磁性扁平粒子からなる高濃度サスペンションの相転移と内部構造発現現象に関する擬2次元モンテカルロ・シミュレーション(流体工学,流体機械)

概要

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We have investigated phase transitions and internal aggregate structures of a highly dense suspension composed of magnetic plate-like particles with a magnetic moment normal to the particle axis, by means of the Monte Carlo method. In the present study, we have considered a quasi-2D system in order to clarify the influences of the volumetric fraction of particles and magnetic field strength on particle aggregations and phase transitions. Internal structures of particle aggregates have been discussed quantitatively in terms of pair correlation and orientational pair correlation functions. The main results obtained here are summarised as follows. When the influence of magnetic interactions between particles is of the same order of the magnetic field strength, the particles form column-like clusters, and the internal structure of a dispersion shows solid-like structures. As the magnetic field strength becomes strong, the internal structure of a dispersion is transformed from solid-like structures into isotropic ones. However, as the volumetric fraction increases, the particles form brick wall-like structures under circumstances of a strong applied magnetic field, and the internal structure of a dispersion exhibits solid-like ones.
2010-01-25