Sustainable and Inexpensive Polydimethylsiloxane Sponges for Daytime Radiative Cooling

Zhou, Lyu; Rada, Jacob; Zhang, Huafan; Song, Haomin; Mirniaharikandi, Seyededriss; Ooi, Boon S.; Gan, Qiaoqiang

doi:10.1002/advs.202102502

Sustainable and Inexpensive Polydimethylsiloxane Sponges for Daytime Radiative Cooling

Journal Article · Wed Oct 20 00:00:00 EDT 2021 · Advanced Science

DOI:https://doi.org/10.1002/advs.202102502· OSTI ID:1831812

^[1]; Rada, Jacob ^[2]; Zhang, Huafan ^[3]; Song, Haomin ^[2]; Mirniaharikandi, Seyededriss ^[2]; Ooi, Boon S. ^[3]; ^[2]

State Univ. of New York at Buffalo, NY (United States); The State University of New York at Buffalo, NY, United States
State Univ. of New York at Buffalo, NY (United States)
King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)

Radiative cooling is an emerging cooling technology that can passively release heat to the environment. To obtain a subambient cooling effect during the daytime, chemically engineered structural materials are widely explored to simultaneously reject sunlight and preserve strong thermal emission. However, many previously reported fabrication processes involve hazardous chemicals, which can hinder a material’s ability to be mass produced. In order to eliminate the hazardous chemicals used in the fabrication of previous works, this article reports a white polydimethylsiloxane (PDMS) sponge fabricated by a sustainable process using microsugar templates. By substituting the chemicals for sugar, the manufacturing procedure produces zero toxic waste and can also be endlessly recycled via methods widely used in the sugar industry. The obtained porous PDMS exhibits strong visible scattering and thermal emission, resulting in an efficient temperature reduction of 4.6 °C and cooling power of 43 W m^–2 under direct solar irradiation. In addition, due to the air-filled voids within the PDMS sponge, its thermal conductivity remains low at 0.06 W (m K)^–1. This unique combination of radiative cooling and thermal insulation properties can efficiently suppress the heat exchange with the solar-heated rooftop or the environment, representing a promising future for new energy-efficient building envelope material.

View Accepted Manuscript (DOE)

Research Organization:: State Univ. of New York at Buffalo, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: FE0031960

OSTI ID:: 1831812

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 23 Vol. 8; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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