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Resilient Si3N4 Nanobelt Aerogel as Fire-Resistant and Electromagnetic Wave-Transparent Thermal Insulator
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-04-09 00:00:00 , DOI: 10.1021/acsami.9b02869
Lei Su 1 , Mingzhu Li 1 , Hongjie Wang 1 , Min Niu 1 , De Lu 1 , Zhixin Cai 1
Affiliation  

With the prevailing energy challenges and the rapid development of aerospace engineering, high-performance thermal insulators with various functions are attracting more and more attention. Ceramic aerogels are promising candidates for thermal insulators to be applied in harsh environments because of their low thermal conductivity and simultaneously excellent thermal and chemical stabilities. In general, the effective properties of this class of materials depend on both their microstructures and the intrinsic properties of their building blocks. Herein, to enrich the family and broaden the application fields of this class of materials, we prepared ultralight α-Si3N4 nanobelt aerogels (NBAs) with tunable densities ranging from 1.8 to 9.6 mg cm–3. The α-Si3N4 NBA realized resilient compressibility (with a recoverable strain of 40–80%), fire resistance (1200 °C butane blow torch), thermal insulation (0.029 W m–1 K–1), and electronic wave transparency (a dielectric constant of 1–1.04 and a dielectric loss of 0.001–0.004) in one material, which makes it a promising candidate for mechanical energy dissipative, fire-resistant, and electronic wave-transparent thermal insulator to be applied in extreme conditions. The successful preparation of such resilient and multifunctional α-Si3N4 NBAs will open up a new world for the development and widespread applications of ceramic aerogels.

中文翻译:

具弹性的Si 3 N 4纳米带气凝胶,可作为耐火和电磁波透明的绝热材料

随着能源挑战和航空航天工程的飞速发展,具有多种功能的高性能绝热材料正受到越来越多的关注。陶瓷气凝胶因其低导热率以及出色的热稳定性和化学稳定性而成为在恶劣环境中使用的绝热材料的有希望的候选者。通常,这类材料的有效特性取决于它们的微观结构和其构件的固有特性。在此,以丰富的家庭和扩大这一类的材料的应用领域,我们准备了超轻α-的Si 3 Ñ 4纳米带气凝胶(NBA的)具有可调的密度范围为1.8至9.6毫克厘米-3。α-Si3 N 4 NBA实现了弹性可压缩性(可恢复应变为40–80%),耐火性(1200°C丁烷吹管),隔热(0.029 W m –1 K –1)和电子波透明性(电介质在一种材料中,其常数为1–1.04,介电损耗为0.001–0.004),这使其成为在极端条件下应用机械耗能,耐火和电子波透明的绝热材料的有希望的候选者。这种弹性和多官能α-Si的成功制备3 Ñ 4 NBA的将开辟一个新的世界的发展和陶瓷气凝胶的广泛的应用。
更新日期:2019-04-09
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