Aggregation of superparamagnetic colloids in magnetic fields: the quest for the equilibrium state

Details Aggregation of superparamagnetic colloids in magnetic fields: the quest for the equilibrium state Aggregation of superparamagnetic colloids in magnetic fields: the quest for the equilibrium state

2010-11-22

arxiv.org/abs/1011.4819v1

Soft Matter, 2011, 7, 2336-2339

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1039/C0SM01424A

Experimental and simulation studies of superparamagnetic colloids in strong external fields have systematically shown an irreversible aggregation process in which chains of particles steadily grow and the average size increases with time as a power-law. Here we show, by employing Langevin dynamics simulations the existence of a different aggregation behavior: aggregates form during a transient period and the system attains an equilibrium distribution of aggregate sizes. A thermodynamic self-assembly theory supports the simulation results and it also predicts that the average aggregate size in the equilibrium state depends only on a dimensionless parameter combining the volume fraction of colloids phi0 and the magnetic coupling parameter Gamma. The conditions under which this new behavior can be observed are discussed.

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