A coarse-grained model for the mechanical behavior of multi-layer graphene

Ruiz, Luis; Xia, Wenjie; Meng, Zhaoxu; Keten, Sinan

doi:10.1016/j.carbon.2014.10.040

Cited by 167 publications

(160 citation statements)

References 72 publications

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“…Similar shear stresses have been experimentally obtained for multi-walled carbon nanotubes (MWCNTs) and graphite, demonstrating the ultralow interlayer shear interactions dominated by vdW forces [54]. Some modeling works and bending experiments have reported considerably high shear stress between graphene layers (∼0.1 GPa) due to the commensurability-dependent stick-slip friction with periodically changing peak shear stress [55,56]. Instead, the relatively lower values here can be attributed to the averaged effect caused by the limited spatial resolution of the Raman laser spot (∼1 μm).…”

Section: Prl 119 036101 (2017) P H Y S I C a L R E V I E W L E T T Esupporting

confidence: 68%

Measuring Interlayer Shear Stress in Bilayer Graphene

et al. 2017

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Monolayer two-dimensional (2D) crystals exhibit a host of intriguing properties, but the most exciting applications may come from stacking them into multilayer structures. Interlayer and interfacial shear interactions could play a crucial role in the performance and reliability of these applications, but little is known about the key parameters controlling shear deformation across the layers and interfaces between 2D materials. Herein, we report the first measurement of the interlayer shear stress of bilayer graphene based on pressurized microscale bubble loading devices. We demonstrate continuous growth of an interlayer shear zone outside the bubble edge and extract an interlayer shear stress of 40 kPa based on a membrane analysis for bilayer graphene bubbles. Meanwhile, a much higher interfacial shear stress of 1.64 MPa was determined for monolayer graphene on a silicon oxide substrate. Our results not only provide insights into the interfacial shear responses of the thinnest structures possible, but also establish an experimental method for characterizing the fundamental interlayer shear properties of the emerging 2D materials for potential applications in multilayer systems.

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Section: Prl 119 036101 (2017) P H Y S I C a L R E V I E W L E T T Esupporting

confidence: 68%

Measuring Interlayer Shear Stress in Bilayer Graphene

et al. 2017

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“…These efforts will allow for an enhanced materials-by-design approach for CNC hierarchical materials that will help to improve upon the current shortcomings in the performance of these materials. Beyond CNCs, these results could be extended to describe interface within other highly ordered, aligned material systems such as actin networks (Kang et al, 2011) in muscle or multi-layered graphene sheets (Ruiz et al, 2015).…”

Section: Prediction Of Cnc Neat Film Properties Using Simulation and mentioning

confidence: 99%

Traction–separation laws and stick–slip shear phenomenon of interfaces between cellulose nanocrystals

Sinko

Keten

2015

Journal of the Mechanics and Physics of Solids

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Cellulose nanocrystals (CNCs) are one of nature's most abundant structural material building blocks and possess outstanding mechanical properties such as a tensile modulus comparable to Kevlar. It remains challenging to upscale these properties in CNC neat films and nanocomposites due to the difficulty of characterizing interfacial bonding between CNCs that govern stress transfer under deformation. Here we present new analyses based on atomistic simulations of shear and tensile failure of the interfaces between Iβ CNCs in elementary fibrils, providing new insight into factors governing the mechanical behavior of hierarchical nanocellulose materials. We compare the two most relevant crystal surfaces and find that hydrogen bonded surfaces have greater tensile strength compared to the surfaces governed by weaker interactions. On the contrary, shearing simulations show that friction between the atomic interfaces depends not only on surface energy but also the energy landscape along the shear direction. While being a weaker interface, the intersheet plane exhibits greater energy barriers to shear. The molecular roughness of this interface, characterized by a greater energy barrier, exhibits a stick-slip deformation behavior as opposed to a continuous sliding mechanism observed for the interfaces with hydrogen bonds. Analytical models to describe the energy landscapes are developed using energy scaling relations for van der Waals surfaces in combination with a modification of the Prandtl-Tomlinson model for atomic friction. Our simulations pave the way for tailoring hierarchical CNC materials by taking a similar approach to techniques employed for describing metals, where mechanical properties can be tuned through a deeper understanding of grain boundary physics and nanoscale interfaces. 3 Graphical Abstract: 4

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“…Meanwhile, owing to its weak interlayer van der Waals (vdW) and strong intralayer covalent bonds interactions, multilayered graphene could be ideal solid lubricants [7,8]. The friction between sliding graphene layers is inevitable as it is a result of interlayer interactions [9][10][11]. Although the interlayer friction properties of graphene has been the subject of many experimental [12][13][14] and theoretical studies [15][16][17][18], the underlying mechanism is far from well understood.…”

Section: Introductionmentioning

confidence: 99%