究领域:
材料科学
·
热致变色材料
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yunfei Xie,Yingchao Zhang,Meini Li,Ruonan Huang,Xincai Liu,Danming Chao
Electrochromic capacitive windows (ECW) combining energy storage and electrochromism have attracted considerable interest because of their unique energy-saving and energy-recovery features. Therefore, it is highly desirable to explore an electrode material with excellent electrochromic and energy storage properties simultaneously. Herein, we synthesize an electroactive polyamide containing pentaaniline segments (EPA) in the main chain via oxidative coupling polymerization, which showcases electrochemical optical modulation and high capacitance synchronously. Attributed to non-acidic electrolyte and rational matching with V 2 O 5 ion-storage material, the as-fabricated ECW exhibits good dual-band optical modulation performance with high optical contrast of 56.57% at 650 nm (Visible region) and 53.29% at 1250 nm (NIR region), fast optical switching response (<5 s), as well as effective regulation of indoor temperature. The resultant ECW also possesses practical energy storage properties, along with a wide voltage window of 2 V, a large capacitance of 47.26 mF/cm 2 , and outstanding electrochemical cycling durability. In its coloring state, the energy stored in ECW could be utilized to drive small-scale electronic equipment, indicating its energy recovery and reuse feature. In conclusion, the ECW in this work functions as a color-switching smart window and a rechargeable supercapacitor, which exhibits great promise for development in green buildings.
研究领域:
材料科学
·
能源技术
✓ 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）