Abstract
Droplets of aqueous solutions of trivalent lanthanide ions (Ln3+) were formed inside an immiscible fluid. The motion of the droplets, induced by the magnetic field of a Nd–Fe–B permanent magnet, was measured. By using the relationship between the magnetophoretic velocity, the magnetic force, and the frictional coefficient, a good estimate of the magnetic susceptibility was obtained. The impact of the magnetic susceptibility of each Ln3+ ion on the magnetophoresis was analyzed. Additionally, the influence of droplet volume, concentration. and magnetic field strength was also studied. A forward motion toward regions of stronger magnetic field was observed for droplets of paramagnetic solutions, while no motion was detected for droplets of diamagnetic solutions. The average droplet velocity for the different Ln3+ ions across the lanthanide series follows a binodal-shaped curve, which corresponds to the change of the magnetic susceptibility of Ln3+ as a function of the atomic number. Strongly paramagnetic ion...
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