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Low-density Three-dimensional Foam Using Self-reinforced Hybrid Two-dimensional Atomic Layers.

机译:使用自增强混合二维原子层的低密度三维泡沫。

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摘要

Low-density nanostructured foams are often limited in applications due to their low mechanical and thermal stabilities. Here we report an approach of building the structural units of three-dimensional (3D) foams using hybrid two-dimensional (2D) atomic layers made of stacked graphene oxide layers reinforced with conformal hexagonal boron nitride (h-BN) platelets. The ultra-low density (1/400 times density of graphite) 3D porous structures are scalably synthesized using solution processing method. A layered 3D foam structure forms due to presence of h-BN and significant improvements in the mechanical properties are observed for the hybrid foam structures, over a range of temperatures, compared with pristine graphene oxide or reduced graphene oxide foams. It is found that domains of h-BN layers on the graphene oxide framework help to reinforce the 2D structural units, providing the observed improvement in mechanical integrity of the 3D foam structure.
机译:低密度纳米结构泡沫由于其低的机械和热稳定性而常常在应用中受到限制。在这里,我们报告了一种使用混合二维(2D)原子层来构建三维(3D)泡沫的结构单元的方法,该混合层由由共形六方氮化硼(h-BN)血小板增强的堆叠氧化石墨烯层制成。使用溶液处理方法可缩放合成超低密度(石墨密度的1/400倍)的3D多孔结构。与原始石墨烯氧化物或还原型石墨烯氧化物相比,由于存在h-BN,形成了分层3D泡沫结构,并且在一定温度范围内观察到混合泡沫结构在机械性能方面的显着改善。发现在石墨烯氧化物框架上的h-BN层的区域有助于增强2D结构单元,从而提供了3D泡沫结构的机械完整性的观察到的改善。

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