The radial breathing modes and tangential modes have been systematically measured on a large number of individual semiconducting single-wall carbon nanotubes (thin bundles) suspended between plots (free-standing single-wall carbon nanotubes). The strong intensity of the Raman spectra ensures the precision of the experimentally determined line shapes and frequencies of these modes. The diameter ...

The vibrational properties of single-walled carbon nanotubes reflect the. A common characteristic of the Raman spectra in nanotubes and graphite is the.Resonance Raman spectroscopymicroscopy was used to study individualized single-walled carbon nanotubes. SWNTs both in aqueous suspensions as well.The use of Raman spectroscopy to reveal the remarkable structure and the unusual electronic and. Do...

A combination of ab initio Density Functional and parametrized Linear Combination of Atomic Orbitals calculations is used to describe the interplay between structural and electronic properties of single-wall, multi-wall, and bundled carbon nanotubes. The electronic structure of cylindrical single-and multi-wall tubes with an extremely inhomogeneous charge density is determined self-consistently...

carbon nanotube is investigated based on an elastic multi-layer shell model with van der Waals interaction taken into consideration. The multi-walled carbon nanotube is described as an individual elastic shell and the interlayer friction is negligible between the inner and outer tubes in the proposed model. And the Donnell equations of cylindrical shells are employed to describe the nonlinear b...

The articles highlighted in this issue are “Pulmonary Toxicity of Single-Wall Carbon Nanotubes in Mice 7 and 90 Days after Intratracheal Instillation” by Chiu-Wing Lam, John T. James, Richard McCluskey, and Robert L. Hunter (pp. 126–134) and “Comparative Pulmonary Toxicity Assessment of Single-Wall Carbon Nanotubes in Rats” by D. B. Warheit, B. R. Laurence, K. L. Reed, D. H. Roach, G. A. M. Rey...

Bundles of single-wall carbon nanotubes (SWCNTs) coalesce forming multiwall carbon nanotubes (MWCNTs), containing from two to six nested tubes, under thermal treatment at high temperatures [(2200-2400) degrees C]. This structural transformation is confirmed by extensive molecular dynamics (MD) simulations. The simulations suggest a "patching-and-tearing" mechanism for the single-wall-to-multiwa...

In the present study, continuous adsorption experiments were carried out in an adsorption column to survey the efficiency of the carbon nanotubes (CNTs) for removal of natural organic matters (NOMs) from aqueous solution. Parameters such as mass of CNTs, initial NOMs concentration were evaluated and also the breakthrough curves were obtained. Experiments performed with various initial NOMs conc...

Even though isolated defect-free single-wall carbon nanotubes are straight, bundles of chiral single-wall carbon nanotubes are often helical according to our observations using high-resolution electron microscopy. The driving force for the formation of such helices is the energy gain associated with the optimum orientational alignment of neighboring nanotubes. Our total energy calculations allo...