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Graphene Foam: Hole-Flake Network for Uniaxial Supercompression and Recovery Behavior
Pan DX(潘斗兴)1,2; Wang C(王超)2; Wang XJ1
Corresponding AuthorPan, Douxing( ; Wang, Xiaojie(
Source PublicationACS NANO
AbstractWe employed the coarse-grained molecular dynamics simulation method to systematically study the uniaxial supercompression and recovery behavior of multi porous graphene foam, in which a mesoscopic three-dimensional network with hole-graphene flakes was proposed. The network model not only considers the physical cross-links and interlayer van der Waals interactions, but also introduces a hole in the flake to approach the imperfection of pristine graphene and the hierarchical porous configuration of real foam material. We first recreated a typical two-stage supercompression stress strain relationship and the corresponding time-dependent recovery as well as a U-type nominal Poisson ratio. Then the recovery unloading at different strains and multicycle compression-uncompression were both conducted; the initial elastic moduli in the multicycles were found to be the same, and a multilevel residual strain was disclosed. Importantly, the residual strain is not exactly the plastic one, part of which can resurrect in the subsequent loading-unloading-holding. The mesoscopic mechanism of viscoelastic and residual deformation for the recovery can be attributed to the van der Waals repulsion and mechanical interlocking among the hole-flakes; interestingly, the local tensile stress was observed in the virial stress distribution. Particularly, an abnormal turning point in the length-time curve for the mean bead-bond length was captured during the supercompression. After the point, the length abnormally increases for different size ratios of the hole to the flake, which is in line with the mesostructure evolution. The finding may provide a mesoscopic criterion for the supercompression of graphene foam related materials.
Keywordcoarse-grained molecular dynamics graphene foam supercompression recovery behavior strain history mesoscale van der Waals interaction viscoelastoplasticity
Indexed BySCI ; EI
WOS IDWOS:000451789200088
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
Funding ProjectNational Natural Science Foundation for the Youth (NSFY) of China[11802306] ; National Natural Science Foundation for the General Program (NSFG) of China[11572320] ; Chongqing City Basic and Frontier Research Project[cstc2015jcyjBX0135]
Funding OrganizationNational Natural Science Foundation for the Youth (NSFY) of China ; National Natural Science Foundation for the General Program (NSFG) of China ; Chongqing City Basic and Frontier Research Project
ContributorPan, Douxing ; Wang, Xiaojie
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Adv Mfg Technol, Bioinspired Robot & Intelligent Mat Lab, Changzhou 213164, Peoples R China;
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Pan DX,Wang C,Wang XJ. Graphene Foam: Hole-Flake Network for Uniaxial Supercompression and Recovery Behavior[J]. ACS NANO,2018,12(11):11491-11502.
APA 潘斗兴,王超,&Wang XJ.(2018).Graphene Foam: Hole-Flake Network for Uniaxial Supercompression and Recovery Behavior.ACS NANO,12(11),11491-11502.
MLA 潘斗兴,et al."Graphene Foam: Hole-Flake Network for Uniaxial Supercompression and Recovery Behavior".ACS NANO 12.11(2018):11491-11502.
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