Zhu Long, Shim Jongmin, Huang Yulong, Armstrong Jason N, Meng Taotao, Ren Shenqiang
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States.
Department of Civil, Structural and Environmental Engineering, University at Buffalo, Buffalo, New York 14260, United States.
ACS Appl Mater Interfaces. 2024 Oct 9;16(40):54467-54474. doi: 10.1021/acsami.4c12012. Epub 2024 Sep 30.
Superinsulation aerogels are characterized by low tensile strength and brittleness due to their high porosity. To address these limitations, multiscale architectural design inspired by nacre can be employed. This materials design approach offers a promising strategy for enhancing the mechanical strength of aerogel thermal insulation. In this study, we present nacre-inspired multilayer cellulose-silica aerogel configurations. The cellulose "brick" network imparts structural strength to effectively redistribute energy, while the nanoporous "mortar" silica blocks heat transfer, maintaining insulation and fire retardance. The multilayer composites, with a layering configuration of five cellulose layers with four silica layers (5 + 4) and a cellulose layer thickness of 1.42 mm, exhibit a thermal conductivity of 31.3 mW/(m·K), a flexural modulus of 505 MPa, and an impact strength of 7.33 kJ/m. The hydrophobic composite shows a water contact angle of 127°, enhanced soundproofing with a 27% noise reduction, and a carbon footprint of 0.49 kgCOeq/kg. The multilayer cellulose-silica aerogel design provides a robust, eco-friendly thermal insulation solution for green building applications.
超级隔热气凝胶由于其高孔隙率而具有抗拉强度低和脆性的特点。为了解决这些局限性，可以采用受珍珠母启发的多尺度结构设计。这种材料设计方法为提高气凝胶隔热材料的机械强度提供了一种有前景的策略。在本研究中，我们展示了受珍珠母启发的多层纤维素 - 二氧化硅气凝胶结构。纤维素“砖块”网络赋予结构强度以有效重新分配能量，而纳米多孔“灰浆”二氧化硅则阻止热传递，保持隔热和阻燃性能。这种多层复合材料具有五层纤维素层和四层二氧化硅层（5 + 4）的分层结构，纤维素层厚度为1.42毫米，其热导率为31.3毫瓦/（米·开尔文），弯曲模量为505兆帕，冲击强度为7.33千焦/米。这种疏水复合材料的水接触角为127°，隔音效果增强，降噪27%，碳足迹为0.49千克二氧化碳当量/千克。多层纤维素 - 二氧化硅气凝胶设计为绿色建筑应用提供了一种坚固、环保的隔热解决方案。
