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Carbon Nanotubes - Astrophysics Data System

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Last Updated: 04 October 2022

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Micro-Crack Bridging Effects on the Tensile and Compressive Strengths of CNT-Epoxy Composites

Both Micro-crack bridging and an optimal method for dispersing carbon nanotubes in the E-glass fabric reinforced polymer matrix are considered. The aim of CNT dispersion in the glass fabric is to obtain the improved mechanical and tunable thermal/dielectric properties. The model illustrates the composite's stiffness degradation and the presence of matrix cracks in the composites. The influence of CNTs on the micro-cracks and the effective stiffness of a laminate's representative volume component shows the effects of CNTs on the micro-cracks and the effective stiffness. Results include improved tensile and compressive properties as a result of improved tensile and compressive properties as a result of specified processing conditions in conjunction with the introduction of dispersant agents, which results in reduced porosity, residual stress, and a consistent dispersion strengthening effect with as low as 0. 1 wt% CNT additions. The treatment of CNTs with ethanol reduces the Van der Waals forces in CNTs and the epoxy matrix viscosity, as shown by CNTs.

Source link: https://ui.adsabs.harvard.edu/abs/2022MCM...tmp...59G/abstract


Carbon Nanotubes/FeSiAl Hybrid Flake for Enhanced Microwave Absorption Properties

A simple method for producing carbon nanotubes/FeSiAl flake composites is developed herein, and in situ growth of CNTs on FeSiAl microscale flakes is established.

Source link: https://ui.adsabs.harvard.edu/abs/2022JEMat.tmp..573L/abstract


Simulations for mechanical properties of polymer composites: investigations into suitability of numerical models for TPU-CNT with Mooney-Rivlin (N =1 ) and friction

The effect of coefficient of friction in numerical simulations is investigated. A simulation experiment to investigate stress relaxation behavior with Maxwell's Prony relaxation parameters is extensive, while the feasibility of including basic hyperelastic models, such as Mooney-Rivlin and Ogden is tested. We found that the hyper-viscoelastic model is the best suited for TPU-CNT with maximum error down to 5% during the stress relaxation phase, in comparison to viscoelastic and hyperelastic models, with 15% and 25% for viscoelastic and hyperelastic models. In comparison to a higher-order Ogden model, the two-parameter first-order equation-based Mooney-Rivlin model fed with uniaxial load test results was suitable for poor strain predictions. We also display the transient stress contours to show how the stress reduction within the composite material would be predicted with each model.

Source link: https://ui.adsabs.harvard.edu/abs/2022MTDM..tmp...53R/abstract


Cobalt Sulfides Encapsulated in MOF-Derived Carbon Nanotubes for Enhanced Lithium Storage

CoS 2 / carbon nanotubes composite was successfully synthesized using the zeolitic imidazolate framework-67 as a precursor to high-temperature treatment and the catalytic activity of metallic CoS 2 nanoparticles, resulting in high specific capacity at high current densities in this research.

Source link: https://ui.adsabs.harvard.edu/abs/2022JEMat.tmp..553X/abstract


Local electronic structure of carbon nanotubes consolidated by spark plasma sintering

By electron paramagnetic resonance, transmission electron microscopy, X-ray photoelectron, and Raman spectroscopy, the local electronic structure of carbon nanotubes was consolidated by spark plasma sintering and further oxidized by nitric acid. Long time oxidation persisted and fragmented sintered CNTs, as well as increased the number of paramagnetic centers, leading to an increase in the number of paramagnetic centers.

Source link: https://ui.adsabs.harvard.edu/abs/2022FML....1551040U/abstract


Mineralize complex organic contaminants using only oxygen on dense copper atoms embedded in the walls of carbon nanotubes

The catalyst was made using Cu single atoms embedded on multiwalled carbon nanotubes, designated as CNTs@Cu SA, with a mass ratio of Cu SA up to 10. 02 percent. With 98 percent organic carbon mineralization, the CNTs@Cu SA mass ratio 8. 39 percent demonstrated a high catalytic efficiency, and 93% of HA in solution was degraded to 98 percent. The results revealed that the Cu-N coordination centers on CNT walls and the confinement effect of CNTs activated O 2 to produce a high activation rate and high activation rates.

Source link: https://ui.adsabs.harvard.edu/abs/2022ApSS..60554760C/abstract


Multi-buffer engineering of nitrogen-doped carbon nanosheets/carbon nanotubes network encapsulated and carbon coated silicon anode for high performance lithium-ion batteries

During cycling, the commercialization of silicon anode is still plagued by unfavorable phenomena such as massive volume expansion, low intrinsic conductivity, and unstable solid electrolyte interface film of Si during cycling. For Sianode's business prospects, designing a simple and scalable synthesis for multi-buffer engineering with different carbon structures is both challenging and difficult. The comparison of two Si anodes shows the importance of the multi-buffering synergistic effect and its wide use in the application of a high-performance anode for lithium-ion batteries.

Source link: https://ui.adsabs.harvard.edu/abs/2022JPS...54832093H/abstract


Effects of process parameters and carbon nanotubes content on microstructure and properties of laser cladding composite coatings using Ni-Ti-Cr-carbon nanotubes

The optical microscope was used to examine the composite coating's metallographic structure, the composite layer's phase composition was determined by XRD, the composite coating's microstructures were determined by SEM, and point distribution and line distribution of elements were investigated by EDS. The TiC modified particles in the composite coatings gradually transitions into coarse dendrites as a result of the increase of laser specific energy and CNTs content. In situ synthesis of TiC particles not only improve the microhardness of the composite coatings, but also increase the coating's wear resistance.

Source link: https://ui.adsabs.harvard.edu/abs/2022MRE.....9i6403Z/abstract


Fabrication of Copper Matrix Composites Reinforced with Carbon Nanotubes Using an Innovational Self-Reduction Molecular-Level-Mixing Method

As a simplified manufacturing process for the manufacturing of carbon nanotube copper matrix composites, an innovative self-reduction molecular-level mixing system was suggested. The surface structure and elemental distribution during the manufacture of CNT/Cu mixing powder was investigated. The CNT/Cu could be made by a high temperature reaction at 900 degrees under vacuum, during which the carbon atoms in the carbon nanotubes reduced the divalent copper on the surface to zero-valent copper monomers, according to the results. Following a self-reduction reaction, the decrease in the ratio of D and G peaks on the Raman spectra showed that the troublesome spots on the carbon nanotubes were wrapped and covered by the copper atoms. The finished CNT/Cu powder powders were uniformly embedded in the copper matrix materials' grain boundaries, effectively blocking the tensile fracture.

Source link: https://ui.adsabs.harvard.edu/abs/2022Mate...15.6488Y/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions