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Calculation of solid-liquid interfacial free energy: a classical nucleation theory based approach
1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA. gtg901e@mail.gatech.edu
The Journal of Chemical Physics
|April 8, 2006
Summary
This study introduces a straightforward method to compute solid-liquid interfacial free energy using molecular dynamics simulations. The findings provide a new calculation approach and temperature dependence insights for nucleation processes.
Area of Science:
- Materials Science
- Physical Chemistry
- Computational Physics
Background:
- Calculating solid-liquid interfacial free energy is crucial for understanding nucleation and phase transitions.
- Classical nucleation theory provides a framework, but direct calculation methods are often complex.
Purpose of the Study:
- To develop a simple and effective method for calculating solid-liquid interfacial free energy.
- To investigate the temperature dependence of this interfacial free energy.
Main Methods:
- Employing molecular dynamics simulations with spherical crystal nuclei in supercooled liquids.
- Modeling homogeneous nucleation to create an ideal system.
- Extracting interfacial free energy by fitting critical nucleus size to critical undercooling temperature.
Main Results:
- Determined the orientationally averaged interfacial free energy to be 0.302+/-0.002 (LJ unit).
- Observed that interfacial free energy slightly increases with increasing temperature.
- Found a positive temperature coefficient for interfacial free energy.
Conclusions:
- The developed method offers a simple approach to calculate solid-liquid interfacial free energy.
- The results align with existing theories and empirical estimations regarding temperature dependence.
- This work contributes to a better understanding of nucleation phenomena in materials.
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