Abstract
We carried out microscopic analysis of ferromagnetic and paramagnetic colloidal systems by Brownian dynamics method. We analyzed secondary structures formed by chain clusters which are composed of paramagnetic particles in a dc magnetic field. Depending on the system height, wall and fat column structures were observed. We also analyzed the rotational dynamics of magnetic particles in alternating and rotating magnetic fields and discussed the relation between the rotational motions and apparent rheological properties.
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