Abstract
A brief theoretical consideration is given to the effect of two-dimensional critical nucleus size on interfacial tension using a one layer adsorption model based on the Bragg-Williams approximation with empty sites. The correction term due to the dependence of interfacial tension on cluster size is calculated and the exact expression for determining the size of the critical nucleus is established. It is found that the surface free energy required to form a stable nucleus is more than that of the classical nucleus and the difference between these two values may increase or decrease with the increase in the size of the nucleus, depending on the energy of interaction between the adsorbed molecules.
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