Mechanical abnormality in graphene-based lamellar superstructures

Morris, Benjamin; Becton, Matthew; Wang, Xianqiao

doi:10.1016/j.carbon.2018.05.022

Cited by 14 publications

(14 citation statements)

References 48 publications

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“…The number of atoms in the system is 1836. This structure is very close to that discussed in [38,50]. The geometry of the considered structure consists of graphene bridges and lamellae.…”

Section: Simulation Detailssupporting

confidence: 82%

“…The change in morphology gives rise to improved mechanical behavior and an increased surface area. Moreover, the majority of works are devoted to the study of compressive behavior in simulation as well as in experiments [37][38][39]. The reason for this is that compressible materials efficiently translate mechanical deformations into electrical signals that have various potential applications.…”

Section: Introductionmentioning

confidence: 99%

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Strength and Deformation Behavior of Graphene Aerogel of Different Morphologies

Baimova,

Shcherbinin

2023

Materials

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Graphene aerogels are of high interest nowadays since they have ultralow density, rich porosity, high deformability, and good adsorption. In the present work, three different morphologies of graphene aerogels with a honeycomb-like structure are considered. The strength and deformation behavior of these graphene honeycomb structures are studied by molecular dynamics simulation. The effect of structural morphology on the stability of graphene aerogel is discussed. It is shown that structural changes significantly depend on the structural morphology and the loading direction. The deformation of the re-entrant honeycomb is similar to the deformation of a conventional honeycomb due to the opening of the honeycomb cells. At the first deformation stage, no stress increase is observed due to the structural transformation. Further, stress concentration on the junctions of the honeycomb structure and over the walls occurs. The addition of carbon nanotubes and graphene flakes into the cells of graphene aerogel does not result in a strength increase. The mechanisms of weakening are analyzed in detail. The obtained results further contribute to the understanding of the microscopic deformation mechanisms of graphene aerogels and their design for various applications.

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“…The number of atoms in the system is 1836. This structure is very close to that discussed in [38,50]. The geometry of the considered structure consists of graphene bridges and lamellae.…”

Section: Simulation Detailssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Strength and Deformation Behavior of Graphene Aerogel of Different Morphologies

Baimova,

Shcherbinin

2023

Materials

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“…While scaling 2D graphene up to its three-dimensional counterparts there are many significant challenges in maintaining the nature and intrinsic properties of individual graphene sheets in the resulting three-dimensional bulk structures. But the comprehensive theoretical studies of CHs [9,[16][17][18][19][20][21][22][23] proved their superb strength and stability. This strength remains at a high level but tunable with different cell sizes [17,24] and crucially depends on defectness of CH structures [25].…”

Section: Theory Of Chs and Important Applicationsmentioning

confidence: 99%

Absorption of atomic and molecular species in carbon cellular structures (Review article)

Krainyukova

Kuchta

Firlej

et al. 2020

Low Temperature Physics

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The paper presents a brief review of the recent developments in the field of absorption of atomic and molecular species in carbon cellular structures. Such absorbing objects can be distinctly recognized among a large family of carbon porous materials owing to potential and already observed in experiments very high capacity to soak and to keep inside different substances, which at usual conditions outside the porous matrices may often stay only in a gaseous form. High capacity filling is attained owing to single graphene-like walls separating different cells in the whole structures providing their lightweight. This property of cellular structures makes them very promising for numerous technological applications such as hydrogen storage in fuel cells and molecular sieving in membranes made from such structures or for their usage in microelectronics, photovoltaics and production of Li-ion batteries. Independently of the targeted applications gases are good candidates for probing tests of carbon matrices themselves.

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“…Similar to polymeric open-cell foams, they proposed individual power indexes for normalized values of the mentioned properties as a function of normalized density. In another work, MD simulations were utilized to find the mechanical response of graphene based lamellar foams in tension and compression [23]. The simulations showed ultra-high strength in both loading conditions and in each direction.…”

Section: Introductionmentioning

confidence: 99%

Compressive modulus and deformation mechanisms of 3DG foams: experimental investigation and multiscale modeling

Mahdavi¹,

Adibnazari²,

Monte³

et al. 2021

Nanotechnology

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Due to the wide applications of three-dimensional graphene (3DG) foam in bio-sensors, stretchable electronics, and conductive polymer composites, predicting its mechanical behavior is of paramount importance. In this paper, a novel multiscale finite element model is proposed to predict the compressive modulus of 3DG foams with various densities. It considers the effects of pore size and structure and the thickness of graphene walls on 3DG foams’ overall behavior. According to the scanning electron microscope images, a unit cell is selected in the microscale step to represent the incidental arrangement of graphene sheets in 3DG foams. After derivation of equivalent elastic constants of the unit cell by six individual load cases, the whole unit cell is considered an equivalent element. The macroscale model is prepared by defining a representative volume element (RVE), containing a sufficient number of the equivalent elements. Assigning a stochastic local coordinate system for each equivalent element in the macro RVE provides a model that could be utilized for elastic modulus estimation of 3DG foams in macroscale. To investigate the correspondence between the theoretical results and experimental data, 3DG foams were synthesized with four densities, and their compressive behavior were evaluated. The mass densities of the prepared foams were 5.36, 8.50, 9.37, and 11.5 mg cm−3, and the corresponding measured elastic modulus for each were 6.4, 10.7, 16.9, and 29.1 kPa, respectively. The predicted modulus by the proposed model for the synthesized foams were 6.1, 13.1, 15.6 and 21.7 kPa, respectively. The results show that the maximum divergence between estimated values and experimental data is less than 25%, confirming the high capability of the model in the estimation of 3DG foams’ properties.

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Mechanical abnormality in graphene-based lamellar superstructures

Cited by 14 publications

References 48 publications

Strength and Deformation Behavior of Graphene Aerogel of Different Morphologies

Strength and Deformation Behavior of Graphene Aerogel of Different Morphologies

Absorption of atomic and molecular species in carbon cellular structures (Review article)

Compressive modulus and deformation mechanisms of 3DG foams: experimental investigation and multiscale modeling

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