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• W2021932338 abstract "The Van der Waals-Cahn-Hilliard gradient theory (GT) is applied to determine the structure and the work of formation of clusters in supersaturated n-nonane vapor. The results are analyzed as functions of the difference of pressures of the liquid phase and vapor phase in chemical equilibrium, which is a measure for the supersaturation. The surface tension as a function of pressure difference shows first a weak maximum and then decreases monotonically. The computed Tolman length is in agreement with earlier results [L. Granasy, J. Chem. Phys. 109, 9660 (1998)] obtained with a different equation of state. A method based on the Gibbs adsorption equation is developed to check the consistency of GT results (or other simulation techniques providing the work of formation and excess number of molecules), and to enable an efficient interpolation. A cluster model is devised based on the density profile of the planar phase interface. Using this model we analyze the dependency of the surface tension on the pressure difference. We find three major contributions: (i) the effect of asymmetry of the density profile resulting into a linear increase of the surface tension, (ii) the effect of finite thickness of the phase interface resulting into a negative quadratic term, and (iii) the effect of buildup of a low-density tail of the density profile, also contributing as a negative quadratic term. Contributions (i)-(iii) fully explain the dependency of the surface tension on the pressure difference, including the range relevant to nucleation experiments. Contributions (i) and (ii) can be predicted from the planar density profile. The work of formation of noncritical clusters is derived and the nucleation rate is computed. The computed nucleation rates are closer to the experimental nucleation rate results than the classical Becker-Döring theory, and also the dependence on supersaturation is better predicted." @default.
• W2021932338 created "2016-06-24" @default.
• W2021932338 creator A5018284816 @default.
• W2021932338 creator A5040720407 @default.
• W2021932338 creator A5042222499 @default.
• W2021932338 date "2007-10-28" @default.
• W2021932338 modified "2023-10-01" @default.
• W2021932338 title "Gradient theory computation of the radius-dependent surface tension and nucleation rate for n-nonane clusters" @default.
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• W2021932338 doi "https://doi.org/10.1063/1.2799515" @default.
• W2021932338 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17979384" @default.
• W2021932338 hasPublicationYear "2007" @default.
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