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In the field: In the presence of a time-varied magnetic field, electrostatically stabilized magnetite nanoparticles aggregate into microsized fibrous suprastructures (see image). The process is irreproducible for sterically stabilized colloids. It is inferred that the phenomenon results from the co-effects of magnetic moment interaction and electrostatic interaction that are connected by the time-varied magnetic field.
Sun et al. (Tue,) studied this question.