TED-AJ03-575 SECONDARY STRUCTURES CREATED BY CHAIN CLUSTERS OF PARAMAGNETIC PARTICLES IN A DC MAGNETIC FIELD

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Magnetorheological (MR) fluids are composed of paramagnetic particles of 0.1∿10μm in diameter, which are dispersed in a solvent such as water. A magnetic moment is induced in a paramagnetic particle when the particle is placed in an external dc magnetic field, and therefore anisotropic interactions are induced between paramagnetic particles via dipole-dipole potentials. When the interactions are strong, particles form chain clusters in parallel to an external magnetic field. Furthermore, the chain clusters create so-called secondary structures such as wall structures. The secondary structures may be changed dramatically depending on the number of particles in the chain clusters (the cluster length) and the intensity of the external magnetic field (the intensity of the induced magnetic dipole moment). However, the actual mechanism and dynamics, through which a variety of sencondary structures are created, have not yet been made clear. In this paper, we carry out Brownian dynamics simulations of an MR fluid system and investigate the pattern formations. We, in particular, focus on the effect of the system height in the direction of the external dcmagnetic field on the creation of secondary structures in the MR fluid system. In the second section, we explain our numerical model of an MR fluid system and the calculation method and conditions. In the third section, we show the result of the calculation and discuss the pattern formations in the MR fluid system. In the final section, we summarise the results obtained in this study. We find that when the system height is short, chain clusters are dispersed individually, but that as the system height increases, wall structures are created. When the system is high, fat columns, in which body-centred-tetragonal structures are formed by chain clusters, are created in the system. We also analyse the mechanism of the secondary structure formations and the dynamics of the structure creation processes.
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TED-AJ03-575 SECONDARY STRUCTURES CREATED BY CHAIN CLUSTERS OF PARAMAGNETIC PARTICLES IN A DC MAGNETIC FIELD

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