Switchable surface coating for bifunctional passive radiative cooling and solar heating

The ability to achieve dual-mode thermal regulation for switchable heating and cooling on a single platform has thus far been challenged by the availability of suitable materials. The materials need to possess both high solar reflectance and high transmittance, necessitating large and small thicknes...

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Main Authors: Fei, Jipeng, Han, Di, Ge, Junyu, Wang, Xingli, Koh, See Wee, Gao, Shubo, Sun, Zixu, Wan, Man Pun, Ng, Bing Feng, Cai, Lili, Li, Hong
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/162178
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1621782022-10-07T06:33:07Z Switchable surface coating for bifunctional passive radiative cooling and solar heating Fei, Jipeng Han, Di Ge, Junyu Wang, Xingli Koh, See Wee Gao, Shubo Sun, Zixu Wan, Man Pun Ng, Bing Feng Cai, Lili Li, Hong School of Mechanical and Aerospace Engineering School of Electrical and Electronic Engineering CNRS International NTU THALES Research Alliances Engineering::Mechanical engineering Hierarchical Porous Structures Optical Regulation The ability to achieve dual-mode thermal regulation for switchable heating and cooling on a single platform has thus far been challenged by the availability of suitable materials. The materials need to possess both high solar reflectance and high transmittance, necessitating large and small thicknesses in the same coating layer, respectively (i.e., the thickness constraint). Herein, for the first time, a single-layer coating made in a facile one-step process is reported, which exhibits rapid switch between high solar reflection (≈96.6%) and high solar transmission (≈86.6%). In the dry state, high solar reflectance and infrared (IR) emittance (>96% from 8 to 13 µm) enable passive radiative cooling, resulting in all-day near/sub-ambient temperatures in the demanding weather conditions of the tropical climate. Upon wetting, high transparency in the broadband range (0.3–2.5 µm) allows solar heating, leading to switchable thermal regulation. Such unprecedented performances are achieved through a unique hierarchical porous structure comprising of vertically aligned microscale pores in nanoscale pore matrix. This structure breaks the thickness constraint and broadens its applicability, in particular for seasonal areas with large temperature variation throughout the day. Ministry of Education (MOE) Nanyang Technological University This work was supported by Nanyang Technological University under NAP award (M408050000) and Singapore Ministry of Education Tier 1 program (RG58/21 & RG97/18 (S). 2022-10-07T06:33:07Z 2022-10-07T06:33:07Z 2022 Journal Article Fei, J., Han, D., Ge, J., Wang, X., Koh, S. W., Gao, S., Sun, Z., Wan, M. P., Ng, B. F., Cai, L. & Li, H. (2022). Switchable surface coating for bifunctional passive radiative cooling and solar heating. Advanced Functional Materials, 32(27), 2203582-. https://dx.doi.org/10.1002/adfm.202203582 1616-301X https://hdl.handle.net/10356/162178 10.1002/adfm.202203582 2-s2.0-85129479130 27 32 2203582 en M408050000 RG58/21 RG97/18 (S) Advanced Functional Materials © 2022 Wiley-VCH GmbH. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Hierarchical Porous Structures
Optical Regulation
spellingShingle Engineering::Mechanical engineering
Hierarchical Porous Structures
Optical Regulation
Fei, Jipeng
Han, Di
Ge, Junyu
Wang, Xingli
Koh, See Wee
Gao, Shubo
Sun, Zixu
Wan, Man Pun
Ng, Bing Feng
Cai, Lili
Li, Hong
Switchable surface coating for bifunctional passive radiative cooling and solar heating
description The ability to achieve dual-mode thermal regulation for switchable heating and cooling on a single platform has thus far been challenged by the availability of suitable materials. The materials need to possess both high solar reflectance and high transmittance, necessitating large and small thicknesses in the same coating layer, respectively (i.e., the thickness constraint). Herein, for the first time, a single-layer coating made in a facile one-step process is reported, which exhibits rapid switch between high solar reflection (≈96.6%) and high solar transmission (≈86.6%). In the dry state, high solar reflectance and infrared (IR) emittance (>96% from 8 to 13 µm) enable passive radiative cooling, resulting in all-day near/sub-ambient temperatures in the demanding weather conditions of the tropical climate. Upon wetting, high transparency in the broadband range (0.3–2.5 µm) allows solar heating, leading to switchable thermal regulation. Such unprecedented performances are achieved through a unique hierarchical porous structure comprising of vertically aligned microscale pores in nanoscale pore matrix. This structure breaks the thickness constraint and broadens its applicability, in particular for seasonal areas with large temperature variation throughout the day.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Fei, Jipeng
Han, Di
Ge, Junyu
Wang, Xingli
Koh, See Wee
Gao, Shubo
Sun, Zixu
Wan, Man Pun
Ng, Bing Feng
Cai, Lili
Li, Hong
format Article
author Fei, Jipeng
Han, Di
Ge, Junyu
Wang, Xingli
Koh, See Wee
Gao, Shubo
Sun, Zixu
Wan, Man Pun
Ng, Bing Feng
Cai, Lili
Li, Hong
author_sort Fei, Jipeng
title Switchable surface coating for bifunctional passive radiative cooling and solar heating
title_short Switchable surface coating for bifunctional passive radiative cooling and solar heating
title_full Switchable surface coating for bifunctional passive radiative cooling and solar heating
title_fullStr Switchable surface coating for bifunctional passive radiative cooling and solar heating
title_full_unstemmed Switchable surface coating for bifunctional passive radiative cooling and solar heating
title_sort switchable surface coating for bifunctional passive radiative cooling and solar heating
publishDate 2022
url https://hdl.handle.net/10356/162178
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