“…First the intruding may occur more probably, because it is expected that the values of γ AO and γ AW + γ OW approach each other with increasing hydrocarbon chain length of the alcohol, judging from our previous results given in ref , where γ AO , γ AW , and γ OW denote the interfacial tensions of the air/alcohol (A/O), air/water (A/W), and alcohol/water (O/W) interfaces, respectively. Second, it has been proved that the 1-undecanol/water and 1-dodecanol/water interfacial films exhibit the phase transition between the expanded and condensed states. , The interfacial tension and dihedral angle were measured as a function of temperature. Then the states and phase transition of the interfacial films, the wetting behavior, the intruding phenomenon, and the mutual relation among them are discussed thoroughly.…”