Abstract
Experimental results concerning the binary homogeneous nucleation from the vapor phase of water–alcohols mixtures are reexamined. It is shown that the large discrepancies between theory and experiment can be explained by the fact that, for those mixtures, the use of macroscopic surface tension values is not applicable to binary droplets. A lattice model is developed to describe a microscopic cluster. This allows the determination of the surface monolayer composition, and the calculation of the actual surface tension as a function of the cluster size. The introduction of this model in the classical theory of binary nucleation restores good agreement with the experimental results.
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