Zhou Peng, Jiang Guangyang, Wang Yuyan, Tian Yongqiang, Zhang Xinxing
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China.
College of Biomass Science and Engineering of Sichuan University, Chengdu, 610065, China.
Nat Commun. 2025 Apr 22;16(1):3791. doi: 10.1038/s41467-025-59259-3.
Self-adaptive thermal management over large areas is highly attractive since single-mode radiative cooling materials lead to undesired overcooling. However, it remains a challenge that dual-mode switchable materials require artificial stimuli or additional energy for switching between heating and cooling modes. Here, different from dual-mode switching materials driven by artificial stimuli or additional energy, we propose an autonomously self-adaptive dual-modal coating with assembled micro-heterostructures that can engender the multistage scattering of incident light. The resultant coating demonstrates 92% solar reflectivity and 93% emissivity in hot condition. More significantly, the coating reaches 60% visible light optical modulation, which is attributed to the formation and disruption of the conjugation region in the chromogenic molecules, to prevent overcooling in cold condition. A thermal-switchable fabric is further fabricated via large-area spraying processes, demonstrating 2.5 °C warmer in cold condition and 8.7 °C cooler in hot condition compared to white samples. The coating highlights the importance of the large-scale manufacturing of temperature-adaptive materials, providing insights into the application of dynamic radiative cooling in garment, camping, building and other fields.
大面积自适应热管理极具吸引力，因为单模辐射冷却材料会导致不期望的过冷现象。然而，双模可切换材料在加热和冷却模式之间切换需要人工刺激或额外能量，这仍然是一个挑战。在此，不同于由人工刺激或额外能量驱动的双模切换材料，我们提出了一种具有组装微异质结构的自主自适应双模态涂层，该结构可引起入射光的多级散射。所得涂层在高温条件下显示出92%的太阳反射率和93%的发射率。更重要的是，该涂层实现了60%的可见光光学调制，这归因于发色分子中共轭区域的形成和破坏，以防止在寒冷条件下过冷。通过大面积喷涂工艺进一步制备了一种热可切换织物，与白色样品相比，在寒冷条件下温度高2.5°C，在高温条件下温度低8.7°C。该涂层突出了温度自适应材料大规模制造的重要性，为动态辐射冷却在服装、露营、建筑等领域的应用提供了见解。
