Energies
·
2022
·Vol. 15
·期 22
·8542
·
IF 3.252
Yue Zhang,Ruixing Li
Nanoscale tungsten bronze can convert near-infrared light into thermal energy. For a chemical synthesis, intermediate products and processes are potentially positive or negative to an end product. In this study, (NH4)2SO4was added into the hydrothermal system of WO3, CsCl, CH3CH2CHO, and NH3·H2O to increase the Cs/W ratio in solution. An intermediate, Cs1.1W1.65O5.5, was isolated. Subsequently, it was confirmed via a kinetics experiment conducted for different times. The results of the NH3·H2O and NH4COOCH3system indicate there are two influence factors that influence the formation of Cs1.1W1.65O5.5: the leaching out of W and imine reactions. A low leaching out rate induces a high Cs/W ratio and low-concentration W in solution, leading to the formation of Cs1.1W1.65O5.5. The imine reaction decreasing CH3CH2CHO restrains the reduction in Cs1.1W1.65O5.5. The increase in CH3CH2COO−with the reduction reaction results in both the micron-size sticks and nano-size equiaxial particles in powder.Keywords:cesium tungsten bronze;intermediate;hydrothermal;synthesis;near-infrared response
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Luomeng Chao,Changwei Sun,Jiaxin Li,Miao Sun,Jia Liu,Yonghong Ma
Although the optical properties of nanocrystalline cesium tungsten bronze have been widely studied, there is a lack of research on the effect of particle size on its optical properties. In order to further investigate size and shape effect on the NIR shielding performance, cesium tungsten bronze nanoparticles with different sizes and morphologies were prepared by two methods. The size of irregular shaped samples prepared by solvothermal method is tens of nanometers, while the size of hexagonal prism shaped samples prepared by solid state reaction method is hundreds of nanometers. The element spectrums shows that there are more oxygen vacancies in large particles than in small particles. The NIR shielding performance of large particles far lower than that of small particles, indicating that the influence of shape and size on optical properties is more obvious than that of oxygen vacancy. Theoretical calculation on hexagonal prism shaped particles exhibits that the NIR extinction of large aspect ratio is better at longer wavelength and small aspect ratio is better at shorter wavelength.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Guanghui Liu,Ju Xu,Ruixing Li
Recently, nano-cesium tungsten bronze (Cs x WO 3 ) is found to be a new candidate for the application in solar filter due to its high visible transmittance and excellent near-infrared shielding ability. However, a typical two-dimensional (2D) Cs x WO 3 has not been reported since 2D nanomaterials have attracted great attention due to their fascinating properties, e.g., graphene. Herein, a novel synthesis system and related mechanisms are tried to develop for synthesizing 2D Cs x WO 3 via hydrothermal method, which an original inspiration derived from the morphology control of sulfides. The results indicate that morphology modifier represents a new strategy in which thiourea and oleylamine interact synergistically rather than independently to synthesize 2D Cs 0.3 WO 3 . The more regular and larger the rectangular nanosheet, the broader and stronger the light absorption, the rectangular Cs 0.3 WO 3 nanosheets with the maximum size are synthesized from thiourea, oleylamine and HCl concentrations of 4, 0.061 and 320 mmol/L, respectively, and exhibit a broad and strong absorption spectrum. The above nanosheet shows excellent instantaneous photo-thermal conversion property resulting in an obvious temperature increases from 20 °C to 88.5 °C when it was irradiated by 50 W halogen lamp for 10 s. Finally, both chemical reaction and morphological evolution in the synthesis processes are revealed.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Dayi Yang,Jingxiao Liu,Fei Shi,Yi Li,Jiaxiang Wan,Xinyu Yuan,Ziwei Tian,Meiyu Wang,Chuangchuang Ma
Synthesis of cesium tungsten bronze (Cs x WO 3 ) nanorods with excellent near-infrared shielding performance by a one-step solvothermal method from cheap tungsten source is still challenging. In this work, small-sized Cs x WO 3 nanorods with excellent transparent thermal insulation performance were synthesized by a one-step solvothermal method. It was found that halogen acids played an important role in regulating the growth and microstructure of Cs x WO 3 nanorods. Moreover, different halogen acid can regulate the content of W 5+ =O and oxygen vacancies (V O ) in Cs x WO 3 nanorods, which is helpful to further improve the near-infrared shielding performance of Cs x WO 3 particles. Compared with HF and HBr, the Cs x WO 3 nanoparticles synthesized under the regulation of HCl contain more V O s and W 5+ =O content, showing more excellent near-infrared shielding performance, and the as-prepared Cs x WO 3 -PVA composite film exhibits low haze and high transparency, with the near-infrared light shielding rate at 1500 nm attaining to 97.7% when the visible light transmittance is 71.8%. The thermal insulation test results show that the Cs x WO 3 -PVA composite film synthesized under the regulation of HCl can effectively reduce the indoor temperature by 6.9 °C under the irradiation of sunlight. After 100 cycles of thermal insulation tests, the near-infrared shielding and thermal insulation performance have not declined, showing excellent photothermal stability. This work is of great significance for promoting the industrial production of high-performance Cs x WO 3 nanoparticles and its application in energy-saving windows.
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
CRYSTENGCOMM
·
2019
·Vol. 21
·期 21
·3264-3272
·
IF 3.382
Shuai Qi,Xiudi Xiao,Yuan Lu,Changmeng Huan,Yongjun Zhan,Hongsha Liu,Gang Xu
A simple one-step solvothermal route was developed to fabricate homogenous cesium tungsten bronze (Cs0.32WO3) nanoparticles, and an environmentally friendly aqueous solution was used to prepare transparent NIR shielding coatings. Based on the results, the addition of Cs+ ions promoted the formation of Cs2WOCl5 crystals, which inhibited the hydrolysis process of WCl6 and limited the formation of hexagonal tunnels. Controlled formation of hexagonal tunnels is favorable for Cs+ ions that completely enter the hexagonal vacant tunnels to form the Cs0.32WO3 crystals. Via a controllable formation process, the superior crystalline Cs0.32WO3 nanoparticles with the primary particle size of 30–60 nm were synthesized at the low temperature of 200 °C and short time of 4 h without any other additives. Furthermore, the Cs0.32WO3 nanoparticles were well dispersed in the aqueous solution, and the as-prepared coating exhibited a high SETS value (0.72), which remained constant with an increase in the film thickness. Simulated solar irradiation experiments revealed that the as-prepared film cut off over about 91.6% of radiation. The simulated model of the real environment revealed that compared with the ordinary glass and commercial Cs0.32WO3, the as-prepared Cs0.32WO3 film showed superior NIR shielding performance for practical application.
研究领域:
材料科学
·
纳米技术
·
光学工程
·
环境科学
·
表面工程
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 21
·5196
·
IF 3.1
Yunpeng Liu,Yuqi Mu,Xihao Yang,Zhiyu Yao,Shaofeng Peng,Jincheng Shi,Wendi Tian,Yen Wei,Kangmin Niu
This study is dedicated to the development of a new type of cesium tungsten bronze energy-saving laminated glass and explores its application in insulating glass combinations, offering innovative ideas and practical solutions for advancing energy-saving glass technology. Experimental results show that both CsxWO3(CWO) dispersions exhibit good visible light transmittance and near-infrared shielding properties, with CWO1 demonstrating superior shielding in the 650–950 nm range, attributed to differences in shape and size distribution and verified by simulations using the Drude–Lorentz model and the finite element method.
研究领域:
材料科学
·
光学工程
·
建筑节能
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 8
·085708
·
IF 1.449
Bian Wang,Qingjuan Wang,Yuting Zhu,Litao Kang,Jingxin Zhu,Fuyi Jiang,Wei Du,Dongjiang You,Zongtao Zhang,Feng Gao
Cesium tungsten bronze (CsxWO3) is an important functional material for energy efficient windows, showing excellent near infrared (NIR) shielding ability but no optical switching ability. In this paper, we demonstrate a photo-/thermo-dual-responsible CsxWO3/PNIPAM composite by dispersing CsxWO3 nanoparticles into PNIPAM hydrogels. Combination of the photothermic conversion ability of CsxWO3 with the thermochromic property of PNIPAM makes this hydrogel responds to both thermo- and photo-stimuli. In sunlight, the CsxWO3 component converts the absorbed infrared light into heat, triggering the phase transition of PNIPAM and switching the hydrogel into visibly opaque state (for example, transmittance decreased from 58% down to 15% at 590 nm). At the same time, an ambient temperature >32 °C can also initiate the phase transition of PNIPAM. Therefore, a photo- and/or thermo-derived transition between a 'transparent NIR-shielding' state and a 'full-solar-spectrum shielding' state is achieved, making it highly attractive for the applications as energy efficient windows for buildings in hot climate.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 13
·6019-6024
·
IF 8.867
Ziya Yu,Yongji Yao,Jianing Yao,Liangmiao Zhang,Zhang Chen,Yanfeng Gao,Hongjie Luo
CsxWO3 nanoparticles were dispersed in prepolymerized methyl methacrylate (PMMA) and filled in nanopores of delignified wood to prepare transparent wood. The wood-based composite showed excellent near-infrared (NIR, ranging from 780 to 2500 nm) shielding ability and high visible light transparency. The CsxWO3/transparent wood also showed excellent mechanical properties with a fracture strength up to 59.8 MPa and modulus up to 2.72 GPa. CsxWO3/transparent wood is expected to serve as a potential material for smart-window applications.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Boxu Shen,Yuanhao Wang,Lin Lu,Hongxing Yang
In this study, spectrally selective coating with improved near-infrared shielding property was fabricated by direct spray technique using the Cs 0.33 WO 3 and Sb-doped SnO 2 as composite filler. The effect of Cs/W molar ratio on phase composition, crystal structure, morphology, chemical state and optical property was investigated. The results reveal that the Cs/W molar ratio has a significant influence in promoting the form of hexagonal crystal structure, which is beneficial to improve spectral selectivity. Especially, when the Cs/W molar ratio was 0.375, the as-synthesized Cs 0.33 WO 3 product demonstrated the desired phase composition and W 5+ generation. Furthermore, the spectrally selective coating prepared by the dispersion with 10 wt% composite filler combined with Cs 0.33 WO 3 and Sb-doped SnO 2 presented optimal optical performance. The excellent near-infrared shielding performance of the spectrally selective coating indicates great potential in the field of energy-efficient glazing.
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
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2024
·Vol. 57
·期 14
·145501
·
IF 3.1
Bo Zhang,Jian Qiang Liu,Dian Yuan Wang,Feng Hui An,Liang Xu
Cesium doped tungsten bronze (CWO) nanoparticles can selectively keep high transmittance in the visible while presenting significant shielding rate in the near-infrared region. How to further improve the optical properties of CWO based on solid state method is crucial to the industry production. Based on changing the particle size and morphology of WO3 precursors, cesium-tungsten bronze powders with different dispersivity and concentrations of Cs+ doping were successfully prepared by solid-phase method. The characterization analysis reveals that the precursors with appropriated surface area and morphology are significant to improve the dispersivity of CWO nanocrystal and increase the density of free carriers, thereby improving the small polariton absorption performance and the local surface plasmon resonance effect. The result provides an effective strategy to boost the optical property of CWO nanocrystal synthesized by optimizing the morphology and size of precursor, which is important to the industry production and practical applications in the field of energy-saving window films.
研究领域:
材料科学
·
纳米技术
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2021
·
IF 3.846
Pengfei Yang,Zhihuan Zhao,Xiao Zhang,Wen Liu,Jimin Fan,Jianying Lin,Shasha Yang,Bing Zhang,Shu Yin
Cesium tungsten bronze nanoparticles have excellent near infrared lightresponse characteristics, easy surface modification and low cytotoxicity, which are attractive for tumor photothermal therapy. In this paper, cesium tungsten bronze nanoparticles were synthesized by a simple hydrothermal reaction method using cesium hydroxide as raw material. In order to improve the properties of dispersion and drug loading, the modification of two different surfactants was investigated. Themorphology of cesium tungsten bronze nanoparticles modified with polyvinylpyrrolidone had no significant change in scanning electron microscope, but it had high photothermal properties, with a photothermal conversion efficiency of 23.1%. The drug loading capacity of CTAB-Cs0.32WO3 is 47.9 mg/mL accordingly. The michigan cancer foundation-7 (MCF-7) cell activity was only 27.33% when the concentration of CTAB-Cs0.32WO3-DOX was 1mg/ml under irradiation of 980nm. These results showed that cesium tungsten bronze nanoparticles surface modified with hexadecyltrimethyl ammonium bromide (CTAB) had excellent anti-tumor ability.
研究领域:
材料科学
·
生物医学工程
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiang Cheng,Chenguang Huang,Yinping Wu,Jiuwu Wang,Yue Situ,Hong Huang
The development of functional thermal insulation materials is of great significance for energy saving and emission reduction in the building field and is meanwhile a powerful strategy for the construction of a low-carbon society. Cesium tungsten bronze nanomaterials (CWO) have attracted increasing attention in the field of transparent coating for their excellent near-infrared shielding performance, but their practical application is severely limited by the problems of particle agglomeration and secondary heat release. Here, silica hollow microspheres (HSNs) with an ultrathin pleated shell and adjustable particle size were prepared with multiblock polyurethane surfactants as a soft template. Silica/cesium tungsten bronze composites (CWO@HSNs) with synergistically enhanced thermal insulation properties were obtained via the surface modification of HSNs. CWO@HSN composite coatings with appropriate mass ratios of HSNs to CWO show significantly better optical properties and thermal insulation effects than those of CWO coating, with room temperature dropped by up to 11.5 °C and coating surface temperature reduced by 7.3 °C. Notably, the composite process of CWO with HSNs can not only inhibit the agglomeration of CWO but also greatly reduce the secondary heat release of the coatings, indicating an effective solution for improving the application performance of nanoscale cesium tungsten bronze in the field of building thermal insulation.
研究领域:
材料科学
·
能源效率
·
建筑技术
✓ 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）