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Time-dependent clustering and magnetization in magnetic colloidal suspensions.

Luis R Pérez-Marcos1, Ronal A DeLaCruz-Araujo2,3, Heberth Diestra-Cruz4

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The clustering aggregation process influences magnetic colloidal suspension magnetization. Higher volume fraction and magnetic field interactions enhance magnetization by promoting side-by-side chain coupling.

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Area of Science:

  • Colloid and Surface Chemistry
  • Magnetohydrodynamics
  • Computational Physics

Background:

  • Magnetic colloidal suspensions exhibit complex behavior influenced by particle interactions and external fields.
  • Understanding the relationship between microstructural properties and macroscopic magnetization is crucial for applications.

Purpose of the Study:

  • To analyze the influence of time-dependent clustering aggregation on the transient and equilibrium magnetization of magnetic colloidal suspensions.
  • To investigate how microstructural properties, governed by volume fraction, dipolar coupling, and magnetic field strength, affect magnetization dynamics.

Main Methods:

  • Brownian dynamics simulations were employed to model the magnetic colloidal suspension.
  • Microstructural properties (nucleation-growth factor, mean cluster size, kinetic exponent, radial distribution function) were analyzed.
  • Magnetization in transient and equilibrium regimes was studied in relation to microstructural characteristics and system parameters (volume fraction, dipolar coupling parameter, Langevin parameter).

Main Results:

  • Higher dipolar coupling (λ) and volume fraction (ϕ) values reduce dipolar chain growth in the range 1 < α < 10 due to lateral chain interactions.
  • These lateral interactions promote side-by-side coupling of dipolar chains, enhancing both transient and equilibrium magnetization.
  • Significant discrepancies were observed between simulated equilibrium magnetization and existing predictive models for 0.01 ≤ α ≤ 10.

Conclusions:

  • The study highlights the critical role of clustering aggregation and inter-chain interactions in determining the magnetization of colloidal suspensions.
  • Langevin magnetic susceptibility (χL) can characterize dilute suspensions with strong magnetic interparticle interactions (χL ≥ 0.09).
  • Findings suggest the need for refined models to accurately predict magnetization in these complex magnetic systems.