Graphitization of single-wall nanotube bundles at extreme conditions: Collapse or coalescence route

Graphitization of single-wall nanotube bundles at extreme conditions: Collapse or coalescence route

Novel polygonized single-wall carbon nanotube bundles.

We have synthesized novel crystalline ropes of "polygonized" single-wall carbon nanotubes (SWCNTs). The tubes exhibit rounded-hexagonal cross sections in contrast to the earlier observations of nearly circular tubes. To investigate the structural characteristics of the lattice of SWCNTs we have performed extensive molecular-dynamics simulations. We find several metastable structures of the latt...

Pressure Effects on Single Wall Carbon Nanotube Bundles

We report high pressure Raman studies on single wall carbon nanotube bundles under hydrostatic conditions using two different pressure transmitting media, alcohol mixture and pure water. The radial and tangential modes show a blue shift when SWNT bundle is immersed in the liquids at ambient pressures. The pressure dependence of the radial modes is the same in both liquids. However, the pressure...

Collapse of double-walled carbon nanotube bundles under hydrostatic pressure

Vikram Gadagkar,1 Prabal K. Maiti,2,* Yves Lansac,3 A. Jagota,4 and A. K. Sood1,* 1Department of Physics, Indian Institute of Science, Bangalore 560012, India 2Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India 3LEMA, UMR 6157 CNRS-CEA, Université François Rabelais, 37200 Tours, France 4Department of Chemical Engineering, Lehigh Unive...

Adsorption of He atoms in external grooves of single wall carbon nanotube bundles

I calculate the quantum states for He atom in the potential of an external groove of the single wall carbon nanotube bundle. The calculated ground state energy is found to be in fair agreement with the experimental estimate which suggests that the outer groove site is a preferential site for the adsorption of He gas in the samples studied experimentally. I also calculate the specific heat of lo...