Abstract
A surprising observation concerning the vapor-liquid interface in the mixture phenol + water has been confirmed. An ellipsometric study of this mixture shows no indication of a thick wetting layer at the vapor-liquid interface when the mixture undergoes a transition from one into two liquid phases. The behavior in this system is markedly different from that of alcohol + fluorocarbon systems studied with the same technique in which layers form that can be hundreds of angstroms thick. By contrast in this system hundreds of tiny droplets form at the vapor-liquid interface and persist for many hours both in thermally equilibrated and in steadily cooled samples. Ellipticity values from equilibrated samples when interpreted via a slab model yield film thickness of only two or three monolayers.
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