Hydrogen nanotubes

The calculations were performed at the DFT, B3LYP/6-31G(d) level using Gaussian 03 software [37]. All the pristine and hydrogenated nanotubes were fully optimized within the symmetry constrains. Frequency calculations were carried out for the optimized geometries of (3, 3) and (4,4) SWNTs of nine carbon... 

Figure 3.69 Hydrogenation of carbon nanotubes. The theoreticai structure of a compieteiy hydrogenated nanotube is shown in the lower right corner.

One of us (RES) suggested over two years ago[6] that the resolution to this question lies in the electric field inherent to the arc plasma. As argued then, neither thermal nor concentration gradients are close to the magnitudes required to influence tip annealing, and trace impurities such as hydrogen, which might keep the tip open, should have almost no chemisorption residence time at 3000°C. The fact that w ell-formed nanotubes are found only in the cathode deposit, where... 

The formation of fullerenes and CNTs has also been affected by their environmental atmosphere [22] and, in particular, a hydrogen atmosphere plays an important role in forming graphitic structures of multi-walled CNTs (MWCNTs) in the form of buckybundles [24]. Intercalation into MWCNTs has been difficult or impossible, because there is no space for intercalants to enter into a Russian-doll-type structure of the nanotubes. However, the buckybundles formed in the hydrogen arc discharge were found to be successfully intercalated with potassium and ferric chloride (FeCl3) without breaking the... 

Case - Use of Carbon Nanotube-Based Catalysts in Hydrogen Production... 

In the near future, the possible synthesis of nanotubes with solid-gas potential will be more favorable to adsorption. The effect of hydrogen overpressure on the stability of adsorbed Ha needs to be verified in the near future. The high-purity nanotube produced by laser vaporization, catalytic decomposition, or other techniques should be investigated. It is noteworthy that the synthesis of the SWNT with defined diameters and distances between the walls is difficult to perform at present, but future synthesis routes will allow more... 

Screening of metal oxide catalysts for carbon nanotubes and hydrogen production via catalytic decomposition of methane... 

Khan, M.A. and Yang, O.B. (2009) Photocatalytic water splitting for hydrogen production under visible lighton Ir and Co ionized titania nanotube. Catalysis Today, 146 (1-2), 177-182. 

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