Abstract
In this work, we report a systematic comparison between three-dimensional Monte Carlo simulations and magnetic resonance measurements of polydisperse Fe3O4 based nanoparticles. Magnetization curves clearly show the validity of the simple model employed by us. Our theoretical results are then compared to real ferrofluids samples that have been experimentally characterized by transmission electron microscopy and magnetic resonance measurements. Our data indicates that the number of surfactant molecules and its physical distribution (grafting) decisively affects the surface-surface particle distance within an agglomerate. Two different grafting regimes are clearly identified from our theoretical data.
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