4He adsorbed on the outer surface of carbon nanotube bundles |
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Authors: | Gordillo M C |
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Institution: | Departamento de Sistemas Físicos, Químicos y Naturales. Facultad de Ciencias Experimentales, Universidad Pablo de Olavide, Carretera de Utrera, km 1. 41013 Sevilla, Spain. |
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Abstract: | The results of diffusion Monte Carlo calculations on the behavior of 4He 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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