The role of vacancy defects and holes in the fracture of carbon nanotubes

Mielke, Steven L.; Troya, Diego; Zhang, Sulin; Li, Je Luen; Xiao, Shaoping; Car, Roberto; Ruoff, Rodney S.; Schatz, George C.; Belytschko, Ted

doi:10.1016/j.cplett.2004.04.054

Cited by 352 publications

(266 citation statements)

References 35 publications

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“…Hou and S.P. Xiao,submitted,13]. Therefore, we believe that vacancy defects have significant effects on the resonance frequencies of nanotube-based torsional oscillators.…”

Section: Resultsmentioning

confidence: 95%

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Multiscale modeling and simulation of nanotube-based torsional oscillators

Xiao

Hou

2006

Nanoscale Res Lett

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In this paper, we propose the first numerical study of nanotube-based torsional oscillators via developing a new multiscale model. The edge-to-edge technique was employed in this multiscale method to couple the molecular model, i.e., nanotubes, and the continuum model, i.e., the metal paddle. Without losing accuracy, the metal paddle was treated as the rigid body in the continuum model. Torsional oscillators containing (10,0) nanotubes were mainly studied. We considered various initial angles of twist to depict linear/nonlinear characteristics of torsional oscillators. Furthermore, effects of vacancy defects and temperature on mechanisms of nanotube-based torsional oscillators were discussed.

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“…Hou and S.P. Xiao,submitted,13]. Therefore, we believe that vacancy defects have significant effects on the resonance frequencies of nanotube-based torsional oscillators.…”

Section: Resultsmentioning

confidence: 95%

“…Vacancy defects can be caused by ion irradiation, absorption of electrons, or nanotube fabrication processes. Such defects are modeled by taking out atoms, followed by bond reconstruction [13]. In this paper, we consider two uncertainties associated with vacancy defects on nanotubes.…”

Section: Resultsmentioning

confidence: 99%

Multiscale modeling and simulation of nanotube-based torsional oscillators

Xiao

Hou

2006

Nanoscale Res Lett

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“…that defects in SWCNTs and chain dissociation of PVA were not generated at the microscopic scale. It was reported that defects introduced by oxidative pitting during composite preparation markedly reduce fracture strength, and extensive pitting leads to lower modulus [22,23]. Moreover, the other potential source of large defects of nanotubes was found by the use of sonication that caused strength underperformance [11].…”

Section: Resultsmentioning

confidence: 99%

Fabrication of high strength PVA/SWCNT composite fibers by gel spinning

Uddin

Aoki

et al. 2010

Carbon

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High-strength composite fibers were prepared from polyvinyl alcohol (PVA) (Degree of polymerization: 1500) reinforced by single-walled carbon nanotubes (SWCNTs) containing few defects. The SWCNTs were dispersed in a 10 wt.% PVA/dimethylsulfoxide solution using a mechanical homogenizer that reduced the size of SWCNT aggregations to smaller bundles. The macroscopically homogeneous dispersion was extruded into cold methanol to form fibers by gel spinning followed by a hot-drawing. The tensile strength of the well-oriented composite fibers with 0.3 wt.% SWCNTs was 2.2 GPa which is extremely high value among PVA composite fibers ever reported using a commercial grade PVA. The strength of neat PVA fibers prepared by the same procedure was 1.7 GPa. Structural analysis showed that the PVA component in the composite fibers possessed almost the same structure as that of neat PVA fibers.Hence a small amount of SWCNTs straightforward enhanced by 0.5 GPa the tensile strength of PVA fibers. The results of mechanical properties and Raman spectra for the SWCNT composites suggest the relatively good interfacial adhesion of the nanotubes and PVA that improves the load transfer from the polymer matrix to the reinforcing phase.-3 -

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“…Such an increase in E is in contrast to a number of previous observations of a radiation-induced decrease in E for individual CNTs, attributed to defect production. [26][27][28][29] This apparent inconsistency could be reconciled by noting that, in addition to the properties of the material forming aerogel nanoligaments (i.e., CNT bundles decorated and cross-linked by graphitic nanoparticles in the the case of CNT-CAs), mechanical properties of aerogels are determined by the monolith density as well as by the geometry, size, and network connectivity of nanoligaments. [11][12][13][14][15]25 The irradiation-induced improvement in E revealed by Figs.…”

Section: Resultsmentioning

confidence: 99%

Heavy-ion-induced modification of structural and mechanical properties of carbon-nanotube aerogels

Charnvanichborikarn¹,

Worsley²,

Shin³

et al. 2013

Carbon

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We study the effect of 2 MeV Xe + ion bombardment at room temperature on the microstructure and mechanical properties of cross-linked carbon-nanotube-based nanoporous carbons. Irradiation causes a gradual densification and a decrease in the surface roughness of monoliths, an increase in Young's modulus and failure stress, a decrease in the failure strain, and smoothening of nanoligament surfaces. Our results demonstrate a potential of heavy-ion bombardment for a controlled modification of nanoporous carbons.

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The role of vacancy defects and holes in the fracture of carbon nanotubes

Cited by 352 publications

References 35 publications

Multiscale modeling and simulation of nanotube-based torsional oscillators

Multiscale modeling and simulation of nanotube-based torsional oscillators

Fabrication of high strength PVA/SWCNT composite fibers by gel spinning

Heavy-ion-induced modification of structural and mechanical properties of carbon-nanotube aerogels

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