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<p>Passive daytime radiative cooling (PDRC) has emerged as a promising sustainable solution to address global energy demands and environmental challenges by dissipating heat into outer space without energy consumption. However, materials that have been used in PDRC are quite expensive or complicated to fabricate on a large scale. This study develops a low-cost, environmentally friendly PDRC composite material synthesized from agricultural waste: cellulose fibers from rice straw and silica particles from rice husk ash (RHA). The synthesis of silica particles was modified from previous work, resulting in high-purity amorphous silica particles with a controllable particle size. The composite sheets could be prepared by facile one-pot synthesis and exhibited nearly superhydrophobic properties with a water contact angle of up to 144°, facilitating self-cleaning capabilities. Optical characterization revealed a high solar reflectance of approximately 90% in the near-infrared (NIR) region and strong thermal emittance (80–95%) within the 8–13-μm atmospheric window. Field tests under clear sky conditions showed a significant cooling performance, achieving an initial temperature reduction of approximately 8&#xa0;°C compared to an uncovered control. In addition, the silica particles played a major role in infrared emissivity which increased as the particle size increased. These results highlight a scalable, bio-derived pathway for effective thermal management and agricultural waste valorization.</p>

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Sustainable Passive Radiative Cooling Composites Fabricated from Agricultural Wastes-Derived Cellulose and Silica Particles

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Komkrich Chokprasombat

摘要

Passive daytime radiative cooling (PDRC) has emerged as a promising sustainable solution to address global energy demands and environmental challenges by dissipating heat into outer space without energy consumption. However, materials that have been used in PDRC are quite expensive or complicated to fabricate on a large scale. This study develops a low-cost, environmentally friendly PDRC composite material synthesized from agricultural waste: cellulose fibers from rice straw and silica particles from rice husk ash (RHA). The synthesis of silica particles was modified from previous work, resulting in high-purity amorphous silica particles with a controllable particle size. The composite sheets could be prepared by facile one-pot synthesis and exhibited nearly superhydrophobic properties with a water contact angle of up to 144°, facilitating self-cleaning capabilities. Optical characterization revealed a high solar reflectance of approximately 90% in the near-infrared (NIR) region and strong thermal emittance (80–95%) within the 8–13-μm atmospheric window. Field tests under clear sky conditions showed a significant cooling performance, achieving an initial temperature reduction of approximately 8 °C compared to an uncovered control. In addition, the silica particles played a major role in infrared emissivity which increased as the particle size increased. These results highlight a scalable, bio-derived pathway for effective thermal management and agricultural waste valorization.