Compressive deformation mechanism of honeycomb-like graphene aerogels

Shang, Jing; Yang, Qing-Sheng; Liu, Xia; Wang, Chao

doi:10.1016/j.carbon.2018.04.013

Cited by 19 publications

(15 citation statements)

References 46 publications

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“…Upon closer inspection in Figure f,g, it is revealed the nearly paralleled graphene sheets tends to bend to release the externally applied force (wall‐to‐wall contraction or densification) while the bridge term performs out‐of‐plane “buckling” behavior, though both could fully return to their original states (Figure h,i), which agrees well with other reports elsewhere . However, rather than local stress concentration, the rotation was observed at the joint part in Figure j during the compression process, which is different from those reported by Shang et al This behavior is possible because the wall near the joint exhibits gradient thickness distribution as shown in Figure i. Above simulation and in situ micro exploration further demonstrated the superior flexibility of the GA is mainly derived from the rationally hierarchical architecture.…”

Section: Resultssupporting

confidence: 83%

“…The simplified facial-linking pattern unit cell composed of three parts: (1) lamella, (2) bridge, and (3) joint as building blocks to construct the GA as shown in Figure 3d,e. [11] However, rather than local stress concentration, the rotation was observed at the joint part in Figure 3j during the compression process, which is different from those reported by Shang et al [43] This behavior is possible because the wall near the joint exhibits gradient thickness distribution as shown in Figure 2i. [11] However, rather than local stress concentration, the rotation was observed at the joint part in Figure 3j during the compression process, which is different from those reported by Shang et al [43] This behavior is possible because the wall near the joint exhibits gradient thickness distribution as shown in Figure 2i.…”

Section: Mechanical Characterization and Finite Element Analysismentioning

confidence: 58%

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Biomimetic and Radially Symmetric Graphene Aerogel for Flexible Electronics

Gao

Fan

Zhou

et al. 2019

Adv Elect Materials

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Developing a generalized route to effectively fabricate periodic mechanically flexible graphene aerogels across several size orders and whole structural integrity on a large scale for flexible electronics is still a challenge. Herein, inspired by bamboo's natural hierarchical structure, a general method is developed to effectively fabricate biomimetic cellular graphene fibers using hydrogen bubbles and ice simultaneously as templates, whose whole size ranges from micro to several centimeters. Owing to its superior mechanical flexibility demonstrated by the in situ scanning electron microscope test and intrinsically good electrical conductivity, its potential in flexible electronics such as sensors, supercapacitors, and Ni–Zn batteries is carefully investigated. It not only shows superior sensitivity in the monitoring of the pulse pressure in sensor devices but also directly serves as a promising binder, flexible scaffold, and conductive additive, as well as extra active material in the energy storage device without any extra additives. This strategy can also be extended to fabricate other configurations of graphene aerogels such as spring‐like type and bulk film, able to serve as the next generation of intelligent infrastructure for achieving multifunctional structural and functional tasks.

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Section: Resultssupporting

confidence: 83%

Section: Mechanical Characterization and Finite Element Analysismentioning

confidence: 58%

Biomimetic and Radially Symmetric Graphene Aerogel for Flexible Electronics

Gao

Fan

Zhou

et al. 2019

Adv Elect Materials

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“…However, it is possible to bring [17], natural cork [46], and rigid closed-cell polyurethane foam [47]. As discussed above, the ability to accurately model non-monotonic volumetric shrinkage and expansion will be important for the simulation and design of next-generation lattice materials, including ultraporous sponges [26] graphene foams aerogels (e.g [27,28,29,30]) in which elastic recovery from compressive strains of 90% have been reported [31]. Graphene aerogels can also be 3D printed [64] allowing for the creation of highly elastic, deformable, and complex lattices structures.…”

Section: Discussionmentioning

confidence: 99%

“…Recent advances in material science include the development of ceramic nanolattices [24], mycelium-based bio-foams [25], ultraporous sponges [26] graphene foams and aerogels (e.g [27,28,29,30]) some capable of recovering from 90% compression [31]. Furthermore, accurate volumetric formulations are relevant to stroke biomechanics research since blood clot contractions cause large volume changes (e.g.…”

Section: Introductionmentioning

confidence: 99%

Novel hyperelastic models for large volumetric deformations

Moerman

Fereidoonnezhad

McGarry

2020

International Journal of Solids and Structures

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Materials such as elastomeric foams, lattices, and cellular solids are capable of undergoing large elastic volume changes. Although many hyperelastic constitutive formulations have been proposed for deviatoric (shape changing) behaviour, few variations exist for large deformation volumetric behaviour. The first section of this paper presents a critical analysis of current volumetric hyperelastic models and highlights their limitations for large volumetric strains. In the second section of the paper we propose three novel volumetric strain energy density functions, which: 1) are valid for large volumetric deformations, 2) offer separate control of the volumetric strain stiffening behaviour during shrinkage (volume reduction) and expansion (volume increase), and 3) provide precise control of non-monotonic volumetric strain stiffening. To illustrate the ability of the novel formulations to capture complex volumetric material behaviour they are fitted and compared to a range of published experimental data.

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“…However, to our best knowledge, all numerical models of GrFs published in references, no matter the full-atomic models [16,[35][36][37][38], coarse-grained models [28,[39][40][41][42] or finite element one [43], have a fairly idealized assumption that the thickness of constituent graphene sheets is the same throughout GrF systems. For example, all samples using fullatomic models [16,[35][36][37][38] are composed of thinnest 1-layer graphene sheets, while other coarse-grained models [28,[39][40][41][42] or finite element one [43] are composed of sheets with 1-layer or multi-layer single thickness.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Deformation Mechanisms of Graphene Foams with Bi-Modal Sheet Thickness by Coarse-Grained Molecular Dynamics Simulations

2021

Self Cite

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Graphene foams (GrFs) have been widely used as structural and/or functional materials in many practical applications. They are always assembled by thin and thick graphene sheets with multiple thicknesses; however, the effect of this basic structural feature has been poorly understood by existing theoretical models. Here, we propose a coarse-grained bi-modal GrF model composed of a mixture of 1-layer flexible and 8-layer stiff sheets to study the mechanical properties and deformation mechanisms based on the mesoscopic model of graphene sheets (Model. Simul. Mater. Sci. Eng. 2011, 19, 54003). It is found that the modulus increases almost linearly with an increased proportion of 8-layer sheets, which is well explained by the mixture rule; the strength decreases first and reaches the minimum value at a critical proportion of stiff sheets ~30%, which is well explained by the analysis of structural connectivity and deformation energy of bi-modal GrFs. Furthermore, high-stress regions are mainly dispersed in thick sheets, while large-strain areas mainly locate in thin ones. Both of them have a highly uneven distribution in GrFs due to the intrinsic heterogeneity in both structures and the mechanical properties of sheets. Moreover, the elastic recovery ability of GrFs can be enhanced by adding more thick sheets. These results should be helpful for us to understand and further guide the design of advanced GrF-based materials.

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Compressive deformation mechanism of honeycomb-like graphene aerogels

Cited by 19 publications

References 46 publications

Biomimetic and Radially Symmetric Graphene Aerogel for Flexible Electronics

Biomimetic and Radially Symmetric Graphene Aerogel for Flexible Electronics

Novel hyperelastic models for large volumetric deformations

Mechanical Properties and Deformation Mechanisms of Graphene Foams with Bi-Modal Sheet Thickness by Coarse-Grained Molecular Dynamics Simulations

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