Abstract
Structure formation and chain dynamics in a dilute, monodisperse ferrofluid emulsion under the influence of an external magnetic field have been studied using dynamic light scattering. Chain formation is found to be a diffusion-limited process that is well described by the Smoluchowski theory of irreversible aggregation. The characteristic time on which chain formation occurs depends strongly on volume fraction and on magnetic field strength. Rescaling the time leads to a universal behavior. Internal chain dynamics i.e.chain fluctuations are revealed by measurements of the apparent short-time diffusion coefficient as a function of the scattering angle. They show a strong dependence on the strength of the applied magnetic field.
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