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• W3158981569 abstract "Abstract Radiative cooling can cool objects on Earth without an energy input, which has drawn significant attention recently. While polymers have been widely studied for radiative cooling applications due to their promising infrared emission behaviors, ease of fabrication and low cost, the cooling performance of polymer coatings still needs to be enhanced through structure design. In this work, the effects of polymer materials, coating thicknesses and surface microstructures on the cooling performance of coatings were studied. Results showed that the PDMS coating can achieve a great radiative cooling ability with less materials consumption and the polymer coating can reach a relative high saturation value of thermal emittance ( <?CDATA ${bar varepsilon _{{text{LWIR}}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:msub> <mml:mover> <mml:mi>ε</mml:mi> <mml:mo>ˉ</mml:mo> </mml:mover> <mml:mrow> <mml:mrow> <mml:mtext>LWIR</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> ) in the atmosphere’s long-wave infrared transmission window (8–13 <?CDATA $mu{text{m}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>μ</mml:mi> <mml:mrow> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:math> ) with a large thickness, but interface reflectance in the wavelength range from 8 to 13 <?CDATA $mu {text{m}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>μ</mml:mi> <mml:mrow> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:math> limits the further enhancement of <?CDATA ${bar varepsilon _{{text{LWIR}}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:msub> <mml:mover> <mml:mi>ε</mml:mi> <mml:mo>ˉ</mml:mo> </mml:mover> <mml:mrow> <mml:mrow> <mml:mtext>LWIR</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> . By introducing a grating-pattern microstructure, the minimal reflectance at <?CDATA $lambda $?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>λ</mml:mi> </mml:math> <?CDATA $=$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo>=</mml:mo> </mml:math> 8–13 <?CDATA $mu{text{m}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>μ</mml:mi> <mml:mrow> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:math> was nearly zero and the low emittance region at <?CDATA $lambda $?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>λ</mml:mi> </mml:math> <?CDATA $=$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo>=</mml:mo> </mml:math> 9–11 <?CDATA $mu{text{m}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>μ</mml:mi> <mml:mrow> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:math> of the bare PDMS coating was greatly enhanced. At the coating thickness of t <?CDATA $=$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo>=</mml:mo> </mml:math> 200 <?CDATA ${text{m}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:math> , <?CDATA ${bar varepsilon _{{text{LWIR}}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:msub> <mml:mover> <mml:mi>ε</mml:mi> <mml:mo>ˉ</mml:mo> </mml:mover> <mml:mrow> <mml:mrow> <mml:mtext>LWIR</mml:mtext> </mml:mrow> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> and the net nighttime cooling power of the PDMS coating can reach 0.996 and 110.5 W m −2 , respectively, when the ambient temperature is 298.15 K. In addition, the solar reflectance of the PDMS coating can reach 0.946 using the Ag substrate, making it attractive for radiative cooling applications." @default.
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• W3158981569 date "2021-05-13" @default.
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• W3158981569 title "Enhancing infrared emission behavior of polymer coatings for radiative cooling applications" @default.
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