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10.3390/ma19071344
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Article

Waste Glass-Derived Hierarchically Porous All-Inorganic Coatings for Sustainable Daytime Radiative Cooling

by
Jiale Wang
1,
Haiyang Chen
1,2,3,*,
Weisu Weng
1,
Wanfei Zhang
4,
Boyu Qiao
4,
Yu Xia
4,
Yufan Liu
1,
Ke Zhang
1,
Mengyuan Du
1,
Gaoxiang Ye
1,
Jie Yan
1 and
Bin Li
5,*
1
School of Civil and Engineering, Hebei University of Architecture, Zhangjiakou 075000, China
2
Hebei Key Laboratory of Diagnosis, Reconstruction and Anti-Disaster of Civil Engineering, Zhangjiakou 075000, China
3
Hebei Collaborative Innovation Center of Green Buildings, Zhangjiakou 075000, China
4
Zhangjiakou Aocheng Investment Management Co., Ltd., Zhangjiakou 075000, China
5
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Materials 2026, 19(7), 1344; https://doi.org/10.3390/ma19071344
Submission received: 6 March 2026 / Revised: 24 March 2026 / Accepted: 26 March 2026 / Published: 28 March 2026
(This article belongs to the Special Issue Preparation and Mechanical Properties of Ceramics)
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Abstract

Passive daytime radiative cooling (PDRC) is a promising thermal management technology, yet its widespread application is hindered by the high production costs and poor durability of traditional organic-based materials. Here, we presented a hierarchically porous, all-inorganic PDRC coating synthesized from industrial waste glass and alumina microparticles via low-temperature (600 °C) processing. Rather than serving merely as a cheap substitute, the alkali oxides inherent in waste glass act as natural fluxes, enabling partial melting. Concurrently, the steric hindrance of alumina restricts full densification, spontaneously constructing a highly scattering random photonic network. The optimized composite (50 wt.% waste glass/50 wt.% alumina) achieves 96% solar reflectance and 95% atmospheric window emittance. Field tests confirmed sub-ambient cooling of ~4.0 °C (day) and ~4.5 °C (night), yielding a peak net cooling power of 108.1 W/m2. Accelerated weathering and thermal shock (1000 °C) tests demonstrated sustained optical stability under extreme environmental stress.
Keywords: passive daytime radiative cooling; waste glass upcycling; hierarchically porous network; all-inorganic coatings passive daytime radiative cooling; waste glass upcycling; hierarchically porous network; all-inorganic coatings

Share and Cite

MDPI and ACS Style

Wang, J.; Chen, H.; Weng, W.; Zhang, W.; Qiao, B.; Xia, Y.; Liu, Y.; Zhang, K.; Du, M.; Ye, G.; et al. Waste Glass-Derived Hierarchically Porous All-Inorganic Coatings for Sustainable Daytime Radiative Cooling. Materials 2026, 19, 1344. https://doi.org/10.3390/ma19071344

AMA Style

Wang J, Chen H, Weng W, Zhang W, Qiao B, Xia Y, Liu Y, Zhang K, Du M, Ye G, et al. Waste Glass-Derived Hierarchically Porous All-Inorganic Coatings for Sustainable Daytime Radiative Cooling. Materials. 2026; 19(7):1344. https://doi.org/10.3390/ma19071344

Chicago/Turabian Style

Wang, Jiale, Haiyang Chen, Weisu Weng, Wanfei Zhang, Boyu Qiao, Yu Xia, Yufan Liu, Ke Zhang, Mengyuan Du, Gaoxiang Ye, and et al. 2026. "Waste Glass-Derived Hierarchically Porous All-Inorganic Coatings for Sustainable Daytime Radiative Cooling" Materials 19, no. 7: 1344. https://doi.org/10.3390/ma19071344

APA Style

Wang, J., Chen, H., Weng, W., Zhang, W., Qiao, B., Xia, Y., Liu, Y., Zhang, K., Du, M., Ye, G., Yan, J., & Li, B. (2026). Waste Glass-Derived Hierarchically Porous All-Inorganic Coatings for Sustainable Daytime Radiative Cooling. Materials, 19(7), 1344. https://doi.org/10.3390/ma19071344

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