構造を形成する粒子分散系の流動挙動の研究

概要

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Rheological properties of particle suspensions, in which particulate coagulation structures are involved, have been described briefly. Magnetic Ba ferrite and/or smectite were selected as the dispersed particles. The flocs composed of both magnetic particle aggregation and immobilized medium components play an important role of suspension fluidity in such a manner that they make kinds of chains. High concentration of magnetic particles in the system results in the networks among these flocs or chains in a medium. In aqueous suspensions containing smectite particles which form "card house" structures by electrostatic interaction, different types of the networks among those clay particles exist in the dispersion system. Complicated rheological characteristics of the suspensions could be explained by the dynamical mode change in the networked coaguration structures.