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Surfactant effects and an order-disorder transition in binary gas-liquid nucleation
1Department of Physics, University of Helsinki, P.O. Box 9, 00014 Helsinki, Finland.
Physical Review Letters
|October 4, 2000
Summary
Density-functional theory reveals that increased interaction anisotropy between monomers and dimers enhances gas-liquid nucleation. At high dimer concentrations, critical nuclei exhibit a lamellar structure.
Area of Science:
- Physical Chemistry
- Computational Materials Science
Background:
- Gas-liquid nucleation is a fundamental process in phase transitions.
- Understanding nucleation in binary systems is crucial for various industrial applications.
Purpose of the Study:
- To investigate gas-liquid nucleation in a binary system using density-functional theory.
- To explore the effect of interaction anisotropy on nucleation enhancement.
- To characterize the structure of critical nuclei under varying conditions.
Main Methods:
- Application of density-functional theory (DFT).
- Utilizing the interaction site model for molecular simulations.
- Studying a binary system of spherical monomers and dumbbell dimers (Lennard-Jones potentials).
Main Results:
- Increased interaction anisotropy between dimer sites and monomers leads to mutual enhancement of nucleation.
- Observation of critical nuclei with a lamellar structure at high dimer activities.
- Demonstration of the influence of molecular structure on nucleation phenomena.
Conclusions:
- Interaction anisotropy plays a significant role in modulating gas-liquid nucleation in binary mixtures.
- The formation of lamellar structures in critical nuclei is a key finding at high dimer concentrations.
- DFT and the interaction site model provide valuable insights into complex nucleation processes.