Temperature and size-dependent modeling for predicting mechanical properties of carbon nanotubes

Bian, Lichun; Li, Hao; Cheng, Yong

doi:10.1016/j.apm.2021.05.022

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…However, the predicted results of SWCNT EPR from different research teams seem inconsistent, even though they were all based on MM, and without considering chirality. For example, Zhu and Wang [4] estimated that the EPRs of the zigzag and armchair SWCNTs with a big enough diameter would both reach about 0.27, which is approaching to the reported results [3,[5][6][7][8]. Meanwhile, the EPRs of the SWCNTs (with diameter > 2 nm) calculated by Xiao et al [9] were close to 0.21, which is very close to Materials 2022, 15, 8720 2 of 15 a lattice-dynamics result [10].…”

Section: Introductionsupporting

confidence: 52%

“…Molecular mechanics (MM) paved an effective way to study EPR of SWCNTs. In the MM model, the C-C bond in CNTs is always treated as a beam of nonlinear spring structure [3]. However, the predicted results of SWCNT EPR from different research teams seem inconsistent, even though they were all based on MM, and without considering chirality.…”

Section: Introductionmentioning

confidence: 99%

“…In mechanics, there is a controversy on how to model SWCNT following continuum theory. For instance, Bian et al [3] treated CNTs as an isotropic material in their MM model, as they thought effective wall thickness (h) of CNTs was too small and thus neglected the radial stress. This assumption was similar to that in the study of Zhu and Wang [4].…”

Section: Introductionmentioning

confidence: 99%

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Chirality-Dependent and Intrinsic Auxeticity for Single-Walled Carbon Nanotubes

2022

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Single-walled carbon nanotubes (SWCNTs) have superior mechanical properties which originate from a strong C-C covalent bond and unique nanostructure. Chirality, one of the helical structural parameters of SWCNTs, leads to differences in mechanical performance. In this work, molecular dynamics (MD) simulation was performed to analyze engineering Poisson’s ratio (EPR) and incremental Poisson’s ratio (IPR) of SWCNTs with different chiral angles, respectively, under tensile and compressive load, as well as the chiral effect on rigidity. We reported the minimum EPR for (4, 1) SWCNT and obtained the distribution and trend of EPR which is dependent on chiral index m. In addition, a new observation showed two exactly opposite trends of EPR existing not only in tension and compression but also in the longitudinal and radial directions. Furthermore, we found that the critical strain, over which SWCNT would be auxetic, ranged from 6% to 18% and was also chirality-dependent. Three representative SWCNTs with chiral angle of 0° (zigzag), 10.89° (chiral), and 30° (armchair) were selected for the mechanism study of auxeticity. Finally, a method of the contribution to radial strain for two main deformation modes proposed in this paper could well explain the negative IPR phenomenon.

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Section: Introductionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chirality-Dependent and Intrinsic Auxeticity for Single-Walled Carbon Nanotubes

2022

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“…On top of that, multi-walled carbon nanotubes have cleaner surfaces. Nanotube radii are inversely proportional to shear and Young's moduli [51]. Defect centers, which resemble rings with seven or five members, commonly develop at the extremities of the tubes, on the surfaces of the layers, and between the layers of single-walled carbon nanotubes as they expand.…”

Section: Carbon Nanotube Structurementioning

confidence: 99%

Recent Advances in Carbon Nanotube Utilization in Perovskite Solar Cells: A Review

Asghar,

Qamar,

Hakami

et al. 2024

Micromachines

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Due to their exceptional optoelectronic properties, halide perovskites have emerged as prominent materials for the light-absorbing layer in various optoelectronic devices. However, to increase device performance for wider adoption, it is essential to find innovative solutions. One promising solution is incorporating carbon nanotubes (CNTs), which have shown remarkable versatility and efficacy. In these devices, CNTs serve multiple functions, including providing conducting substrates and electrodes and improving charge extraction and transport. The next iteration of photovoltaic devices, metal halide perovskite solar cells (PSCs), holds immense promise. Despite significant progress, achieving optimal efficiency, stability, and affordability simultaneously remains a challenge, and overcoming these obstacles requires the development of novel materials known as CNTs, which, owing to their remarkable electrical, optical, and mechanical properties, have garnered considerable attention as potential materials for highly efficient PSCs. Incorporating CNTs into perovskite solar cells offers versatility, enabling improvements in device performance and longevity while catering to diverse applications. This article provides an in-depth exploration of recent advancements in carbon nanotube technology and its integration into perovskite solar cells, serving as transparent conductive electrodes, charge transporters, interlayers, hole-transporting materials, and back electrodes. Additionally, we highlighted key challenges and offered insights for future enhancements in perovskite solar cells leveraging CNTs.

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“…Carbon nanotubes (CNTs) have drawn the extensive interest researchers since their discovery because of their superior electrical, thermal, mechanical , and physical attribute [1][2][3][4][5]. Due to these excellent properties, CNTs are widely used in the development of nano-electro-mechanical systems (NEMS) [6][7][8][9]; The structural properties of CNTs can be used for nanofluid fluid conveying and hydrogen storage 10. Additionally, CNTs can be used to make composites with metals, cements, and glass fibers to compensate for the inadequacies of each material and create high strength, high performance composites [11,12].…”

Section: Introductionmentioning

confidence: 99%

Wave Behavior Characteristics of Elastically Supported Fluid-Conveying Carbon Nanotubes under the Influence of Magnetic Fields

Deng¹,

Li²,

Lv³

2023

Preprint

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In this work,the wave behaviour propagation of single-walled fluid conveying carbon nanotubes (SWCNT) under longitudinal magnetic fields and elastic foundations is studied, based on the nonlocal strain gradients theory(NSGT). With considertion of surface effect, the governing differential equation are obtained utilising Timoshenko beam theory and Hamilton's variational principle. The influence of small-scale parameters, fluid density, magnetic flux, surrounding elastic medium and surface effects on wave behaviour characteristics of carbon nanotubes are discussed in detail. The numerical results illustrated that with the magnetic flux increase，the phase velocities of the carbon nanotube will increase. When the fluid effects inside the carbon nanotube, the wave frequencies of the system reduces with increase in the non-local coefficient, while promotes with increase in the strain gradient coefficient. In addition, fluid density, surrounding elastic medium and surface effects have meaningful influence on the phase velocity of the system.

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Temperature and size-dependent modeling for predicting mechanical properties of carbon nanotubes

Cited by 11 publications

References 26 publications

Chirality-Dependent and Intrinsic Auxeticity for Single-Walled Carbon Nanotubes

Chirality-Dependent and Intrinsic Auxeticity for Single-Walled Carbon Nanotubes

Recent Advances in Carbon Nanotube Utilization in Perovskite Solar Cells: A Review

Wave Behavior Characteristics of Elastically Supported Fluid-Conveying Carbon Nanotubes under the Influence of Magnetic Fields

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