Journal ArticleDOI
Exceptionally high Young's modulus observed for individual carbon nanotubes
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TLDR
In this article, the amplitude of the intrinsic thermal vibrations of isolated carbon nanotubes was measured in the transmission electron microscopy (TEM) and it was shown that they have exceptionally high Young's moduli, in the terapascal (TPa) range.Abstract:
CARBON nanotubes are predicted to have interesting mechanical properties—in particular, high stiffness and axial strength—as a result of their seamless cylindrical graphitic structure1–5. Their mechanical properties have so far eluded direct measurement, however, because of the very small dimensions of nanotubes. Here we estimate the Young's modulus of isolated nanotubes by measuring, in the transmission electron microscope, the amplitude of their intrinsic thermal vibrations. We find that carbon nanotubes have exceptionally high Young's moduli, in the terapascal (TPa) range. Their high stiffness, coupled with their low density, implies that nanotubes might be useful as nanoscale fibres in strong, lightweight composite materials.read more
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Enhancement of Hc2 and Jc by carbon-based chemical doping
Wai Kong Yeoh,Shi Xue Dou +1 more
TL;DR: In this paper, the effect of carbon doping on magnetic field and upper critical field of MgB 2 is reviewed and the dual reaction model proposed by the authors provides a comprehensive understanding of the mechanism of enhancement in J c and H c2 by chemical doping.
Journal ArticleDOI
Controllable Assembly of Ordered Semiconductor Ag2S Nanostructures
Feng Gao,Qingyi Lu,Dongyuan Zhao +2 more
TL;DR: In this paper, a direct and simple one-step route has been demonstrated to control the organization of semiconductor Ag2S nanocrystals, and several superstructures including hexagonal, quasi-orthogonal, and chain-like arrays assembled from Ag 2S nanoparticles, and hexagonal structures assembled from AG 2S nanorods have been synthesized at low temperature by directly using inorganic compounds AgNO3 and Na2S as the reactants and dodecylthiol as the structuredirecting agent.
Journal ArticleDOI
A new purification method of single-wall carbon nanotubes using H2S and O2 mixture gas
TL;DR: In this article, a purification process of single-wall carbon nanotubes (SWNTs) combining both the acid treatment to remove metal particles and the gas-phase purification to remove impurity carbon particles has been developed.
Journal ArticleDOI
Carbon Nanotube Synthesis: A Review
Carole E. Baddour,Cedric Briens +1 more
TL;DR: In this paper, the authors reviewed three methods of synthesizing the nanomaterial, namely arc discharge, laser ablation and fixed bed/fluidized bed catalytic.
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Fracture Nucleation in Single-Wall Carbon Nanotubes Under Tension: A Continuum Analysis Incorporating Interatomic Potentials
TL;DR: In this article, a continuum theory of fracture nucleation in single-walled carbon nanotubes was developed by incorporating interatomic potentials between carbon atoms into a continuum constitutive model for the nanotube wall.
References
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Book
Advanced Engineering Mathematics
TL;DR: This book discusses ODEs, Partial Differential Equations, Fourier Series, Integrals, and Transforms, and Numerics for ODE's and PDE's, as well as numerical analysis and potential theory, and more.
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Large-scale synthesis of carbon nanotubes
TL;DR: In this article, the authors used a variant of the standard arc-discharge technique for fullerene synthesis under a helium atmosphere, where a carbonaceous deposit formed on one of the graphite rods, consisting of a macroscopic (diameter of about 5 mm) cylinder.
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Advanced Engineering Mathematics. ByErwin Kreyszig. Pp. xx, 899. 68s. (Wiley.)
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Energetics of Nanoscale Graphitic Tubules
TL;DR: It is found that the strain energy per carbon relative to an unstrained graphite sheet goes as the inverse square of the tubule radius, R, and is insensitive to other aspects of the lattice structure, indicating that relationships derivable from continuum elastic theory persist well into the small radius limit.
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Growth, Structure, and Properties of Graphite Whiskers
TL;DR: Graphite whiskers have been grown in a dc arc under a pressure of 92 atmospheres of argon and at 3900°K as discussed by the authors, with recoverable lengths up to 3 cm. They are embedded in a solid matrix of graphite which builds up by diffusion of carbon vapor from the positive to the negative electrode.