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Crossover in growth laws for phase-separating binary fluids: molecular dynamics simulations.

Shaista Ahmad¹, Subir K Das, Sanjay Puri

¹Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Post Office, Bangalore, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|May 17, 2012

Summary

This summary is machine-generated.

Phase separation in binary fluids shows bicontinuous domains. Domain growth follows Lifshitz-Slyozov laws then transitions to viscous hydrodynamics, dependent on temperature.

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Area of Science:

Soft Matter Physics
Thermodynamics
Computational Physics

Background:

Phase separation is crucial in materials science and fluid dynamics.
Understanding domain morphology and growth dynamics informs material design.
Previous studies often focused on solid mixtures or different fluid compositions.

Purpose of the Study:

Investigate pattern formation and dynamics during phase separation in a binary Lennard-Jones fluid.
Characterize domain morphology and growth kinetics below the critical temperature.
Compare fluid phase separation with solid binary mixtures.

Main Methods:

Molecular dynamics simulations of a symmetrical (A+B) binary Lennard-Jones fluid.
Quenching homogeneously mixed critical (50:50) systems to subcritical temperatures.
Analysis of domain size, morphology, and growth laws over time.

Main Results:

Observed bicontinuous domain morphology for both A-rich and B-rich phases.
Early-time domain growth aligns with the Lifshitz-Slyozov law for diffusive coarsening.
Crossover to a viscous hydrodynamic regime with linear domain growth observed after a characteristic time.
Temperature dependence of growth dynamics and finite-size/temperature effects on scattering functions were analyzed.

Conclusions:

The study elucidates the distinct stages of pattern formation and domain coarsening in binary fluid mixtures.
Findings highlight the transition from diffusive to hydrodynamic growth regimes.
Comparison with solid mixtures provides insights into universal and system-specific phase separation behaviors.