Template-Thermally Induced Phase Separation-Assisted Microporous Regulation in Poly(lactic acid) Aerogel for Sustainable Radiative Cooling

IF 5.4 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Biomacromolecules Pub Date : 2025-02-10 Epub Date: 2025-01-23 DOI:10.1021/acs.biomac.4c01515

Han Jia , Mulan Mu , Yangzhe Hou , Yamin Pan , Chuntai Liu , Changyu Shen , Xianhu Liu

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Abstract

Herein, an eco-friendly and degradable poly(lactic acid) aerogel was prepared by combining a poly(ethylene glycol) template material with thermally induced phase separation. Due to the tailored pore size introduced by the template material, the aerogel exhibits high solar reflectance (92.0%), excellent thermal emittance (90.5%), low thermal conductivity (52.0 mW m^–1 K^–1), and high compressive strength (0.15 MPa). Cooling tests demonstrate that the aerogel can achieve temperature drops of 3.7 °C during the day and of 6.2 °C at night. Furthermore, simulations of building cooling energy systems reveal that the aerogel can reduce energy consumption by 2.2 to 10.2 MJ m^–2 per year in various cities, achieving energy savings ranging from 8.2 to 24.3%. Meanwhile, the aerogel cooler demonstrates excellent self-cleaning performance (WCA = 149.1°) and cyclic compression performance. This research will promote the field of passive radiative cooling toward a greener and more sustainable direction.

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模板-热诱导相分离辅助聚乳酸气凝胶微孔调控的可持续辐射冷却。

本文将聚乙二醇模板材料与热诱导相分离相结合，制备了一种环保型、可降解的聚乳酸气凝胶。由于模板材料引入了量身定制的孔径，气凝胶具有高太阳反射率（92.0%），优异的热发射率（90.5%），低导热系数（52.0 mW m-1 K-1）和高抗压强度（0.15 MPa）。冷却试验表明，该气凝胶白天可实现3.7°C的降温，夜间可实现6.2°C的降温。此外，对建筑冷却能源系统的模拟表明，在各个城市，气凝胶每年可以减少2.2至10.2 MJ -2的能耗，实现8.2至24.3%的节能。同时，气凝胶冷却器具有良好的自清洁性能（WCA = 149.1°）和循环压缩性能。本研究将推动被动辐射冷却领域向更绿色、更可持续的方向发展。

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来源期刊

Biomacromolecules 化学-高分子科学

CiteScore

10.60

自引率

4.80%

发文量

417

审稿时长

1.6 months

期刊介绍： Biomacromolecules is a leading forum for the dissemination of cutting-edge research at the interface of polymer science and biology. Submissions to Biomacromolecules should contain strong elements of innovation in terms of macromolecular design, synthesis and characterization, or in the application of polymer materials to biology and medicine. Topics covered by Biomacromolecules include, but are not exclusively limited to: sustainable polymers, polymers based on natural and renewable resources, degradable polymers, polymer conjugates, polymeric drugs, polymers in biocatalysis, biomacromolecular assembly, biomimetic polymers, polymer-biomineral hybrids, biomimetic-polymer processing, polymer recycling, bioactive polymer surfaces, original polymer design for biomedical applications such as immunotherapy, drug delivery, gene delivery, antimicrobial applications, diagnostic imaging and biosensing, polymers in tissue engineering and regenerative medicine, polymeric scaffolds and hydrogels for cell culture and delivery.