Sarkar Arpita, Zhu Long, Petit Donald, Islam Abdullah, Guo Zipeng, Zhou Chi, Armstrong Jason N, Ren Shenqiang
Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.
These authors contributed equally.
Cell Rep Phys Sci. 2024 Oct 16;5(10). doi: 10.1016/j.xcrp.2024.102222. Epub 2024 Sep 27.
The massive use of carbon-sequestration building materials promises a potential global carbon sink in decarbonizing the building industry. Renewable biogenic materials from abundant agriculture waste for building practice have been around over thousands of years. However, in addition to their flammability and moisture problems, addressing their low thermal and structural performance is also becoming indispensable and urgent when it comes to environmentally sustainable and energy-efficient buildings. Here, we report a nature-inspired biogenic gradient insulation composite with an optimized silica concentration of 30 wt %, a density of 0.246 g/cm, and a porosity of 86%. The gradient hybrid composite exhibits a thermal conductivity of 28.2 mW m K, which is the lowest achieved under optimal preparation conditions. It also shows a flexural modulus of 590 MPa for the aerogel-rich layer without surface modification, and it demonstrates superior fire retardancy and superhydrophobicity after surface treatment.
大量使用碳固存建筑材料有望在建筑行业脱碳方面形成一个潜在的全球碳汇。数千年来，来自丰富农业废弃物的可再生生物源材料一直被用于建筑实践。然而，除了其易燃性和防潮问题外，在实现环境可持续和节能建筑方面，解决其低热性能和结构性能问题也变得不可或缺且紧迫。在此，我们报告一种受自然启发的生物源梯度隔热复合材料，其优化的二氧化硅浓度为30 wt%，密度为0.246 g/cm，孔隙率为86%。该梯度混合复合材料的热导率为28.2 mW m K，这是在最佳制备条件下所达到的最低值。对于未经表面改性的富含气凝胶的层，其弯曲模量为590 MPa，并且在表面处理后表现出优异的阻燃性和超疏水性。
