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Particle interactions and rotational diffusion significantly impact aggregate structure. Repulsive forces lead to more compact aggregates, while attractive forces have minimal effect on aggregation mechanisms or final structure.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Physics

Background:

  • Understanding particle aggregation is crucial for colloid science and materials design.
  • Previous models often neglect the role of rotational diffusion in cluster formation.
  • The influence of inter-particle potentials on aggregate structure requires further investigation.

Purpose of the Study:

  • To simulate irreversible particle aggregation, considering rotational diffusion.
  • To investigate the effects of attractive and repulsive inter-particle potentials on aggregation.
  • To compare simulation results with established models and experimental data.

Main Methods:

  • Irreversible aggregation simulations were performed.
  • Rotational diffusion of aggregating clusters was explicitly implemented.
  • Particles interacted via repulsive and attractive potentials, or were non-interacting.

Main Results:

  • Attractive potentials did not alter aggregation mechanism or aggregate structure compared to non-interacting particles.
  • Repulsive particles formed more compact aggregates.
  • Aggregate fractal dimension and aggregation times increased with decreasing temperature for repulsive particles.

Conclusions:

  • Particle attraction has a negligible impact on aggregation outcomes.
  • Repulsive interactions and temperature significantly influence aggregate morphology and kinetics.
  • The study reconciles simulation findings with experimental observations by accounting for rotational diffusion.