Fractal properties of cluster of colloidal magnetic particles

  • R. Pastor-Satorras
  • J. M. Rubí
New In Colloid Science
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 110)


We have studied the properties of clusters of colloidal magnetic particles generated from a 2D aggregation model with dipolar interparticle interactions. Particles diffuse off-lattice, experiencing dipolar 1 with the already attached particles until either they stick to the cluster or wander far away and are removed. Our results are interpreted in terms of a fractal dimension that is a monotonically decreasing function of the temperature, varying between a definite value close to 1 at T=0, and the limit T → ∞, corresponding to free diffusion-limited aggregation. By analyzing orientational correlation functions, an ordered state is found at low temperatures; this state is destroyed by the fractal disorder generated at high T. Our study could be relevant in understanding aggregation of dipolar colloids and phase transitions in Langmuir monolayers.

Key words

Magnetic particles ferrofluids cluster aggregation dipolar interactions 


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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1998

Authors and Affiliations

  • R. Pastor-Satorras
    • 1
  • J. M. Rubí
    • 2
  1. 1.Department of Earth, Atmospheric and Planetary SciencesMassachusetts Institute of TechnologyCambridgeUSA
  2. 2.Department de Física Fonamental Facultat de FísicaUniversitat de BarcelonaBarcelonaSpain

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