Abstract
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.
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© 1998 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Pastor-Satorras, R., Rubí, J.M. (1998). Fractal properties of cluster of colloidal magnetic particles. In: Koper, G.J.M., Bedeaux, D., Cavaco, C., Sager, W.F.C. (eds) Trends in Colloid and Interface Science XII. Progress in Colloid & Polymer Science, vol 110. Steinkopff. https://doi.org/10.1007/BFb0118043
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DOI: https://doi.org/10.1007/BFb0118043
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