Torsional Buckling of Multi-walled Carbon Nanotubes Subjected to Torsional Loads

Wang, X. Y.

doi:10.1177/0731684406072538

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…Due to their unique properties, a significant amount of research has been devoted to their synthesis, characterization, and applications [7][8][9][10]. In particular, the mechanical properties of CNTs, and their modification, have been the subject of numerous research studies [11][12][13][14][15]. For instance, Brieland-Shoultz et al [2] showed that the effective Young's modulus of CNT micropillars increased from 14.5 MPa for uncoated CNTs to 24.5 GPa with 51 nm Al 2 O 3 coating.…”

Section: Introductionmentioning

confidence: 99%

Tuning the mechanical properties of vertical graphene sheets through atomic layer deposition

et al. 2016

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We report the fabrication and characterization of graphene nanostructures with mechanical properties that are tuned by conformal deposition of alumina. Vertical graphene (VG) sheets, also called carbon nanowalls (CNWs), were grown on copper foil substrates using a radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) technique and conformally coated with different thicknesses of alumina (Al2O3) using atomic layer deposition (ALD). Nanoindentation was used to characterize the mechanical properties of pristine and alumina-coated VG sheets. Results show a significant increase in the effective Young's modulus of the VG sheets with increasing thickness of deposited alumina. Deposition of only a 5 nm thick alumina layer on the VG sheets nearly triples the effective Young's modulus of the VG structures. Both energy absorption and strain recovery were lower in VG sheets coated with alumina than in pure VG sheets (for the same peak force). This may be attributed to the increase in bending stiffness of the VG sheets and the creation of connections between the sheets after ALD deposition. These results demonstrate that the mechanical properties of VG sheets can be tuned over a wide range through conformal atomic layer deposition, facilitating the use of VG sheets in applications where specific mechanical properties are needed.

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Section: Introductionmentioning

confidence: 99%

Tuning the mechanical properties of vertical graphene sheets through atomic layer deposition

et al. 2016

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“…Earlier modelling efforts on MWCNTs via shell models towards torsional buckling with van der Waals interactions indicated interlayer slipping governed critical shear for thinwalled, large radii nanotubes, where the number of layers does not significantly impact behaviour. 130 This finding implies a potential limitation as well as a convenience for most composite applications today and in the near future, since polydisperse MWCNTs are currently the most readily available and affordable for scale-up targeting feasible materials and technology development in the short-term. Saha and Maiti generally support this outcome for MWCNTs from 2-6 layers thick, with extensive results on triple-walled CNTs.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

“…Torsional buckling via shell model and MD simulations support a van der Waals interaction between layers in shear for double-walled CNTs128 and MWCNTs129 that strengthens the nanomaterial. Earlier modelling efforts on MWCNTs via shell models towards torsional buckling with van der Waals interactions indicated interlayer slipping governed critical shear for thin-walled, large radii nanotubes, where the number of layers does not significantly impact behaviour 130. This finding implies a potential limitation as well as a convenience for most composite applications today and in the near future, since polydisperse MWCNTs are currently the most readily available and affordable for scale-up targeting feasible materials and technology development in the short-term.…”

Section: One-dimensional Nanowires Nanotubes and Other Nanostructuresmentioning

confidence: 99%

Mechanical properties of selected nanostructured materials and complex bio-nano, hybrid and hierarchical systems

Aston

Bow

Gangadean

2013

International Materials Reviews

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Fundamental investigations into mechanical behaviour and properties, e.g. elasticity, plasticity, hardness, toughness, strength and failure, exhibited at the nanoscale have increased rapidly in number and in breadth over the past two decades as experimental techniques and theoretical treatments have advanced. This review covers selected contemporary nanomechanics research and gives an overview of some fundamental questions, measurement challenges and opportunities concerning nanostructured materials, their mechanical properties and deformation mechanisms -particularly, relationships with size-scale phenomena. Significant theoretical developments are mentioned in relevant sections and advances in computational modelling are considered briefly, including perspectives on the current state and gaps between complete and rigorous simulations for mechanical behaviour in nanomaterials and experimental data to qualify certain predictive calculations. We categorise the study of mechanics by nanomaterial types from primary objects (i.e. single nanoscale elements like nanofibres and nanopillars), simple composites and other extended nanostructures like films and multilayers to complex natural and synthetic systems ranging from biological cells and mineralised biocomposites to nanoelectromechanical systems and DNA nanorobots. The future outlook and concluding remarks summarise general areas of open knowledge in the field and include a call for increased collaboration between experiments and modelling for the fruition of twenty-first century advancements and exploration.

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“…In the analysis of single-walled carbon nanotubes (SWCNs), there are in the literature three-dimensional finite element models 4–6 for armchair, zigzag and chiral SWCNs, wherein the bonds between carbon atoms are considered as connecting load-carrying members, while the carbon atoms as joints of the members. To create the finite element (FE) models, nodes are placed at the locations of carbon atoms and the bonds between them are modeled using the three-dimensional elastic beam elements.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response of single-walled carbon nanotubes based on various shell theories

Palacios

Ganesan

2019

Journal of Reinforced Plastics and Composites

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Carbon nanotubes are used in several engineering applications because of their superior mechanical properties. Scientific works still need to be carried out, especially on their dynamic response. These studies mainly focus on modal analysis, considering zigzag and armchair nanotubes, and sometimes, varying chirality. However, these works do not present any results on the steady-state responses. Therefore, the objective of this paper is to perform different studies, in terms of the stiffness response, modal analysis and steady-state response of single-walled carbon nanotubes by using a 3D finite-element model of the single-walled carbon nanotube, under different types of boundary conditions, to provide more results in this field. The single-walled carbon nanotube is modeled as a space frame structure by using the Morse potential and as a thin shell model based on various shell theories. A static analysis is performed to compare the stress–strain behavior between the Morse potential and the thin shell model. A parametric study on chirality effects and aspect ratio is also conducted to determine which shell theory is more suitable to model the mechanical behavior of single-walled carbon nanotubes. Finally, the analysis of harmonic response is conducted to describe the steady-state response between both the models.

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Torsional Buckling of Multi-walled Carbon Nanotubes Subjected to Torsional Loads

Cited by 11 publications

References 34 publications

Tuning the mechanical properties of vertical graphene sheets through atomic layer deposition

Tuning the mechanical properties of vertical graphene sheets through atomic layer deposition

Mechanical properties of selected nanostructured materials and complex bio-nano, hybrid and hierarchical systems

Dynamic response of single-walled carbon nanotubes based on various shell theories

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