Cost-effective, simple patterned PDMS/h-BN passive daytime radiative cooling film with durability and self-cleaning dual-function
Liu J. Zhang Z. Zhang N. Zhao Q. Memon S.A. Yuan Y.
June 2025Elsevier Ltd
Materials Today Communications
2025#46
Passive daytime radiative cooling is an emerging technology with a superior ability to transfer heat to outer space. It can achieve sub-ambient temperatures without additional energy consumption. The development of radiative cooling materials with multi-functions of durability, self-cleaning, and high efficiency remains a challenge to the application in buildings. This paper presents an innovative polymer-based radiative cooling film through polydimethylsiloxane (PDMS) incorporated with hexagonal boron nitride nanosheets (h-BN), followed by surface pattering employing a templating method to create rectangular mesh structures. This study investigates the effects of h-BN particle size, h-BN concentration, film thickness, and surface patterning on the radiative cooling performance. Results indicate that the optimized PDMS/h-BN film demonstrates exceptional properties with 94.5 % solar reflectance and 0.911 infrared emittance, coupled with superhydrophobicity (water contact angle of 150.2°) that ensures effective self-cleaning for sustained cooling efficiency. The PDMS/h-BN film reduces the temperature by approximately 5.24 °C under direct sunlight (average solar irradiance of about 952 W/m²). The film shows excellent resistance to ultraviolet aging, chemical exposure, and mechanical abrasion, which benefits its durability and cooling performance. Overall, the obtained cost-effective, simple patterned PDMS/h-BN film can be a candidate technology for building energy conservation applications.
Durability , Hexagonal boron nitride nanosheet , Radiative cooling , Self-cleaning , Spectral modulation
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School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China
School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana, 010000, Kazakhstan
School of Mechanical Engineering
School of Engineering and Digital Sciences
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