INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Yu Wang,Fang Zhao,Jie Wang,Ali Raza Khan,Yulin Shi,Zhang Chen,Kaiqiang Zhang,Li Li,Yanfeng Gao,Xuhong Guo
VO2/PNIPAm hybrid thermochromic material has been verified as promising to improve optical performance of smart windows. However, VO2 can be easily oxidized especially when being dispersed in the hydrogel matrix, and also the nonuniform dispersion of VO2 in a host will worsen the material’s optical performance. Herein, pure VO2(M)@SiO2 nanoparticles (NPs) were first prepared using a surfactant-free method. Then VO2(M)@SiO2/PNIPAm hybrid microgels were synthesized through suspension polymerization. The VO2(M)@SiO2 NPs in the hydrogel matrix exhibited obviously improved resistance to oxidation. Monodispersed hybrid microgel with uniformly distributed VO2(M)@SiO2 NPs (Sample I) was obtained. Meanwhile, compared with the best VO2 film reported, our composite microgel (Sample III) demonstrated a 164% increase in the solar modulating ability at a relatively high average luminous transmittance (38.4%). All these remarkable features of VO2(M)@SiO2/PNIPAm microgel synthesized in our work will help a lot in the practical application of the inorganic–organic hybrid nanothermochromic materials.
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
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Zhe Qu,Lin Yao,Jing Li,Junhui He,Jie Mi,Shihui Ma,Siyao Tang,Lili Feng
Thermochromic vanadium dioxide (VO2) as one of the most promising candidates for smart windows has attracted widespread attention in recent years. Excellent optical performances (luminous transmittance, Tlum, and solar modulation efficiency, ΔTsol) of VO2-based coatings are usually pursued as crucial issues. In the current work, we report an ingenious approach for the synthesis of VO2@SiO2 dual-shell hollow nanospheres (DSHNs) and the preparation of DSHNs thermochromic coatings. A sequential bifunctional template-induced mechanism for the formation of DSHNs was proposed. Because of the unique hollow-core and dual-shell structure, the as-prepared VO2@SiO2 DSHNs coatings exhibited appealing optical performances with enhanced luminous transmittance of 61.8% and solar modulation efficiency of 12.6%, compared with continuous and dense VO2 coatings. It has been proved that the improvement of visible transmittance could be ascribed to the effective reduction of refractive index (from 2.6 to 1.6 at 630 nm). In addition, its excellent thermochromic performance has been confirmed by the model cubes measurements, expressing a great potential as energy-efficient smart windows in high-rise buildings. The bifunctional template-induced synthetic strategy may inspire more facile, efficient and inexpensive processes for development of well-defined multishelled hollow nanostructures for varied applications.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 19
·9208-9213
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IF 6.233
Yijie Zhou,Aibin Huang,Yamei Li,Shidong Ji,Yanfeng Gao,Ping Jin
Transition-metal oxide nanocrystals are novel candidates for being used as the hosts of localized surface plasmon resonance because they exhibit fascinating properties arising from the unique characteristics of their outer-d valence electrons. VO2(M) nanocrystal is well-known due to its reversible metal-insulator transition (MIT) temperature near room temperature (∼68 °C) corresponding to the appearance/disappearance of localized surface plasmon resonance across the MIT. In this study, a microemulsion-based method was introduced to synthesize VO2(M)@SiO2 nanoparticles which were applied to prepare VO2-based thermochromic foils owing to a strong and tunable surface plasmon resonance in the metallic state. The optical transmittance spectra demonstrates that the employment of surface plasmon resonance in VO2-based thermochromic foils greatly improves their solar regulating efficiency up to 18.54%, and provides an unprecedented insight in optimizing VO2-based thermochromic windows for solar control.
研究领域:
材料科学
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纳米技术
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光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10689-10698
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IF 3.553
Zhang Rong,Xiang Bo,Feng Min,Xu Yujiao,Xu Lei,Xia Liru
Smart windows can slow down the heating rate in buildings to a certain extent and realize energy savings and emission reduction. Various approaches have attempted to make windows ‘smart’ by tailoring their thermal insulation behavior in response to environmental changes. However, there is still room for further improvement in their efficiency and automation performance. Here, based on photothermal functional fillers and shape memory substrates, a new type of photoactuator for smart windows—passively controlled shuttering—was designed. The photoactuator was composed of VO 2 @SiO 2 and methyl methacrylate butyl acrylate polymer (MBP). These two functional components had similar transition temperature (30 °C), and the photothermal conversion of VO 2 @SiO 2 stimulated the shape memory behavior of the composite. It was demonstrated that the intelligent performance was closely related to the shape memory properties of MBP and the phase transition characteristics of VO 2 NPs, which synergistically modified the solar regulation ability. The results suggest that this new type of optical driving window has potential applications in the field of wearable sensors, energy conservation and medical devices.
研究领域:
材料科学
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能源工程
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2019
·
IF 3.621
Yingying Li,Runan Gao,Jian Li
Energy saving materials are economically and environmentally beneficial as they effectively reduce energy consumption and greenhouse gas emissions. In this study, energy saving wood composite was prepared by injecting a methyl methacrylate dispersion containing a mixture of VO 2 (M)@SiO 2 core-shell nanocomposites and thermochromic microcapsules into wood templates. APTS was added to stabilize the suspension. The good compatibility between the injected substances and the wood template benefited from the PMMA and APTS that filled the cell lumen and bonded the substances, leading to energy saving wood composite with excellent dimensional stability, optical properties, and mechanical performance. More importantly, the energy saving wood composite exhibited outstanding temperature regulatory ability by shielding needless infrared radiation, resulting in thermal comfort. The unique properties of the energy saving wood composite could potentially be applied in building, furniture, thermal insulation, energy conversion, energy storage, and conservation.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2026
·
IF 4.5
Jingxiao Liu,Ruiqi Hou,Zixuan Wang,Jiaxiang Wan,Peng Zhou,Yefan Jia,Wei Wang,Fei Shi
Highly porous VO 2 -SiO 2 composite aerogels were in-situ prepared via CO 2 supercritical drying. • The VO 2 -SiO 2 aerogel films exhibited high sunlight modulation and thermal insulation performance. • The VO 2 -SiO 2 aerogel can be used for smart windows due to its thermochromism/thermal insulation synergy and good durability. Vanadium dioxide (VO 2 ) shows great potential for applications in smart windows due to its reversible metal-insulator phase transition and unique thermochromism, but its low visible transparency and poor stability require further improvement, and low thermal conductivity is vital for energy-saving windows. Herein, a thermochromic VO 2 -SiO 2 composite aerogel with high thermal insulation and high stability was in-situ synthesized via sol-hydrothermal and CO 2 supercritical drying process. The results demonstrate that the VO 2 -SiO 2 composite aerogels possess a highly porous structure, with a large pore volume ranging from 1.44 to 2.15 cm 3 /g and an average pore diameter of 11.24-19.00 nm. The as-prepared VO 2 -SiO 2 aerogel/PMMA composite films with V/Si molar ratio of 3 exhibit the highest solar modulation ability (Δ T sol = 12.84%) and at 90°C, exhibits a surprising increase in visible light transmittance, reaching the highest value of 48.87%, which is 4.49% higher than that at 20°C. Moreover, the thermal insulation performance test results indicate that all the composite aerogel films exhibit good thermal insulation performance, and maintain excellent thermal stability after 30 cycles of thermal insulation tests. This study presents a novel strategy for fabricating VO 2 -SiO 2 composite aerogels, which can fully exploit the synergistic effect between VO 2 and SiO 2 aerogels, showing great application potential for energy-saving windows. Download: Download high-res image (365KB) Download: Download full-size image
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Zongxu Na,Xiao Liang,Hao Wang,Li Yu,Chunming Fan,Qian Wang,Xianbao Wang,Huai Yang
Smart photovoltaic windows (SPWs) are an emerging green technology presenting energy-saving by combining solar irradiance regulation and solar energy harvesting. The SPWs integrating extraordinary energy-saving performance, stable and controllable operational mode, and diverse functionality are essential for devising high efficiency energy-saving buildings (ESBs). However, the attainment of such features has yet to be realized in current iterations of SPWs. Herein, a conceptual demonstration of a split-type broadband modulation, self-driven, and self-cleaning SPWs is presented by coupling a silicon solar cell with a multifunctional chromogenic unit (MCU) for creating highly efficient ESBs. Within the multilayer structured MCU, thermal-responsive polymer stabilized liquid crystal (PSLC) and VO 2 @SiO 2 nanoparticles act as chromic component, enabling broadband light modulation. Thanks to the excellent electrothermal effect of indium tin oxide (ITO), the phase transition of PSLC and VO 2 @SiO 2 nanoparticles can be induced by the electrical power output generated by the silicon solar cell. Therefore, the transparency of SPWs can be manipulated according to the occupant's preference during the daytime. Moreover, a superhydrophobic SiO 2 coating provides SPWs with self-cleaning capability which effectively reduces water resource consumption and eliminates the inconvenience of window cleaning, while providing occupants with a clear view even in complex weather conditions.
研究领域:
能源工程
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材料科学
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环境科学
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电气工程
✓ 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）