CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yang Zhou,Yiqi He,Simeng Qi,Sisi Zhao,Lulu Wang,Quan Xu
Thermal responsive hydrogel smart windows have attracted wide attention due to their design flexibility and excellent thermal responsive optical properties. Only relying on temperature control, sometimes the phase transition speed is not fast to meet the needs of rapid thermal response rate in practical applications. Here, a hydrogel with excellent photothermal response characteristics was prepared through combining the photothermal conversion efficiency of graphene nanoparticles and the thermal response effect of hydroxypropyl cellulose. The photothermal cooperative hydrogel (PCH) smart window has integrated high solar modulation ability (ΔT sol = 61.2 %), excellent infrared isolation ability (ΔT IR = 48.6 %) and fast response speed (within 2 min) successfully. In outdoor demonstrations, the PCH window can reduce 13.1 °C compared to the ordinary window, showing promising energy-saving performance in summer daytime. Simulations suggested that PCH window can cut off 13.1 % heating, ventilation, and air-conditioning (HVAC) energy consumption compared with the Low-E window in Singapore. The PCH window can dynamically adjust solar radiation through light and heat, which provides a new strategy for intelligently reducing the energy consumption of buildings.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Zihui Liang,Li Zhao,Wanfan Meng,Cheng Zhong,Shoubin Wei,Binghai Dong,Zuxun Xu,Li Wan,Shimin Wang
A simple and cost effective sol-gel process is developed for producing thermochromic tungsten-doped thin films of vanadium dioxide (VO 2 ). The precursor is first prepared by the reaction of vanadyl acetylacetonate, methanol, and tungsten chloride in a beaker. The precursor is then spin-coated on the substrate and, finally, annealed at 600 °C in argon gas. The resulting vanadium dioxide thin films are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, variable temperature UV/Vis spectroscopy, and contact angle measurements. The results indicate that the particles of tungsten-doped vanadium dioxide thin films range from 30 to 150 nm, and the thin films show excellent hydrophilicity with a water contact angle (WCA) of 12°. According to optical tests, the tungsten-doped vanadium dioxide thin films exhibit satisfactory optical properties with an applicable integrated luminous transmittance ( T lum,s = 80.75%, T lum,m = 79.24%) and excellent solar regulation efficiency (△ T sol = 9.10%, from T sol,s = 81.40% to T sol,m = 72.30%). The VO 2 films exhibit an applicable transition temperature of the semiconductor-to-metal phase change: at a W-doping level of 2 at.%, the transition temperature was measured to be 32 °C. The simple and low-cost method is a noteworthy addition to literature on the synthesis of nanostructured materials towards applications in energy-saving smart windows.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Xuan Du,Xin Liu,Yaxuan Cao,Qin Zhang,Guanghui Gao
Smart hydrogels have attracted considerable attention as smart window materials. However, the existing gel-based smart windows are often unable to be applied to humid environments due to their extreme swelling in aquatic environments. Herein, a nucleobase-inspired water-resistant adhesive is successfully designed and cleverly applied in smart windows. The adhesive exhibits durable and robust adhesion in various aquatic environments, including water, seawater, physiological saline, NaCl solutions, and a wide range of pH solutions (pH = 1–10). The adhesive can maintain high adhesive strength (∼0.8 MPa) in different harsh water environments for up to six months. Remarkably, the adhesive can be directly brushed onto surfaces of various shapes and substrates for information encryption and smart windows. The smart windows not only display stable and recyclable transparency changes triggered by solvents but also impart ordinary brittle glass with excellent impact resistance for effective stress protection. The water-resistant adhesives exhibit promising applications in underwater sealing, underwater repairing, underwater electronic devices, and underwater soft robots. It is anticipated that the strategy of water-resistant adhesive coatings will offer a broad perspective for the advancement of next-generation smart windows.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yongkang Zhu,Bin Li,Chenxu Li,Shouqin Tian
Recently, tungsten oxides have attracted extensive attention in the field of photochromic smart windows due to the naturally ultraviolet response, high luminous transmittance (Tlum), and substantial solar light modulation (ΔTsol). To promote its applications, limitations such as slow bleaching speed and poor reversibility need to be addressed urgently. Here, we proposed a Fe3+-doping mediated rapid electron transfer strategy to improve the overall photochromic performance of W18O49. By increasing the Fe3+ doping concentration, the bleaching speed of W18O49 films was significantly improved. Notably, films doped with 6 at% and 8 at% Fe3+ could be fully bleached within 5 min, with bleaching rates twice that of undoped films. This improvement is attributed to Fe3+ doping, which creates more oxygen vacancies in W18O49, facilitating the reduction of W6+ to W5+. Furthermore, the 6 at% Fe3+-doped W18O49 bilayer film exhibited excellent photochromic performance, with the ultrahigh Tlum and ΔTsol of 82.9% and 60.2%, respectively, fast photochromic speed (within 2 min), and nearly complete near-infrared light blocking in the colored state. These findings demonstrate the potential of Fe3+-doped W18O49 to significantly improve the performance of photochromic smart windows, offering promising avenues for energy-efficient building technologies.
研究领域:
材料科学
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能源技术
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Qingyang Pang,Li Bian,Jiebing Xu,Yuhang Jia,Chan Wang,Yingjie Zhang,Qiang Ju,Qiong Wu,Zhenlan Fang
Photochromic transparent wood (PTW) is a kind of highly desirable, green, energy-saving building material with a practical aesthetic. The application of PTW in smart windows still faces daunting challenges owing to the poor stability of photochromic reversibility and low sensitivity to sunlight. In this work, we develop a kind of prominent switchable PTW based on poplar wood (SPTW-P) that shows high sensitivity to sunlight using a new simple fabrication method. In contrast to commonly reported UV-responsive counterpart, our SPTW-P, obtained by microencapsulating active component and polymer with matched refractive index, exhibits the fastest switchable (∼1.5 s) photochromic response to sunlight, high sensitivity of color changing from colorless to peachy pink, strong mechanical strength (87.3 MPa), good transparency, and ideal cycling stability, as evidenced by the 100% maintenance of its original photochromic effect after cycling 30 times. The SPTW-P material not only shows superb UV-blocking (the highest UV-blocking value is up to 97.7%) for protecting skin, excellent thermal insulation for energy saving, good size maintenance, wonderful shape, and chemical stability (100%), but also exhibits excellent aesthetic properties (e.g., moldable aesthetic patterns). This work could promote the development of aesthetic functional transparent wood as sustainable building materials to substantially reduce carbon emissions and energy consumption.
研究领域:
材料科学
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绿色能源
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建筑技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Rong Li,Shidong Ji,Yamei Li,Yanfeng Gao,Hongjie Luo,Ping Jin
Rectangular and plate-like VO 2 (M)@SiO 2 nanoparticles were fabricated by a combination method of hydrothermal synthesis and post annealing process. Rectangular VO 2 (B) nanoplates of 20–30 nm in thickness were hydrothermally synthesized, and VO 2 (B)@SiO 2 core–shell structure was formed using a modified Stober method. Protected by inert SiO 2 shell, after post annealing the VO 2 (B)@SiO 2 was transformed to VO 2 (M)@SiO 2 without deteriorating its original plate-like morphology. Much interestingly, numerous nanopores were formed inside VO 2 (M)@SiO 2 nanoparticles due to the difference in density between VO 2 (B) and VO 2 (M), which contributes to higher optical transmittance and thermal insulation . Thermochromic foils were fabricated using the core–shell nanoparticles, showing promising potential for smart window.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yunxiang Chen,Zewei Shao,Yi Yang,Shuwen Zhao,Ying Tao,Heliang Yao,Hongjie Luo,Xun Cao,Ping Jin
Traditional vanadium dioxide (VO2) material faced severe challenges of low stability in acid, humid, and oxygenic environments, which hinder its real applications. Here, we report a facile improving process which can enhanced the stability of VO2 nanocrystals in the environments above. Ascorbic acid (AA), as an important antioxidant for organism in medicine and biology, was ingeniously used for enhancing the antioxidation abilities of inorganic material. At the same time, the AA could generate the hydrogen doping occurred on the surface of VO2 nanocrystals, which enhanced their Antiacid abilities simultaneously. The AA treated VO2 nanocrystals retain stable in H2SO4 and H2O2 solution and exhibit high durability in hyperthermal (60 °C) and humid (90%) environment. Characterizations and first-principles theoretical calculations confirmed that the coordination of ascorbic acid molecules on VO2 nanocrystals induced charge-carrier density reorganization and protons transferring electrostatically. Then the formed HxVO2 provides an enhancing formation energy for oxygen vacancy and protects the particles from corrosion. This work is beneficial to the VO2 nanoparticles coated and decorated processes and exhibit good potential for practical application of VO2-based smart windows.
研究领域:
材料科学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Yong Zhu,Yongji Yao,Zhang Chen,Zongtao Zhang,Pan Zhang,Zefeng Cheng,Yanfeng Gao
Tungsten oxide (WO 3 ) photochromic film for smart windows faces many challenges, including slight discoloration, and slow and irreversible photochromic response. We propose a WO 3 quantum dots (WQDs) to resolve the above problems, and WQDs-polyvinyl alcohol (PVA) transparent film by casting method exhibits quick response to ultraviolet light (<60 s), and large optical modulation (>90%) between bleached and colored states , although the bleaching time is still long (8 h). Meanwhile, the PVA/WQDs composite film is self-supported and exhibits excellent tensile properties . The actual cooling effect of the photochromic glass was tested using a model house and the annual energy consumption was simulated by using EnergyPlus software. For a warm city (Haikou), using this photochromic glass can reduce electrical consumption for cooling by 27.3%.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Kunming Li,Shengfei Meng,Shan Xia,Xiuyan Ren,Guanghui Gao
In recent years, the use of smart windows to adjust sunlight to achieve energy conversion has received increasing attention. In this paper, a novel smart window was easily prepared by using thermochromic hydrogels as an interlayer and indium tin oxide films as an electric heating layer. The shielding transmission rates of visible and near-infrared light reached 88.3 and 85.4% at the temperature of 25 °C, respectively. However, the transmittance at a light wavelength of 550 nm was greater than 70% after applying voltage. The smart windows with different components could possess thermochromic temperature ranging from 28 to 35 °C, which was suitable for daily life. The smart window could maintain a stable reversible thermochromic transition. Importantly, the time of light transition and the demand of energy efficiency could be adjusted by controlling the magnitude of the output voltage, which benefited the development of energy-efficient materials.
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yingying Li,Yanqiu Wang,Jing Lu,Wenwen Wang,Dong Wang
Smart windows are highly desired as emerging optical devices based on appealing sunlight modulation, however, some prevailing limitations remain with low photothermal conversion and narrow spectral adjusting ranges, which drastically restrict energy-saving performance. Herein, a strategically designed smart window achieves significant breakthroughs, containing photothermal fillers of Au nanoprisms (AuNPRs) hybrid MXene nanosheets, and copolymerized thermochromic poly( N -isopropyl acrylamide)-doped hyaluronic acid (HA) hydrogels. By harness of AuNPR@MXene nanocomposites as photo-trapped nanoheaters, stimulating thermo-responsive behaviors of hydrogels boosts solar transmittance switching. The compelling photothermal features depend on the amalgamation: thermoplasmonic effect of AuNPRs, broad-band-absorbed AuNPRs endowed by MXene, and thermal conductivity from AuNPRs to MXene, generating synergistic effects. We maximize the advancing transmittance regulation by controlling the proportion gain of HA to increase hydrogen-bonded interaction. The resulting device with low-loadings AuNPR@MXene composites (0.9 wt% and 0.98 vol%) is capable of allowing 78 % of the maximum visible light through before thermochromism and blocking 98.04 % of sunlight penetration when photothermal stimulation. Besides, outdoor measurements show an achievable great indoor temperature drop of about 7 °C only 30 min irradiation, and a skin-cooling performance in the wearable, illustrating the potential of adaptive solar modulation application.
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 24
·e53954
·
IF 3
Jian Wang,Wen Sun,Ming He
Thermoresponsive polymer hydrogels have great potential in the fields of smart window and information encryption due to the drastic changes in transmittance caused by the phase transition at specific temperatures. The synthesis of thermoresponsive hydrogels with a wide range and sensitive temperature response is current research goal. Here, we demonstrate a polymethacrylamide (PMAAm) hydrogel with the upper critical solution temperature (UCST) ranging from 62 to −1°C by simply polymerizing the monomer in different concentrations of acetic acid (Ac) solutions. The hydrogel exhibits sensitive temperature response with a temperature hysteresis within 2°C and can maintain stable transmittance changes after 200 cycles of testing. The phase transition mechanism is revealed by combining ultraviolet visible spectra, differential scanning calorimetry, Fourier transform infrared spectra, dynamic light scattering and scanning electron microscope measurements. This thermoresponsive hydrogel can be applied in smart window and information encryption. The smart window prepared with the hydrogel had a very high Δ T lum (The luminous transmittance modulation, 94.4%), ensuring daytime illumination and privacy protection at night. Meanwhile, the smart window exhibits an excellent thermal insulation capability for energy-saving buildings. The hydrogels with different UCST are flexibly combined to display designed patterns at different temperatures, demonstrating the ability of the hydrogels to be used for information encryption.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·
IF 4.3
Yang Gao,Kunming Li,Xiuyan Ren,Guanghui Gao
Graphical Hydrogels with gradient opaque-transparent transition thermochromic temperature from 5 °C to 53 °C were prepared and the accuracy was controlled at 1 °C. The thermochromic property was regulated by the aggregation state of sodium dodecyl sulfate micelles by adding potassium tartrate hemihydrate and cations. The thermochromic hydrogel can serve for smart window and temperature detector/monitor. In recent years, the thermochromic hydrogel was acted as suitable sandwiching material to adjust light transmission. However, to accurately control the thermochromic temperature in a wide range still was a significant challenge. Here, a simple method was explored to prepare hydrogels with gradient opaque-transparent transition thermochromic temperature from 5 °C to 53 °C, which was regulated by the aggregation state of sodium dodecyl sulfate micelles by adding potassium tartrate hemihydrate and cations. Using Li + , Na + , and K + as cations, the accuracy was controlled at 1 °C. Moreover, the transmittance of the hydrogel was not changed when the thermochromic temperature was adjusted. As a result, an intelligent window was fabricated by utilizing thermochromic hydrogel as a sandwiching layer into the outer glass layers, which could effectively and stably regulate the visible and infrared light. The temperature monitors/detectors were also designed, which showed excellent temperature monitoring/detecting ability. Therefore, this low-cost, high-efficient, large-scale prepared thermochromic hydrogel provided more potential for intelligent temperature devices.
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
危险品化学品经营许可证（带存储）