title: 4He adsorbed on the outer surface of carbon nanotube bundles.
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.
authors.affiliation: Departamento de Sistemas Físicos, Químicos y Naturales. Facultad de Ciencias Experimentales, Universidad Pablo de Olavide, Carretera de Utrera, km 1. 41013 Sevilla, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: Gordillo