Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Ultralight, Recoverable, and High-Temperature-Resistant SiC Nanowire Aerogel
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1021/acsnano.7b08577 Lei Su 1 , Hongjie Wang 1 , Min Niu 1 , Xingyu Fan 1 , Mingbo Ma 1 , Zhongqi Shi 1 , Sheng-Wu Guo 1
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1021/acsnano.7b08577 Lei Su 1 , Hongjie Wang 1 , Min Niu 1 , Xingyu Fan 1 , Mingbo Ma 1 , Zhongqi Shi 1 , Sheng-Wu Guo 1
Affiliation
|
Ultralight ceramic aerogels with the property combination of recoverable compressibility and excellent high-temperature stability are attractive for use in harsh environments. However, conventional ceramic aerogels are usually constructed by oxide ceramic nanoparticles, and their practical applications have always been limited by the brittle nature of ceramics and volume shrinkage at high temperature. Silicon carbide (SiC) nanowire offers the integrated properties of elasticity and flexibility of one-dimensional (1D) nanomaterials and superior high-temperature thermal and chemical stability of SiC ceramics, which makes it a promising building block for compressible ceramic nanowire aerogels (NWAs). Here, we report the fabrication and properties of a highly porous three-dimensional (3D) SiC NWA assembled by a large number of interweaving 3C-SiC nanowires of 20–50 nm diameter and tens to hundreds of micrometers in length. The SiC NWA possesses ultralow density (∼5 mg cm–3), excellent mechanical properties of large recoverable compression strain (>70%) and fatigue resistance, refractory property, oxidation and high-temperature resistance, and thermal insulating property (0.026 W m–1 K–1 at room temperature in N2). When used as absorbents, the SiC NWAs exhibit an adsorption selectivity of low-viscosity organic solvents with high absorption capacity (130–237 g g–1). The successful fabrication of such an attractive material may provide promising perspectives to the design and fabrication of other compressible and multifunctional ceramic NWAs.
中文翻译：
超轻，可恢复且耐高温的SiC纳米线气凝胶
具有可恢复压缩性和出色的高温稳定性的超轻陶瓷气凝胶非常适合在恶劣的环境中使用。然而，常规的陶瓷气凝胶通常由氧化物陶瓷纳米颗粒构成，并且其实际应用一直受到陶瓷的脆性和高温下的体积收缩的限制。碳化硅（SiC）纳米线具有一维（1D）纳米材料的弹性和柔韧性以及SiC陶瓷优异的高温热和化学稳定性的综合特性，这使其成为可压缩陶瓷纳米线气凝胶（NWA）的有前途的构建基块。这里，我们报告了由大量交织的直径为20至50 nm，长度为数十至数百微米的3C-SiC纳米线组装而成的高度多孔的三维（3D）SiC NWA的制造和性能。SiC NWA具有超低密度（〜5 mg cm–3），优异的机械性能和可恢复的大压缩应变（> 70％），耐疲劳性，耐火性能，抗氧化和高温性能以及隔热性能（在N 2中室温下为0.026 W m –1 K –1））。当用作吸收剂时，SiC NWAs表现出具有高吸收能力（130–237 gg –1）的低粘度有机溶剂的吸附选择性。这种有吸引力的材料的成功制造可以为其他可压缩和多功能陶瓷NWA的设计和制造提供有希望的前景。
更新日期：2018-03-07
中文翻译：
超轻，可恢复且耐高温的SiC纳米线气凝胶
具有可恢复压缩性和出色的高温稳定性的超轻陶瓷气凝胶非常适合在恶劣的环境中使用。然而，常规的陶瓷气凝胶通常由氧化物陶瓷纳米颗粒构成，并且其实际应用一直受到陶瓷的脆性和高温下的体积收缩的限制。碳化硅（SiC）纳米线具有一维（1D）纳米材料的弹性和柔韧性以及SiC陶瓷优异的高温热和化学稳定性的综合特性，这使其成为可压缩陶瓷纳米线气凝胶（NWA）的有前途的构建基块。这里，我们报告了由大量交织的直径为20至50 nm，长度为数十至数百微米的3C-SiC纳米线组装而成的高度多孔的三维（3D）SiC NWA的制造和性能。SiC NWA具有超低密度（〜5 mg cm–3），优异的机械性能和可恢复的大压缩应变（> 70％），耐疲劳性，耐火性能，抗氧化和高温性能以及隔热性能（在N 2中室温下为0.026 W m –1 K –1））。当用作吸收剂时，SiC NWAs表现出具有高吸收能力（130–237 gg –1）的低粘度有机溶剂的吸附选择性。这种有吸引力的材料的成功制造可以为其他可压缩和多功能陶瓷NWA的设计和制造提供有希望的前景。
京公网安备 11010802027423号