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We present a computer simulation study of a (6,12)-Lennard-Jones fluidconfined to a slit pore, formed by two uniform planes. These interact via(3,9)-Lennard-Jones potential with the fluid particles. When the fluidapproaches the liquid-to-solid transition we first observe layering parallel tothe walls. In order to investigate the nature of the freezing transition weperformed a detailed analysis of the bond-orientational order parameter in thelayers. We found no signs of hexatic order which would indicate a meltingscenario of the Kosterlitz-Thouless type. An analysis of the mean-squaredisplacement shows that the particles can easily move between the layers,making the crystallization a 3d-like process. This is consistent with the factthat we observe a considerable hysteresis in the heating-freezing curves,showing that the crystallization transition proceeds as an activated process.

2D versus 3D Freezing of a Lennard-Jones Fluid in a Slit Pore: A Molecular Dynamics Study