WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 17, 2018
Anisotropic Effect of an External Magnetic Field on Non-Equilibrium Concentration Fluctuations in Nanoparamagnetics
Authors: , ,
Abstract: We 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.
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Keywords: Diffusion and aggregation, magnetic nanoparticles, complex fluids, thermodynamics of nonequilibrium processes
Pages: 146-158
WSEAS Transactions on Circuits and Systems, ISSN / E-ISSN: 1109-2734 / 2224-266X, Volume 17, 2018, Art. #18