Micro-mechanism and influencing factors of graphene foam elasticity

doi:10.1016/j.carbon.2019.03.084

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Micro-mechanism and influencing factors of graphene foam elasticity
	Wang C(王超); Zhang C(张存); Chen SH(陈少华)
刊名	CARBON
	2019-07-01
卷号	148 页码:267-276
关键词	Graphene foam Super-elasticity Nonuniformity Deformation mechanism Coarse-grained molecular dynamics
ISSN号	0008-6223
DOI	10.1016/j.carbon.2019.03.084
通讯作者	Chen, Shaohua(chenshaohua72@hotmail.com)
英文摘要	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.
分类号	一类
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]
WOS关键词	SPONGY GRAPHENE ; MECHANISM ; BEHAVIOR ; AEROGELS
WOS研究方向	Chemistry ; Materials Science
语种	英语
WOS记录号	WOS:000468421900029
资助机构	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
其他责任者	Chen, Shaohua
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/80702]
专题	力学研究所_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.