Xiong Feng, Zhou Jiawei, Jin Yongkang, Zhang Zitao, Qin Mulin, Han Haiwei, Shen Zhenghui, Han Shenghui, Geng Xiaoye, Jia Kaihang, Zou Ruqiang
Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing, China.
Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA.
Nat Commun. 2024 Aug 20;15(1):7125. doi: 10.1038/s41467-024-51530-3.
Improving thermal insulation is vital for addressing thermal protection and energy efficiency challenges. Though silica aerogel has a record-low thermal conductivity at ambient pressure, its high production cost, due to its nanoscale porous structure, has hindered its widespread use. In this study, we introduce a cost-effective and mild method that enhances insulation by incorporating phase change materials (PCMs) into a micron-porous framework. With a thermal conductivity at 0.041 W mK on par with conventional insulation materials, this PCMs aerogel presents additional advantages for thermal protection from transient high-temperature loads by effectively delaying heat propagation through heat absorption. Moreover, the PCMs aerogel remains stable under cyclic deformation and heating up to 300 °C and is self-extinguishing in the presence of fire. Our approach offers a promising alternative for affordable insulation materials with potential wide applications in thermal protection and energy conservation areas.
提高隔热性能对于应对热防护和能源效率挑战至关重要。尽管二氧化硅气凝胶在常压下具有创纪录的低导热率，但其由于纳米级多孔结构导致的高生产成本阻碍了其广泛应用。在本研究中，我们引入了一种经济高效且温和的方法，通过将相变材料（PCM）掺入微孔框架中来增强隔热性能。这种PCM气凝胶的导热率为0.041 W mK，与传统隔热材料相当，通过有效延迟热传播吸收热量，在瞬态高温负载的热防护方面具有额外优势。此外，PCM气凝胶在循环变形和高达300°C的加热条件下仍保持稳定，并且在有火的情况下会自行熄灭。我们的方法为价格合理的隔热材料提供了一个有前景的替代方案，在热防护和节能领域具有潜在的广泛应用。
