Micro-mechanism and influencing factors of graphene foam elasticity

doi:10.1016/j.carbon.2019.03.084

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	Micro-mechanism and influencing factors of graphene foam elasticity
	Wang C(王超); Zhang C(张存); Chen SH(陈少华)
通讯作者	Chen, Shaohua(chenshaohua72@hotmail.com)
发表期刊	CARBON
	2019-07-01
卷号	148 页码:267-276
ISSN	0008-6223
摘要	The emerging graphene foams (GrFs) have received increasing attention in both scientific and engineering fields in recent years. A good elasticity is the prerequisite for its further applications. However, the mechanism and basic characteristics of elasticity of GrFs have not been understood clearly so far. In this paper, we conduct systematic simulations of compression-uncompression and tension-untension to study the characteristics of GrF elasticity using the coarse-grained molecular dynamics (CGMD) method. We find that deformation of GrFs is highly nonuniform at the scale of both flakes and regions, which is qualitatively consistent with the experimental observations. The deformation of GrFs is dominated by the flake bending rather than stretching, which is independent of the loading type, size, shape or thickness of flakes, as well as the density or stiffness of crosslinks. The great asymmetry of elasticity under tension and compression is induced by different mode of bond breaking. Furthermore, by evaluating the elastic energy density, we find that both thicker flakes and more crosslinks are two key factors responsible for good elasticity of GrFs. These results should be useful for understanding GrF elasticity and further design of advanced graphene-based materials. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	Graphene foam Super-elasticity Nonuniformity Deformation mechanism Coarse-grained molecular dynamics
DOI	10.1016/j.carbon.2019.03.084
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000468421900029
关键词[WOS]	SPONGY GRAPHENE ; MECHANISM ; BEHAVIOR ; AEROGELS
WOS研究方向	Chemistry ; Materials Science
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary
资助项目	NSFC[11502150] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503] ; Natural Science Foundation of Hebei Province of China[A2016210060] ; Higher Education Youth Talents Program of Hebei Province of China[BJ2017052]
项目资助者	NSFC ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Natural Science Foundation of Hebei Province of China ; Higher Education Youth Talents Program of Hebei Province of China
论文分区	一类
力学所作者排名	1
RpAuthor	Chen, Shaohua
引用统计	被引频次：21[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/80702
专题	非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Wang C,Zhang C,Chen SH. Micro-mechanism and influencing factors of graphene foam elasticity[J]. CARBON,2019,148:267-276.
APA	王超,张存,&陈少华.(2019).Micro-mechanism and influencing factors of graphene foam elasticity.CARBON,148,267-276.
MLA	王超,et al."Micro-mechanism and influencing factors of graphene foam elasticity".CARBON 148(2019):267-276.

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