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Three-body interactions in complex fluids: virial coefficients from simulation finite-size effects.
Douglas J Ashton1, Nigel B Wilding1
1Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.
This study introduces a simulation method to measure three-body interactions in complex fluids. It quantifies how these interactions affect thermodynamic properties in coarse-grained models.
Area of Science:
- Computational physics
- Statistical mechanics
- Soft matter physics
Background:
- Coarse-grained models simplify complex fluids but often neglect three-body interactions.
- Accurate thermodynamic properties require accounting for multi-body interactions.
Purpose of the Study:
- To develop a simulation technique for quantifying three-body interactions in coarse-grained fluid models.
- To assess the impact of these interactions on thermodynamic properties.
Main Methods:
- A novel approach to determine virial coefficients from structural function asymptotes.
- Comparing third virial coefficients (B3) between complex fluids and simplified models.
- Applicable to Molecular Dynamics and Monte Carlo simulations.
Main Results:
- Quantified three-body effects in star polymer models.
- Measured three-body effects in colloid-polymer mixtures.
- Demonstrated the method's utility in systems with size asymmetry.
Conclusions:
- The developed simulation technique effectively quantifies three-body effects.
- This method enhances the accuracy of coarse-grained fluid simulations.
- Provides insights into the thermodynamics of complex soft matter systems.
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