Abstract
Cellulose fibers play significant roles in building passive radiative cooling (PRC) and heating (PRH), benefiting from their porous structure and low thermal conductivity. However, the fixed structure and hydrophilic groups limit the regulation of optical and thermal properties. Herein, mechanically assisted solvent extraction strategy is proposed to regenerate cellulose acetate (CA) as pea-pod-like fibers. Different from natural fibers, photonic and thermal-storage particles are introduced into CA fibers to regulate optical selectivity and thermal properties. Further considering of building surface assembly, the biomimetic fibers are compressed into rigid bio-boards to achieve buildings thermal regulation. The results demonstrate that PRC bio-board can reflect ~ 94% of solar radiation and emit ~ 96% of thermal radiation and achieve ~ 11 ℃ (Isolar > 1500 W/m2 and Tenvironment ~ 35 ℃ at daytime) and 6 ℃ (nighttime) of cooling effects. The phase-change PRH bio-board integrates solar absorption (Asolar ~ 96%), thermal insulation (Tshielding ~ 30 ℃) and storage functions, which can heat building ~ 12 ℃ under Isolar ~ 1000 W/m2 and slowly releases heat for > 1200 s. According to evaluation, the bio-units can save over 45% of energy, 1.042 $/m2 cost and 4.978 kg/(m2 year) CO2 emission in Nan**g annually. It is believed that the results have positive effects on clarifying the structure–effect relationship and promoting the commercialization of thermal management materials.
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Acknowledgements
The work thanks for the supporting of the National Nature Science Foundation of China (52173158), National Natural Science Foundation of China (32171725) and Graduate Research and Innovation Projects of Jiangsu Province (KYCX21_0091). The authors thanks for the FDTD solutions provided by the Southeast University (China). This work is jointly completed by the corresponding author and co-authors, and no artificial intelligence (AI) participates in the process.
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SF conceptualization, methodology, software, investigation, formal analysis, writing-original draft; LY methodology, software, writing-original draft; MF investigation, formal analysis; HC measurements, investigation, performance evaluation; XH investigation, performance evaluation; MH conceptualization, funding acquisition, resources, supervision; XB supervision, writing-review and editing; YH supervision, writing-review and editing; YZ conceptualization, funding acquisition, resources, supervision, writing-review and editing.
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Feng, S., Yao, L., Feng, M. et al. Regeneration of Pea-Pod-Like Cellulose Acetate Fibers as Aerogel-Derived Boards for Building Thermal Regulation and Carbon Reduction. Adv. Fiber Mater. 6, 570–582 (2024). https://doi.org/10.1007/s42765-024-00377-w
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DOI: https://doi.org/10.1007/s42765-024-00377-w