Energy-Saving Smart Windows with HPC/PAA Hybrid Hydrogels as Thermochromic Materials

2021 ◽  
Author(s):  
Liangmiao Zhang ◽  
Hui Xia ◽  
Fang Xia ◽  
Yi Du ◽  
Yupeng Wu ◽  
...  
Keyword(s):  
Energy Saving ◽  
Smart Windows ◽  
Hybrid Hydrogels

Self-Regulation of Infrared Using a Liquid Crystal Mixture Doped with Push–Pull Azobenzene for Energy-Saving Smart Windows

2021 ◽  
Vol 13 (4) ◽  
pp. 5028-5033
Author(s):  
Seung-Won Oh ◽  
Seung-Min Nam ◽  
Sang-Hyeok Kim ◽  
Tae-Hoon Yoon ◽  
Wook Sung Kim
Keyword(s):  
Liquid Crystal ◽  
Energy Saving ◽  
Self Regulation ◽  
Smart Windows ◽  
Crystal Mixture

Thermochromic Hydrogels with Dynamic Solar Modulation and Regulatable Critical Response Temperature for Energy‐Saving Smart Windows

2021 ◽  
pp. 2109597
Author(s):  
Gang Xu ◽  
Huan Xia ◽  
Pengyu Chen ◽  
Wei She ◽  
Hanning Zhang ◽  
...  
Keyword(s):  
Energy Saving ◽  
Solar Modulation ◽  
Smart Windows ◽  
Critical Response

Hydrogel smart windows

2020 ◽  
Vol 8 (20) ◽  
pp. 10007-10025 ◽  
Author(s):  
Yang Zhou ◽  
Xiaoxiao Dong ◽  
Yuanyuan Mi ◽  
Fan Fan ◽  
Quan Xu ◽  
...  
Keyword(s):  
Energy Saving ◽  
Recent Progress ◽  
Light Transmittance ◽  
Solar Light ◽  
Smart Windows

Smart windows are a promising way to modulate solar light transmittance, which is crucial for energy saving buildings. We provide an overview of the recent progress in hydrogel-based smart windows.

scholarly journals Energy-Efficient Smart Window Based on Thermochromic Hydrogel with Ultrahigh Visible Transparency and Unprecedented Infrared Transmittance Modulation

2021 ◽  
Author(s):  
Rong Zhang ◽  
Bo Xiang ◽  
Min Feng ◽  
Liru Xia ◽  
Lei Xu ◽  
...  
Keyword(s):  
Energy Saving ◽  
Superior Performance ◽  
Significant Advance ◽  
Solar Modulation ◽  
Smart Window ◽  
Smart Windows ◽  
Responsive Materials ◽  
Infrared Transmittance ◽  
Potential Applications ◽  
Glass Panels

Abstract Both high visible transparency and strong solar modulating ability are highly required for energy-saving smart windows, but conventional responsive materials usually have low transparency and narrow solar transmittance range. Herein, we report a significant advance toward the design and fabrication of responsive smart windows by trapping novel V0.8W0.2O2@SiO2 doped poly(N-isopropyl acrylamide) (PNIPAm) thermochromic liquid hydrogel within two glass panels. The smart window is highly transparent to allow solar transmittance at low temperatures, while turns opaque automatically to cut off solar energy gain when exposed in sunlight. With a remarkably low content (1.0wt‰) of dopant, V0.8W0.2O2@SiO2/PNIPAm (VSP) hydrogels exhibit ultrahigh luminous transmittance Tlum of 92.48% and solar modulation ∆Tsol of 77.20%. The superior performance is mainly attributed to that V0.8W0.2O2@SiO2 doping induces PNIPAm particles’ size reduction and internal structure change. W-doping decreases the phase transition temperature (Tc) of VO2 from 68 ºC to ~30 ºC (close to the Tc of PNIPAm), contributing to an unprecedented infrared transmittance modulation. Especially, the smart window shows excellent energy-saving during daytime outdoor demonstrations where practically achievable cooling temperature reaches up to 15.1 ºC. In addition, the smart window exhibits outstanding stability, as embodied by unchanged optical performance even after 100 transparency-opaqueness reversible cycles. This new type of thermochromic hydrogel offering unique advantages of shape-independence, scalability together with soundproof functionality promises potential applications in energy-saving buildings and greenhouses.

Metal oxides in energy-saving smart windows

2018 ◽  
pp. 341-360 ◽  
Author(s):  
Yanfang Wang ◽  
Bingwei Chen ◽  
Yusong Zhu ◽  
Lijun Fu ◽  
Yuping Wu ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Energy Saving ◽  
Smart Windows

A Dual-Responsive Nanocomposite toward Climate-Adaptable Solar Modulation for Energy-Saving Smart Windows

2017 ◽  
Vol 9 (7) ◽  
pp. 6054-6063 ◽  
Author(s):  
Heng Yeong Lee ◽  
Yufeng Cai ◽  
Shuguang Bi ◽  
Yen Nan Liang ◽  
Yujie Song ◽  
...  
Keyword(s):  
Energy Saving ◽  
Solar Modulation ◽  
Smart Windows ◽  
Dual Responsive

A novel soft matter composite material for energy-saving smart windows: from preparation to device application

2015 ◽  
Vol 3 (20) ◽  
pp. 10738-10746 ◽  
Author(s):  
Yanzi Gao ◽  
Wenhuan Yao ◽  
Jian Sun ◽  
Huimin Zhang ◽  
Zhendong Wang ◽  
...  
Keyword(s):  
Composite Material ◽  
Liquid Crystal ◽  
Energy Conservation ◽  
Composite Film ◽  
Energy Saving ◽  
Vinyl Acetate ◽  
Soft Matter ◽  
Ethylene Vinyl Acetate ◽  
Smart Windows ◽  
Conservation Efficiency

A novel soft-matter composite film of ethylene-vinyl acetate and liquid crystal with an energy conservation efficiency of 40.4% is developed.

Energy-Efficient Smart Window Based on Thermochromic Microgel with Ultrahigh Visible Transparency and Infrared Transmittance Modulation

2021 ◽  
Author(s):  
Rong Zhang ◽  
Bo Xiang ◽  
Yuchun Shen ◽  
Liru Xia ◽  
Lei Xu ◽  
...  
Keyword(s):  
Energy Saving ◽  
Energy Efficient ◽  
Smart Window ◽  
Smart Windows ◽  
Responsive Materials ◽  
Infrared Transmittance

Both high visible transparency and strong solar modulating ability are highly required for energy-saving smart windows, but conventional responsive materials usually have low transparency and narrow solar transmittance range. Herein,...

scholarly journals Recent Advances in Fabrication of Flexible, Thermochromic Vanadium Dioxide Films for Smart Windows

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2674
Author(s):  
Jongbae Kim ◽  
Taejong Paik
Keyword(s):  
Thin Films ◽  
Energy Saving ◽  
Near Infrared ◽  
Solar Spectrum ◽  
Smart Windows ◽  
Space Group ◽  
Practical Applications ◽  
Flexible Polymer ◽  
Recent Advances ◽  
Potential Applications

Monoclinic-phase VO2 (VO2(M)) has been extensively studied for use in energy-saving smart windows owing to its reversible insulator–metal transition property. At the critical temperature (Tc = 68 °C), the insulating VO2(M) (space group P21/c) is transformed into metallic rutile VO2 (VO2(R) space group P42/mnm). VO2(M) exhibits high transmittance in the near-infrared (NIR) wavelength; however, the NIR transmittance decreases significantly after phase transition into VO2(R) at a higher Tc, which obstructs the infrared radiation in the solar spectrum and aids in managing the indoor temperature without requiring an external power supply. Recently, the fabrication of flexible thermochromic VO2(M) thin films has also attracted considerable attention. These flexible films exhibit considerable potential for practical applications because they can be promptly applied to windows in existing buildings and easily integrated into curved surfaces, such as windshields and other automotive windows. Furthermore, flexible VO2(M) thin films fabricated on microscales are potentially applicable in optical actuators and switches. However, most of the existing fabrication methods of phase-pure VO2(M) thin films involve chamber-based deposition, which typically require a high-temperature deposition or calcination process. In this case, flexible polymer substrates cannot be used owing to the low-thermal-resistance condition in the process, which limits the utilization of flexible smart windows in several emerging applications. In this review, we focus on recent advances in the fabrication methods of flexible thermochromic VO2(M) thin films using vacuum deposition methods and solution-based processes and discuss the optical properties of these flexible VO2(M) thin films for potential applications in energy-saving smart windows and several other emerging technologies.

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