Flexible gasochromic films with favorable high temperature resistance and energy efficiency

Qi, Wanyu; Wu, Guangming; Wang, Haoran

doi:10.1016/j.solmat.2019.01.049

Cited by 18 publications

(9 citation statements)

References 29 publications

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“…(3),  n is the refraction angle corresponding to the incidence angle ,  a is the natural absorptance of the glass, mm -1 , s  is the total glass thickness, mm, n is the refractive index of the glass. All materials and technologies used in conventional smart windows [1][2][3][4][5][6][7][8] are also applicable to windows with grating filters.…”

Section: Methodsmentioning

confidence: 99%

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Simulation of daylight in buildings with curved facades for rational use of solar energy

Zakirullin

Odenbakh

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Simulation of daylight conditions in buildings with curved facades was carried out to show the possibility of more efficient use of solar energy with a constant change in the azimuth of the windows orientation. To optimize daylighting, a smart window with optical filter is proposed having an angular selectivity of light transmission due to two surface gratings with alternating transmissive and chromogenic parallel strips. Unlike conventional smart windows, the entire area of which is covered with chromogenic layers, a grating filter weakens or completely blocks direct solar radiation by allowing diffused sky light and reflected light to pass through. Methods for calculating the geometric parameters of the gratings are presented and the optimal slope angles of the filter gratings for windows with different azimuths of a building with round facade and the temporal characteristics of the light transmission of these windows are calculated. The results substantiate the advisability of using smart windows with grating filters in buildings with curved facades to improve the comfort of daylighting and insolation, to protect against direct rays when passing diffuse sky light and albedo by adapting the light transmission of windows to a change in the position of the sun relative to them.

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Section: Methodsmentioning

confidence: 99%

“…The optical properties of electrochromic [7] windows change when a weak current is passed through thin-layer coatings. The light-transmissive properties of gasochromic windows [8] change under the alternating action of oxygen and hydrogen pumped into the window chamber.…”

Section: Introductionmentioning

confidence: 99%

Simulation of daylight in buildings with curved facades for rational use of solar energy

Zakirullin

Odenbakh

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…5 In contrast to other colorswitchable films, 6,7 gasochromic films, which appear blue when exposed to hydrogen and transparent when exposed to oxygen, have received considerable attention. 8 Gasochromic films only require a nanoporous layer (WO 3 ) and a catalyst layer (Pd), 9 which can lower the manufacturing cost and better facilitate the promotion and production of optical gas sensing and energy-saving applications. The function of gasochromic films largely depends on the WO 3 structure, and the crystallization process should be avoided.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanoporous WO₃ Gasochromic Films for Gas Sensing

Xue

Zhang

Jiang

et al. 2021

ACS Appl. Nano Mater.

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Nanoporous tungsten oxide (WO3) films have been widely applied in gasochromic and electrochromic windows due to their high hydrogen diffusion ability. However, a high annealing temperature is required to remove the organic template, which may also collapse the structure of the functional materials. As a photocatalyst, the electron holes in the valence band of WO3 generated after UV irradiation exhibit a high oxidation activity and can degrade organic materials. Here, nanoporous WO3 films with pore sizes ranging from 10 to 16 nm were prepared through sol–gel methods with poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (P123) as an organic template and WO3 as a photocatalytic assistant after UV radiation treatment in a low-temperature environment. After UV degradation treatment, P123 was suitably removed, and the orthorhombic structure of the WO3 film was notably preserved. WO3 could promote the ultraviolet (UV) degradation process of templates. The prepared WO3 nanoporous film exhibited a good thermal stability, fast coloring/bleaching and an excellent cycling performance after annealing at 200 °C. Thermal insulation experiments verified that gasochromic windows with nanoporous films achieve a high energy-saving potential.

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“…The difference in the transmittance between the colored and bleached states (Δ T c‑b ) of an as-prepared film can exceed 70% without any cracking . However, during heat treatment at 100 °C, films will completely lose their gasochromic speed. , WO 3 /polymer sols are prepared from composites of WO 3 sols and copolymers, such as polystyrene- b -polyacrylic acid (PS- b -PAA) or poly(ethylene glycol)- block -poly(propylene glycol)- block -poly(ethylene glycol) F127 . The as-obtained films exhibit a mesoporous structure and high thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

Xue

Wang

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Although smart energy-saving windows, such as electrochromic, thermochromic, and gasochromic windows, show promising applications, they are still being delayed due to the lack of suitable methods for large-area manufacturing. To meet the demands of low cost and fast fabrication, printing methods have been widely studied for electrochromic film deposition. However, hydrogen diffusion depends on the porosity of gasochromic films, which renders the use of usual printing inks impracticable. In this study, a novel kind of WO3/SiO2 ink with suitable rheological characteristics for gasochromic windows was developed by prehydrolyzing and condensing SiO2 in a neutral solution. The kinetics were explored using nuclear magnetic resonance and density functional theory, indicating that the SiO2 growth directions can be controlled at various pH values. The prehydrolysis of SiO2 in a neutral solution exhibits adequate mechanical robustness, suitable rheological characteristics, and stable thermodynamics. Based on the prehydrolysis of SiO2 sol, porous SiO2 skeletons supporting WO3 gasochromic films were synthesized by using automated printing methods, which exhibit a high transmittance of 90%, a high solar energy shielding property of 84%, and good annealing stability at 150 °C. In actual energy-saving tests, the as-prepared gasochromic windows show a much slower rate of increase in room temperature compared to normal windows.

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Flexible gasochromic films with favorable high temperature resistance and energy efficiency

Cited by 18 publications

References 29 publications

Simulation of daylight in buildings with curved facades for rational use of solar energy

Simulation of daylight in buildings with curved facades for rational use of solar energy

Nanoporous WO₃ Gasochromic Films for Gas Sensing

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

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Flexible gasochromic films with favorable high temperature resistance and energy efficiency

Cited by 18 publications

References 29 publications

Simulation of daylight in buildings with curved facades for rational use of solar energy

Simulation of daylight in buildings with curved facades for rational use of solar energy

Nanoporous WO3 Gasochromic Films for Gas Sensing

Highly Thermally Stable and Transparent WO3–SiO2 Gasochromic Films Obtained by an Automated Printing Method

Contact Info

Product

Resources

About

Nanoporous WO₃ Gasochromic Films for Gas Sensing

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method