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Free energy of cluster formation and a new scaling relation for the nucleation rate

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/57529

Title: Free energy of cluster formation and a new scaling relation for the nucleation rate
Authors: Tanaka, Kyoko K Browse this author →KAKEN DB
Diemand, Jürg Browse this author
Angélil, Raymond Browse this author
Tanaka, Hidekazu Browse this author →KAKEN DB
Issue Date: 2014
Publisher: American Institute of Physics
Journal Title: Journal of Chemical Physics
Volume: 140
Issue: 19
Start Page: 194310
Publisher DOI: 10.1063/1.4875803
PMID: 24852541
Abstract: Recent very large molecular dynamics simulations of homogeneous nucleation with (1 − 8) × 109 Lennard-Jones atoms [J. Diemand, R. Angélil, K. K. Tanaka, and H. Tanaka, J. Chem. Phys.139, 074309 (2013)] allow us to accurately determine the formation free energy of clusters over a wide range of cluster sizes. This is now possible because such large simulations allow for very precise measurements of the cluster size distribution in the steady state nucleation regime. The peaks of the free energy curves give critical cluster sizes, which agree well with independent estimates based on the nucleation theorem. Using these results, we derive an analytical formula and a new scaling relation for nucleation rates: ln J′/η is scaled by ln S/η, where the supersaturation ratio is S, η is the dimensionless surface energy, and J′ is a dimensionless nucleation rate. This relation can be derived using the free energy of cluster formation at equilibrium which corresponds to the surface energy required to form the vapor-liquid interface. At low temperatures (below the triple point), we find that the surface energy divided by that of the classical nucleation theory does not depend on temperature, which leads to the scaling relation and implies a constant, positive Tolman length equal to half of the mean inter-particle separation in the liquid phase.
Rights: Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Chem. Phys. 140, 194310 (2014) and may be found at http://dx.doi.org/10.1063/1.4875803.
Type: article
URI: http://hdl.handle.net/2115/57529
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田中 今日子

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