PDMS with porous PMMA dual-layer coating for passive daytime radiative cooling

Di Ci Kang; To Yu Wang; Duo Syuan Lin; Ying Shuo Cheng; Chao Wei Huang

doi:10.1016/j.solmat.2024.113380

PDMS with porous PMMA dual-layer coating for passive daytime radiative cooling

Di Ci Kang, To Yu Wang, Duo Syuan Lin, Ying Shuo Cheng, Chao Wei Huang

Department of Engineering Science

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Passive daytime radiative cooling (PDRC) presents a sustainable cooling technology that operates without energy consumption, by radiating heat through the atmospheric window into space (around 3 K). In this study, a novel PDRC coating was developed using a phase separation approach combined with a straightforward blade-coating method. The dual-layer coating comprises a porous poly(methylmethacrylate) (P-PMMA) layer, which enhances solar radiation scattering, and a polydimethylsiloxane (PDMS) layer, which improves infrared emissivity and imparts hydrophobicity (contact angle of 121.13°). The PDMS/P-PMMA coating achieved solar reflectance of 96.7 %, emissivity of 94.5 %, and theoretical radiative cooling powers of 77.28 W/m² during daytime and 120.66 W/m² at night. Under indoor and outdoor conditions, the coating reduced temperatures by 15 °C and 6.7 °C, respectively, compared with the chamber environment. Additionally, outdoor stability and dirt resistance tests confirmed the scalability, cost-effectiveness, and practicality of this coating for sub-ambient cooling applications.

Original language	English
Article number	113380
Journal	Solar Energy Materials and Solar Cells
Volume	282
DOIs	https://doi.org/10.1016/j.solmat.2024.113380
Publication status	Published - 2025 Apr

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.solmat.2024.113380

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title = "PDMS with porous PMMA dual-layer coating for passive daytime radiative cooling",

abstract = "Passive daytime radiative cooling (PDRC) presents a sustainable cooling technology that operates without energy consumption, by radiating heat through the atmospheric window into space (around 3 K). In this study, a novel PDRC coating was developed using a phase separation approach combined with a straightforward blade-coating method. The dual-layer coating comprises a porous poly(methylmethacrylate) (P-PMMA) layer, which enhances solar radiation scattering, and a polydimethylsiloxane (PDMS) layer, which improves infrared emissivity and imparts hydrophobicity (contact angle of 121.13°). The PDMS/P-PMMA coating achieved solar reflectance of 96.7 %, emissivity of 94.5 %, and theoretical radiative cooling powers of 77.28 W/m2 during daytime and 120.66 W/m2 at night. Under indoor and outdoor conditions, the coating reduced temperatures by 15 °C and 6.7 °C, respectively, compared with the chamber environment. Additionally, outdoor stability and dirt resistance tests confirmed the scalability, cost-effectiveness, and practicality of this coating for sub-ambient cooling applications.",

author = "Kang, {Di Ci} and Wang, {To Yu} and Lin, {Duo Syuan} and Cheng, {Ying Shuo} and Huang, {Chao Wei}",

note = "Publisher Copyright: {\textcopyright} 2024 Elsevier B.V.",

year = "2025",

month = apr,

doi = "10.1016/j.solmat.2024.113380",

language = "English",

volume = "282",

journal = "Solar Energy Materials and Solar Cells",

issn = "0927-0248",

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TY - JOUR

T1 - PDMS with porous PMMA dual-layer coating for passive daytime radiative cooling

AU - Kang, Di Ci

AU - Wang, To Yu

AU - Lin, Duo Syuan

AU - Cheng, Ying Shuo

AU - Huang, Chao Wei

PY - 2025/4

Y1 - 2025/4

N2 - Passive daytime radiative cooling (PDRC) presents a sustainable cooling technology that operates without energy consumption, by radiating heat through the atmospheric window into space (around 3 K). In this study, a novel PDRC coating was developed using a phase separation approach combined with a straightforward blade-coating method. The dual-layer coating comprises a porous poly(methylmethacrylate) (P-PMMA) layer, which enhances solar radiation scattering, and a polydimethylsiloxane (PDMS) layer, which improves infrared emissivity and imparts hydrophobicity (contact angle of 121.13°). The PDMS/P-PMMA coating achieved solar reflectance of 96.7 %, emissivity of 94.5 %, and theoretical radiative cooling powers of 77.28 W/m2 during daytime and 120.66 W/m2 at night. Under indoor and outdoor conditions, the coating reduced temperatures by 15 °C and 6.7 °C, respectively, compared with the chamber environment. Additionally, outdoor stability and dirt resistance tests confirmed the scalability, cost-effectiveness, and practicality of this coating for sub-ambient cooling applications.

AB - Passive daytime radiative cooling (PDRC) presents a sustainable cooling technology that operates without energy consumption, by radiating heat through the atmospheric window into space (around 3 K). In this study, a novel PDRC coating was developed using a phase separation approach combined with a straightforward blade-coating method. The dual-layer coating comprises a porous poly(methylmethacrylate) (P-PMMA) layer, which enhances solar radiation scattering, and a polydimethylsiloxane (PDMS) layer, which improves infrared emissivity and imparts hydrophobicity (contact angle of 121.13°). The PDMS/P-PMMA coating achieved solar reflectance of 96.7 %, emissivity of 94.5 %, and theoretical radiative cooling powers of 77.28 W/m2 during daytime and 120.66 W/m2 at night. Under indoor and outdoor conditions, the coating reduced temperatures by 15 °C and 6.7 °C, respectively, compared with the chamber environment. Additionally, outdoor stability and dirt resistance tests confirmed the scalability, cost-effectiveness, and practicality of this coating for sub-ambient cooling applications.

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DO - 10.1016/j.solmat.2024.113380

M3 - Article

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SN - 0927-0248

VL - 282

JO - Solar Energy Materials and Solar Cells

JF - Solar Energy Materials and Solar Cells

M1 - 113380

ER -

PDMS with porous PMMA dual-layer coating for passive daytime radiative cooling

Abstract

All Science Journal Classification (ASJC) codes

UN SDGs

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