The Mechanics Institute won the research on super-high specific strength and high thermal conductivity three-dimensional carbon honeycomb structures.

Research Institute of Mechanics has made progress in the study of ultra-high specific strength and high thermal conductivity three-dimensional carbon honeycomb structure

Carbon structures such as fullerenes, carbon nanotubes, graphene, and the like have many excellent properties. Mechanically, researchers have been hoping to make full use of its stable, low-density, ultra-high-strength properties. However, when such frameworks or reinforcing components of macroscopic three-dimensional materials are constructed using such carbon structures, high-strength covalent bonds that maintain such basic unit structures cannot be retained: the structure or the structure-to-matrix bond is usually preserved. Replaced by weaker interactions, such as Van der Waals, so that the intensity of the actual macroscopically three-dimensional material is 2 to 3 orders of magnitude lower than that of its carbon building blocks.

Researchers from the Institute of Mechanics at the Chinese Academy of Sciences, the University of Colorado, and the Massachusetts Institute of Technology have discovered that three-dimensional honeycomb structures constructed from graphene are used when the honeycomb walls are sp2 bonds and sp3 bonds of special structures are formed at the honeycomb walls. The three-dimensional honeycomb structure composed of pure covalent bonds is mechanically stable, and has super high specific strength and high thermal conductivity.

Figure a below shows this typical three-dimensional carbon honeycomb structure; Figure b illustrates the typical stable atomic structure at the honeycomb junction, consisting of two 5-ring and one 8-ring arrays arranged along the periodicity of the interface; Figure c. Compared with the strength of materials reported in the most advanced research, the carbon honeycomb structure has extremely high specific strength along its zigzag direction (green symbol), armchair direction (red), and honeycomb axial direction, indicating that such materials are lightweight and high-strength. Potential in structural applications. At the same time, the structure also has good thermal conductivity. The research results were published in the Nano Express.

The study was supported by the National Natural Science Foundation of China (Wei Yujie, fund number 11425211).

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Standards:ASME B16.9-2007 'ASME B16.25-2007,ASME B16.5-2007,EN10253-1-1999 EN10253-2-2007 EN10253-3-2008 EN10253-4-2008,DIN2605-1-1992 DIN2605-2-1995,JIS B2311-2009 JIS B2312-2009 JIS B2313-2009,GB/T12459-2005 GB/T13401-2005 GB/T10752-2005 ,SH/T3408-1996 SH/T3409-1996
SY/T0609-2006 SY/T0518-2002 SY/T0510-1998 ,DL/T695-1999 GD2000 GD87-1101,HG/T21635-1987 HG/T21631-1990

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