He4 Adsorbed on the Outer Surface of Carbon Nanotube Bundles
The results of diffusion Monte Carlo calculations on the behavior of He4 adsorbed on the external surface of a bundle of carbon nanotubes are presented. The corrugation effects are found to be very important, making the outside part of the bundles a quite inhomogeneous substrate. No stable solid hel...
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| Format: | article |
| Publication Date: | 2008 |
| Country: | España |
| Institution: | Universidad Pablo de Olavide (UPO) |
| Repository: | RIO. Repositorio Institucional Olavide |
| Language: | English |
| OAI Identifier: | oai:rio.upo.es:10433/934 |
| Online Access: | http://hdl.handle.net/10433/934 |
| Access Level: | Open access |
| Keyword: | Monte Carlo calculations Carbon nanotubes |
| Summary: | The results of diffusion Monte Carlo calculations on the behavior of He4 adsorbed on the external surface of a bundle of carbon nanotubes are presented. The corrugation effects are found to be very important, making the outside part of the bundles a quite inhomogeneous substrate. No stable solid helium monolayer at high density was found. Instead, helium atoms are promoted to a second quasi-one-dimensional phase on top of the liquid first layer. On increasing the helium intake, a two layer structure is formed in which the helium directly in contact with the carbon surface solidifies. |
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