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Relation between aggregation and phase separation: three-dimensional Monte Carlo simulations.

Jean Christophe Gimel1, Taco Nicolai, Dominique Durand

  • 1Polymères Colloïdes Interfaces, CNRS UMR6120, Université du Maine, F-72085 Le Mans cedex 9, France. Jean-Christophe.Gimel@univ-lemans.fr

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 7, 2003
PubMed
Summary
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Monte Carlo simulations reveal two stages of particle phase separation: initial aggregation forming fractal structures and subsequent densification into spherical domains or wormlike strands. The transition is gradual, lacking a clear spinodal signature.

Area of Science:

  • Physical Chemistry
  • Computational Physics
  • Materials Science

Background:

  • Phase separation is crucial in colloid and polymer science.
  • Understanding aggregation kinetics and resulting structures is key.
  • Monte Carlo methods offer a powerful tool for simulating such complex systems.

Purpose of the Study:

  • To investigate the phase separation dynamics of particles in solution.
  • To characterize the structures formed during reversible aggregation.
  • To distinguish between different stages and identify phase boundaries.

Main Methods:

  • Utilizing Monte Carlo simulations on a cubic lattice.
  • Modeling reversible aggregation with controlled interaction energies.
  • Analyzing aggregate morphology and distribution over time.

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Main Results:

  • Observed two distinct stages: initial random aggregation and subsequent densification.
  • Identified fractal aggregates near the binodal and gels for strong attraction in the first stage.
  • Found spherical dense domains or wormlike strands in the second stage, depending on interaction strength.

Conclusions:

  • The phase separation process exhibits a gradual transition without a clear spinodal.
  • The initial aggregation stage can be metastable, especially at high interaction energies.
  • The second stage can be interpreted as an aging process of the initially formed gel.