AUTHORS: Ana Oprisan, Ashley Rice, Gabrielle Seymore

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ABSTRACT: IWe performed two shadowgraph-based experiments using superparamagentic nanocolloids to investigate the effect of a horizontal magnetic field on the intensity of concentration - enhanced non-equilibrium fluctuations (c-NEFs). The experiments were performed on Earth with a concentration gradient oriented vertically upward under the influence of a horizontal (perpendicular to the concentration gradient) external magnetic field. We used a shadowgraph method to record c-NEFs and a differential dynamic algorithm (DDA) to investigate quantitatively the changes in the structure factor and the correlation time of c-NEFs. We found that the diffusion coefficient transiently decreases when the magnetic field is turned on/off presumably due to the formation/destruction of paramagnetic clusters

KEYWORDS: Diffusion and aggregation, magnetic nanoparticles, complex fluids, thermodynamics of nonequilibrium processes

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