Abstract
We study the wetting behavior at the free surface of the isotropic phase of various mixtures of two thermotropic liquid crystal compounds. Both pure compounds show complete wetting of the isotropic liquid-vapor interface by an interposing anisotropic phase when the transition to the bulk liquid-crystal phase is approached, but only one of the compounds shows in addition a discontinuous prewetting transition. The prewetting discontinuity is found to vanish at a critical point in the temperature-composition plane.
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