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Lecture 10: Homogeneous Nucleation

1 Lecture 10: Homogeneous Nucleation Today s topics What is Nucleation ? What implied in real practice of materials processing, particularly phase transformation? General comparison between Homogeneous and heterogeneous Nucleation . Critical particle (or nucleus) size (r*) for a Homogeneous Nucleation from liquid ( , solidification of metals). How to derive and understand the critical size in terms of both thermodynamics and kinetics of Nucleation . About Nucleation Nucleation : localized formation of a distinct thermodynamic phase.

The nucleation depicted in the diagram above can be understood in 3 thermodynamic regimes: 1) nucleation from the free molecules or atoms to form small particles (nucleus), e.g., several water molecules form clusters.

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