Modified classical homogeneous nucleation theory and a new minimum in free energy change. 2. Behavior of free energy change with a minimum calculated for various systems

K. Wasai, G. Kaptay, K. Mukai, N. Shinozaki

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In the previous study, modified classical homogeneous nucleation theory considering the free energy change in parent phase was developed, which revealed the presence of a minimum in nucleation curve (the curve of total free energy change versus nuclear radius) of binary solution. In the present study, using the modified theory, numerical calculations were performed for other various systems; liquid and solid solution systems with compound nuclei and mixed gas systems with liquid nuclei. The calculated results also proved the presence of a minimum in each nucleation curve of these various systems. The minimum in nucleation curves has been passed unnoticed by many researchers in various fields. Therefore, Kevin equation is misunderstood as it describes the maximum state. However, it should be the minimum state that Kelvin equation describes. The large difference between the critical radius size of water droplet calculated at the maximum point (17 Å at 200% humidity) and the observed micron order size of water droplet in cloud and fog can be explained through considering that the micron order droplet should be in the minimum state. The contradiction comes from the misunderstanding that a nucleation curve has only a maximum. Therefore, it is essential to review the various nucleation phenomena on the standpoint of the presence of a minimum. The influence of the change of initial content, initial pressure, interfacial tension, and number of nuclei in 1 mol system to the behavior of nucleation curve was discussed.

Original languageEnglish
Pages (from-to)55-61
Number of pages7
JournalFluid Phase Equilibria
Volume255
Issue number1
DOIs
Publication statusPublished - Jul 1 2007

Fingerprint

Free energy
Nucleation
free energy
nucleation
curves
nuclei
fog
radii
Water
Liquids
Fog
liquids
water
Surface tension
humidity
Solid solutions
Atmospheric humidity
interfacial tension
solid solutions
Gases

Keywords

  • Classical homogeneous nucleation theory
  • Cloud
  • Critical nucleus
  • Fog
  • Minimum of free energy

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry

Cite this

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abstract = "In the previous study, modified classical homogeneous nucleation theory considering the free energy change in parent phase was developed, which revealed the presence of a minimum in nucleation curve (the curve of total free energy change versus nuclear radius) of binary solution. In the present study, using the modified theory, numerical calculations were performed for other various systems; liquid and solid solution systems with compound nuclei and mixed gas systems with liquid nuclei. The calculated results also proved the presence of a minimum in each nucleation curve of these various systems. The minimum in nucleation curves has been passed unnoticed by many researchers in various fields. Therefore, Kevin equation is misunderstood as it describes the maximum state. However, it should be the minimum state that Kelvin equation describes. The large difference between the critical radius size of water droplet calculated at the maximum point (17 {\AA} at 200{\%} humidity) and the observed micron order size of water droplet in cloud and fog can be explained through considering that the micron order droplet should be in the minimum state. The contradiction comes from the misunderstanding that a nucleation curve has only a maximum. Therefore, it is essential to review the various nucleation phenomena on the standpoint of the presence of a minimum. The influence of the change of initial content, initial pressure, interfacial tension, and number of nuclei in 1 mol system to the behavior of nucleation curve was discussed.",
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AU - Shinozaki, N.

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N2 - In the previous study, modified classical homogeneous nucleation theory considering the free energy change in parent phase was developed, which revealed the presence of a minimum in nucleation curve (the curve of total free energy change versus nuclear radius) of binary solution. In the present study, using the modified theory, numerical calculations were performed for other various systems; liquid and solid solution systems with compound nuclei and mixed gas systems with liquid nuclei. The calculated results also proved the presence of a minimum in each nucleation curve of these various systems. The minimum in nucleation curves has been passed unnoticed by many researchers in various fields. Therefore, Kevin equation is misunderstood as it describes the maximum state. However, it should be the minimum state that Kelvin equation describes. The large difference between the critical radius size of water droplet calculated at the maximum point (17 Å at 200% humidity) and the observed micron order size of water droplet in cloud and fog can be explained through considering that the micron order droplet should be in the minimum state. The contradiction comes from the misunderstanding that a nucleation curve has only a maximum. Therefore, it is essential to review the various nucleation phenomena on the standpoint of the presence of a minimum. The influence of the change of initial content, initial pressure, interfacial tension, and number of nuclei in 1 mol system to the behavior of nucleation curve was discussed.

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