Elucidation of the effect of domain boundary on the mechanism of surface freezing phenomena

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Surface freezing (SF) is the phenomenon of the two-dimensional condensed film formation at liquid surface at temperature Ts which is a few degrees above the bulk freezing temperature Tb. Deutsch et al. have claimed that liquid alkanes with 16~50 carbon atoms and alkanols with 10~28 ones exhibit SF phenomena. In this study, we aim at discussing the miscibility of molecules at the surface of the binary liquid mixture of hydrocarbon and fluorocarbon compounds from the viewpoint of the mutual interaction between the film forming molecules by surface tensiometry and X-ray reflection.The estimation of surface composition and surface excess thermodynamic quantity and the determination of electron density profile along surface normal indicated followings; (1) the homologous alkane and alcohol molecules with chain length difference by only one mix almost ideally at the surface, (2) hybrid alkane and alkanol with fluorocarbon chain form condensed phase domain in the surface liquid layer, and (2) the molecular distribution in the SF bilayer is heterogeneous in the mixed alkanol - hybrid alkanol system.