scholarly journals Colored and paintable bilayer coatings with high solar-infrared reflectance for efficient cooling

2020 ◽  
Vol 6 (17) ◽  
pp. eaaz5413 ◽  
Author(s):  
Yijun Chen ◽  
Jyotirmoy Mandal ◽  
Wenxi Li ◽  
Ajani Smith-Washington ◽  
Cheng-Chia Tsai ◽  
...  
Keyword(s):  
Short Wavelength ◽  
Solar Heating ◽  
Radiative Cooling ◽  
Infrared Reflectance ◽  
Bilayer Coating ◽  
Visible Wavelengths ◽  
Absorptive Layer ◽  
Bilayer Coatings

Solar reflective and thermally emissive surfaces offer a sustainable way to cool objects under sunlight. However, white or silvery reflectance of these surfaces does not satisfy the need for color. Here, we present a paintable bilayer coating that simultaneously achieves color and radiative cooling. The bilayer comprises a thin, visible-absorptive layer atop a nonabsorptive, solar-scattering underlayer. The top layer absorbs appropriate visible wavelengths to show specific colors, while the underlayer maximizes the reflection of near-to-short wavelength infrared (NSWIR) light to reduce solar heating. Consequently, the bilayer attains higher NSWIR reflectance (by 0.1 to 0.51) compared with commercial paint monolayers of the same color and stays cooler by as much as 3.0° to 15.6°C under strong sunlight. High NSWIR reflectance of 0.89 is realized in the blue bilayer. The performances show that the bilayer paint design can achieve both color and efficient radiative cooling in a simple, inexpensive, and scalable manner.

scholarly journals Adaptive covers for combined radiative cooling and solar heating. A review of existing technology and materials

2021 ◽  
Vol 230 ◽  
pp. 111275
Author(s):  
Roger Vilà ◽  
Ingrid Martorell ◽  
Marc Medrano ◽  
Albert Castell
Keyword(s):  
Solar Heating ◽  
Radiative Cooling

scholarly journals Hybrid concentrated radiative cooling and solar heating in a single system

2021 ◽  
Vol 2 (2) ◽  
pp. 100338
Author(s):  
Lyu Zhou ◽  
Haomin Song ◽  
Nan Zhang ◽  
Jacob Rada ◽  
Matthew Singer ◽  
...  
Keyword(s):  
Solar Heating ◽  
Radiative Cooling ◽  
Single System

Modeling of contact-induced radial cracking in ceramic bilayer coatings on compliant substrates

2003 ◽  
Vol 18 (5) ◽  
pp. 1275-1283 ◽  
Author(s):  
Chun-Hway Hsueh ◽  
Pedro Miranda
Keyword(s):  
Flexural Rigidity ◽  
Ceramic Coatings ◽  
Analytical Expression ◽  
Bilayer Coating ◽  
Compliant Substrates ◽  
Dental Crowns ◽  
Plates On Elastic Foundation ◽  
Radial Cracks ◽  
Good Agreement ◽  
Bilayer Coatings

Contact-induced radial cracking in ceramic coatings on compliant substrates was analyzed recently. Radial cracks initiate at the coating/substrate interface beneath the contact where maximum flexural tension occurs, and an analytical expression for the onset of radial cracking in monolayer coatings was formulated on the basis of the classical solution for flexing plates on elastic foundation. In the present study, the analytical expression was derived for the case of ceramic bilayer coatings on compliant substrates, which have significant applications in the structure of dental crowns. It was found that the analytical solution for bilayer-coating/substrate systems can be obtained from that of monolayer-coating/substrate systems by replacing the neutral surface position and the flexural rigidity of monolayer coating with those of bilayer coating. The predicted critical loads for initiating radial cracking were found to be in good agreement with existing measurements and finite element results for glass/alumina, glass/glass-ceramic, and glass/Y2O3-stabilized ZrO2polycrystal bilayers on polycarbonate substrates. Limitations of the present analysis are discussed.

scholarly journals Comparative analysis of different surfaces for integrated solar heating and radiative cooling: A numerical study

Energy ◽  
2018 ◽  
Vol 155 ◽  
pp. 360-369 ◽  
Author(s):  
Mingke Hu ◽  
Bin Zhao ◽  
Xianze Ao ◽  
Yuehong Su ◽  
Yunyun Wang ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Numerical Study ◽  
Solar Heating ◽  
Radiative Cooling

scholarly journals Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

2018 ◽  
Vol 10 (9) ◽  
pp. 3049 ◽  
Author(s):  
Roxana Family ◽  
M. Mengüç
Keyword(s):  
Heat Transfer ◽  
Emission Spectra ◽  
Spectral Emissivity ◽  
Volumetric Analysis ◽  
Solar Heating ◽  
Heat Transfer Analysis ◽  
Surface Phenomenon ◽  
Radiative Cooling ◽  
Atmospheric Window ◽  
Building Surfaces

The main goal of this paper is to explore the radiative cooling and solar heating potential of several materials for the built environment, based on their spectrally-selective properties. A material for solar heating, should have high spectral emissivity/absorptivity in the solar radiation band (within the wavelength range of 0.2–2 μm), and low emissivity/absorptivity at longer wavelengths. Radiative cooling applications require high spectral emissivity/absorptivity, within the atmospheric window band (8–13 μm), and a low emissivity/absorptivity in other bands. UV-Vis spectrophotometer and FTIR spectroscopy, are used to measure, the spectral absorption/emission spectra of six different types of materials. To evaluate the radiative cooling potential of the samples, the power of cooling is calculated. Heat transfer through most materials is not just a surface phenomenon, but it also needs a volumetric analysis. Therefore, a coupled radiation and conduction heat transfer analysis is used. Results are discussed for the selection of the best materials, for different applications on building surfaces.

scholarly journals Microflower like Zinc Oxide/Cerium, Lanthanum Substituted Hydroxyapatite Bilayer Coating on Surgical Grade Stainless Steel for Corrosion Resistance, Antibacterial and Bioactive Properties

2020 ◽  
Vol 32 (4) ◽  
pp. 815-821 ◽  
Author(s):  
C. Sridevi ◽  
P. Karthikeyan ◽  
D. Dhivyapriya ◽  
L. Mitu ◽  
P. Maheswaran ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Impedance Analysis ◽  
Electrochemical Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bilayer Coating ◽  
In Vitro Antibacterial Activity ◽  
Ft Ir ◽  
Bilayer Coatings

The growing evidence of beneficial role of zinc in bone has increased the interest of developing zinc-containing biomaterials for medical applications and specifically biocompatible coatings that can be deposited on metallic implants to benefit from their load-bearing capabilities. In present work, zinc oxide/cerium, lanthanum substituted (ZnO/Ce,La-HAP) hydroxyapatite bilayer coatings have been fabricated by electrodeposition technique. As developed, ZnO/Ce,La-HAP bilayer coatings were then structurally, morphologically and chemically characterized using Fourier-transform infrared spectroscopy(FT-IR), X-ray diffraction (XRD), higher resolution scanning electron microscopy (HRSEM) and energy dispersive X-ray spectroscopy (EDAX). The properties of corrosion performance of 316L SS were explored in Ringers solution using electrochemical analysis. The potentiodynamic polarization and impedance analysis demonstrated that the anticorrosion behavior of 316L SS was significantly increased by the bilayer coating. Cell viability in vitro, antibacterial activity and live/dead assay of ZnO/Ce,La-HAP bilayer coating were investigated. Hence, development of ZnO/Ce,La-HAP bilayer coating on 316L SS to make it suitable for biomedical applications.

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