Retention of Paramagnetic Particles by Magnetite Particle Clusters with Multifunctional Character

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Abstract
The magnetic force exerted by a 3‐D array of five hundred identical magnetite particles (with r m = 400 nm) on two differently sized paramagnetic particles (with r p = 160 and 1000 nm) was investigated to reveal the multifunctional character of magnetic particle clusters that may prove to be advantageous when used as a HGMS element. The orientation of the magnetic field, the separation s between the magnetite particles in the array, and the distance h between the paramagnetic particle and the surface of the magnetite array were all found to have significant effects. Both the large and small paramagnetic particles experienced interactions with the array that were strictly due to the array behaving collectively as a single magnetic unit; but these relatively “smooth” interactions were much longer‐ranged for the large paramagnetic particle. The large and small paramagnetic particles also experienced interactions with the array that were strictly due to individual (yet cooperative) interactions wit...