Passive radiative cooling is a vital strategy for mitigating the greenhouse effect. However, the widespread use of synthetic plastics as the primary constituent raises environmental concerns of plastic waste. Addressing these challenges necessitates the development of radiative cooling materials based on natural and renewable resources . Herein, we utilize the abundant but underutilized poplar catkins, which are currently perceived as harmful, to fabricate a poplar catkin-derived (PC) film for radiative cooling. The PC film exhibits exceptional cooling performance, with a maximum cooling power of 75.3 W m −2 under an average sunlight intensity of 819 W m −2 . Remarkably, the PC film achieves a sub-ambient temperature reduction of 6.2 °C during 9:00–13:00, within a similar solar radiation intensity. Additionally, the PC film possesses outstanding properties, including UV resistance, mold resistance, and renewability. Even after multiple regeneration cycles, the film experiences only marginal decreases of 0.9 % in sunlight reflectance and 1.4 % in infrared emissivity (8–13 μm). Furthermore, the resulting film demonstrates superior resistance to mildew compared to wood, highlighting its potential for long-term usability. This work not only addresses the environmental concerns associated with synthetic plastics but also harnesses the untapped potential of readily available natural resources to develop sustainable radiative cooling materials.
Ma Chao,Wei Jie,Cao Pusen,Han Yilei,Zhang Shifeng,Chen Yuxia,Guo Yong
Soy protein adhesives have shown attractive potential across wood-based composite application as replacements for formaldehyde synthetic resins. However, the problems of poor cold-pressing bonding performance, mildew resistance, and flame retardancy are major bottlenecks preventing their widespread industrial use. Herein, a novel dual-bionic soybean meal (SM) adhesive was developed with excellent bonding performance inspired by the strong wet adhesion system of barnacles and mussels. Polydopamine (PDA) adopts for coating the silk fibroin (SF) via a facile in situ polymerization to form a functional SF/PDA (SPA), which acts as a hydrogen bond donor in adhesive system. Benefiting from abundant phenolic hydroxyl groups, multiple hydrogen bond cross-linked networks, and the removal of interfacial water, the adhesive generated a strong cold-pressing adhesion (771.0 kPa) and toughness (1.54 MJ/m 3 ), which respectively increased by 267.1% and 208.0% compared with SM adhesive. The introduction of borate further induces the formation of the dynamic cross-linked network along with supramolecular interactions in adhesive system, which demonstrated strong adhesion to different hydrophilic and hydrophobic substrates in the adhesive. Additionally, borate and phenol hydroxyl groups synergistically improved mildew resistance and flame retardancy in adhesives, which were stored for 20 days without mildew formation and showed combustion suppression behavior during combustion tests. The design of this bionic system offers a novel approach for developing high performance wood adhesives.
危险品化学品经营许可证（带存储）