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Title: Switchable surface coating for bifunctional passive radiative cooling and solar heating
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
Keywords: Engineering::Mechanical engineering
Issue Date: 2022
Source: 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-.
Project: M408050000
RG97/18 (S)
Journal: Advanced Functional Materials
Abstract: 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.
ISSN: 1616-301X
DOI: 10.1002/adfm.202203582
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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