粒子間相互作用が希薄な粘土コロイド分散系の粘度に及ぼす影響

抄録

High-swelling montmorillonite shows tremendously large viscosity as compared with low-swelling kaolinite. However, the effect of swelling ratio cannot explain the difference of viscosity quantitatively. Therefore, the effect of interacting force between particles on viscosity was introduced. That is, viscosity was assumed to be determined as a function of particle-number density instead of particle-volume fraction. The new viscosity equation which contains hydrodynamic interaction due to collisions was proposed and the increasing rate of viscosity was calculated for the suspensions of clays which have no surface charges. Compared with our measurements that both kaolinite and montmorillonite took almost the same increasing rate of viscosity at the same particle-number density, it was found that interacting force between particles dominantly determined the viscosity.