Dimensional upgrading of 0D silica nanospheres to 3D networking toward robust aerogels for fire resistance and low-carbon applications

IF 31.6 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0

Abstract

Over 40 % of global energy consumption is attributed to thermal regulation in buildings, highlighting the imperative for low-carbon structures. Aerogel insulation materials with low thermal conductivity show promise for energy-saving buildings. However, their widespread adoption is hindered by inadequate mechanical robustness, stability, and fire resistance. Herein, inspired by plant root-soil structures, mechanically robust Poly-p-phenylene benzoxazole (PBO) nanofiber-reinforced silica aerogels (BNFSi) are designed and synthesized via a dimension-upgrading strategy. The optimized BNFSi are characterized by Compressive strength (3.2 MPa). Additionally, the aerogel demonstrates several outstanding properties, such as low thermal conductivity (27.3 mW m−1 K−1), superior flame retardancy, high mass retention rate (79.7 %), high reflectivity in the visible to near-infrared spectrum (∼ 92 %), and inherent super-hydrophobic surface with a 150.3° water contact angle, indicating self-cleaning potential. The biomimetic-designed structure resolved the inherent brittleness of the silica network while inducing fire-resistant and ideal insulating performance, thus offering a promising avenue for advancing energy-conserving buildings, aligning with the objectives of next-generation eco-conscious construction.

从 0D 纳米二氧化硅球到 3D 网络的尺寸升级,实现用于耐火和低碳应用的坚固气凝胶
全球超过 40% 的能源消耗归因于建筑物的热调节,这凸显了低碳建筑的必要性。具有低导热性的气凝胶隔热材料为节能建筑带来了希望。然而,其机械坚固性、稳定性和耐火性不足阻碍了其广泛应用。本文受植物根-土壤结构的启发,通过尺寸提升策略设计并合成了机械坚固的聚亚苯基苯并恶唑(PBO)纳米纤维增强二氧化硅气凝胶(BNFSi)。优化后的 BNFSi 具有抗压强度(3.2 兆帕)。此外,气凝胶还表现出多种优异性能,如低导热系数(27.3 mW m-1 K-1)、优异的阻燃性、高保质率(79.7%)、可见光至近红外光谱的高反射率(∼ 92%),以及固有的超疏水表面(水接触角为 150.3°),这表明气凝胶具有自清洁潜力。仿生设计的结构解决了二氧化硅网络固有的脆性问题,同时具有防火和理想的隔热性能,从而为推进节能建筑提供了一条大有可为的途径,符合下一代生态意识建筑的目标。
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来源期刊
Materials Science and Engineering: R: Reports
Materials Science and Engineering: R: Reports 工程技术-材料科学:综合
CiteScore
60.50
自引率
0.30%
发文量
19
审稿时长
34 days
期刊介绍: Materials Science & Engineering R: Reports is a journal that covers a wide range of topics in the field of materials science and engineering. It publishes both experimental and theoretical research papers, providing background information and critical assessments on various topics. The journal aims to publish high-quality and novel research papers and reviews. The subject areas covered by the journal include Materials Science (General), Electronic Materials, Optical Materials, and Magnetic Materials. In addition to regular issues, the journal also publishes special issues on key themes in the field of materials science, including Energy Materials, Materials for Health, Materials Discovery, Innovation for High Value Manufacturing, and Sustainable Materials development.
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