Critical Cluster Content in High-pressure Binary Nucleation: Compensation Pressure Effect
Nucleation experiments in binary (a-b) mixtures, when component a is supersaturated and b (carrier gas) is undersaturated, reveal that for some mixtures at high pressures the a-content of the critical cluster dramatically decreases with the pressure contrary to the expectations based on the Classical Nucleation Theory. We show that this phenomenon is a manifestation of the dominant role of the unlike interactions at high pressures resulting in the negative partial molar volume of component a in the vapor phase beyond the compensation pressure. The analysis is based on the Pressure Nucleation Theorem (PNT) for multicomponent systems which is invariant to a nucleation model.
Keywords Binary nucleation, Nucleation theorem, cluster composition, compensation pressure effect
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