Résumé
This chapter investigates melting in the layers adsorbed in hypothetical single wall armchair carbon nanotube of diameter d = 4 nm. The investigation was limited to partially filled pores, where only one or two layers were adsorbed. Although the adsorbed system was krypton, most of the qualitative observation is valid in many other similar systems. In general, melting temperature depends on a thermodynamic path chosen in the (p,T) space. The melting temperature of a monolayer adsorbed in the pore is lower than the temperature of the 3D triple point. However, the adsorption of the second layer pushes the temperature of melting of the contact layer up. The two-layer system behaves in a very heterogeneous way, that is, the melting of the second layer is observed at totally different temperature than the first one. In the case of krypton in carbon nanotubes, this temperature is even lower than the one observed for the monolayer system.