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 Preparation and Properties of Thermoresponsive P(N-Isopropylacrylamide-co-butylacrylate) Hydrogel Materials for Smart Windows

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Jae-Hyung Park ◽  
Ji-Won Jang ◽  
Jae-Hak Sim ◽  
Il-Jin Kim ◽  
Dong-Jin Lee ◽  
...  
Keyword(s):  
Light Transmission ◽  
Crosslinking Agent ◽  
Three Dimensional ◽  
Light Transmittance ◽  
Solar Light ◽  
Solution Temperature ◽  
Smart Window ◽  
Thermoresponsive Polymers ◽  
Smart Windows ◽  
Hydrogel Films

Thermoresponsive polymers that exhibit phase transition in response to temperature change can be used as material for smart windows because they can control solar light transmission depending on the outside temperature. The development of thermoresponsive polymers for a smart window that can be used over a wide temperature range is required. Therefore, to obtain smart window materials that can be used at various temperatures, three-dimensional thermoresponsive P(NIPAm-co-BA) hydrogels were prepared by free radical polymerization from main monomer N-isopropylacrylamide, comonomer butyl acrylate, and crosslinking agent N,N′-methylenebisacrylamide (MBAm) in this study. This study examined the effect of BA content on the lower critical solution temperature (LCST) and the solar light transmittance of crosslinked P(NIPAm-co-BA) hydrogel films. The LCST of hydrogel films was found to be significantly decreased from 34.3 to 29.5°C with increasing BA content from 0 to 20 mol%. It was found that the transparent films at T=25°C (T<LCST) were converted to translucent films at a higher temperature (T=45°C) (T>LCST). These results suggested that the crosslinked P(NIPAm-co-BA) hydrogel materials prepared in this study could have high potential for application in smart window materials.

scholarly journals Gate-controlled VO2 phase transition for high-performance smart windows

2019 ◽  
Vol 5 (3) ◽  
pp. eaav6815 ◽  
Author(s):  
Shi Chen ◽  
Zhaowu Wang ◽  
Hui Ren ◽  
Yuliang Chen ◽  
Wensheng Yan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solar Energy ◽  
Energy Saving ◽  
High Performance ◽  
Light Transmittance ◽  
Energy Regulation ◽  
Practical Application ◽  
Theoretical Limit ◽  
Smart Windows ◽  
Infrared Transmittance

Vanadium dioxide (VO2) is a promising material for developing energy-saving “smart windows,” owing to its infrared thermochromism induced by metal-insulator transition (MIT). However, its practical application is greatly limited by its relatively high critical temperature (~68°C), low luminous transmittance (<60%), and poor solar energy regulation ability (<15%). Here, we developed a reversible and nonvolatile electric field control of the MIT of a monoclinic VO2 film. With a solid electrolyte layer assisting gating treatment, we modulated the insertion/extraction of hydrogen into/from the VO2 lattice at room temperature, causing tristate phase transitions that enable control of light transmittance. The dramatic increase in visible/infrared transmittance due to the phase transition from the metallic (lightly H-doped) to the insulating (heavily H-doped) phase results in an increased solar energy regulation ability up to 26.5%, while maintaining 70.8% visible luminous transmittance. These results break all previous records and exceed the theoretical limit for traditional VO2 smart windows, making them ready for energy-saving utilization.

Active and passive modulation of solar light transmittance in a hybrid thermochromic soft-matter system for energy-saving smart window applications

2018 ◽  
Vol 6 (26) ◽  
pp. 7054-7062 ◽  
Author(s):  
Xiao Liang ◽  
Mei Chen ◽  
Qian Wang ◽  
Shumeng Guo ◽  
Lanying Zhang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Energy Saving ◽  
Vanadium Dioxide ◽  
Soft Matter ◽  
Light Transmittance ◽  
Solar Light ◽  
Light Control ◽  
Smart Window ◽  
Matter System ◽  
Window Applications

In this work, we promote a new hybrid liquid crystals/vanadium dioxide thermochromic system for solar light control and energy-saving smart window applications.

scholarly journals High-Efficiency Responsive Smart Windows Fabricated by Carbon Nanotubes Modified by Liquid Crystalline Polymers

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 440
Author(s):  
Yuan Deng ◽  
Shi-Qin Li ◽  
Qian Yang ◽  
Zhi-Wang Luo ◽  
He-Lou Xie
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystalline ◽  
Near Infrared ◽  
High Efficiency ◽  
Polymer Brush ◽  
Light Transmittance ◽  
Smart Window ◽  
Vertical Orientation ◽  
Smart Windows ◽  
Conversion Materials

Smart windows can dynamically and adaptively adjust the light transmittance in non-energy or low-energy ways to maintain a comfortable ambient temperature, which are conducive to efficient use of energy. This work proposes a liquid crystal (LC) smart window with highly efficient near-infrared (NIR) response using carbon nanotubes grafted by biphenyl LC polymer brush (CNT-PDB) as the orientation layer. The resultant CNT-PDB polymer brush can provide the vertical orientation of LC molecules to maintain the initial transparency. At the same time, the smart window shows a rapid response to NIR light, which can quickly adjust the light transmittance to prevent sunlight from entering the room. Different from common doping systems, this method avoids the problem of poor compatibility between the LC host and photothermal conversion materials, which is beneficial for improving the durability of the device.

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

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

scholarly journals Problems and Prospects of Nanometer Transparent Infrared Thermal Insulation Glass

2018 ◽  
Vol 53 ◽  
pp. 01013
Author(s):  
Nan Zhang ◽  
Mengyuan Xu ◽  
Ning Li
Keyword(s):  
Energy Conservation ◽  
Visible Light ◽  
Energy Saving ◽  
Building Energy ◽  
Light Transmittance ◽  
Large Area ◽  
Existing Building ◽  
Economic Application ◽  
Performance Indexes ◽  
Building Energy Saving

The existing building energy-saving reconstruction has a large area in our country. If the performance indexes such as the shading coefficient, visible light transmittance and hardness of the coating heat-insulating glass are in the condition of reaching the specification, and it can meet the needs of energy conservation and reform in building, it is a suitable technology for economic application.

Recent progress with electrocatalysts for urea electrolysis in alkaline media for energy-saving hydrogen production

2020 ◽  
Vol 10 (6) ◽  
pp. 1567-1581 ◽  
Author(s):  
Xiujuan Sun ◽  
Rui Ding
Keyword(s):  
Hydrogen Production ◽  
Energy Saving ◽  
Recent Progress ◽  
Cell Voltage ◽  
Alkaline Media ◽  
Wastewater Remediation ◽  
Urea Electrolysis

Urea electrolysis is a promising energy-saving avenue for hydrogen production owing to the low cell voltage, wastewater remediation and abundant electrocatalysts.

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