The effect of interaction between particles on flow characteristic of the clay colloidal dispersion system

本研究定量地阐明了定常流动下的流体动力相互作用和粘弹性性能取决于扩散双层层的厚度和色散区粒子间作用力的强度，而在色散区，斥力是粒子间相互作用力的优势。结果摘要如下所示。蒙脱土钠在分散条件下的水动力相互作用仅依赖于弥散双层，随着弥散双层厚度的增加，粘土颗粒之间的相互作用也变得更强。这一事实表明，水动力相互作用是由第二次电粘性效应引起的。利用Maxwell模型分析各盐浓度下悬浮液的流动曲线，定量得到：不仅有牛顿粘度，还有应力弹性模量和松弛时间。结果表明，随着alt浓度的降低，这些流变常数增大。这一事实表明，即使颗粒的结构没有发生变化，颗粒之间的排斥力也会影响悬浮液的流动特性。通过对悬浮状态下蒙脱土颗粒取向的检测，发现蒙脱土颗粒以0.011体积分数平行排列。因此，由于DLVO理论，在计算排斥力时采用平行板的近似公式是合适的。考察了各盐浓度下的排斥力与黏度系数、弹性模量和松弛时间的关系，结果表明，排斥力的增大使蒙脱土悬浮液向固体性质转变。此外，蒙脱土分散体系的黏弹性与斥力之间的关系是线性的，因为这些流变性常数与颗粒间的斥力成比例地增加。少

In this study, it was quantitatively clarified that hydrodynamic interaction and viscoelastic property under steady flow depended on thickness of the diffusion double layer and intensity of the interparticle force in the dispersion region where repulsive force excels as interaction force between particles. The summary of the results is shown below.The hydrodynamic interaction of sodium montmorillonite under dispersed condition depends only on the diffuse double layer, and interaction between clay particles becomes also stronger as the thickness of the diffuse double layer increases. This fact shows that hydrodynamic interaction is caused by the second electroviscous effect.By analyzing the flow curve of suspension for each salt concentration using the Maxwell model, the following were quantitatively obtained : Not only newton viscosity but also elastic modulus and relaxation time of stress. As the results, it was proven that these rheology constants increased with the lowering of the s … More alt concentration. This fact indicates that repulsive force between particles influences the flow characteristic of the suspension, even when structural change of the particle is not produced.As a result of examining orientation of the particle in the suspension state, the montmorillonite particle is arranged in parallel at 0.011 volume fraction. Therefore, it is appropriate to use the approximate formula of parallel plates due to DLVO theory in the calculation of the repulsive force.As a result of examining the relationship between repulsive force for each salt concentration and coefficient of viscosity, elastic modulus and relaxation time, it was shown that the montmorillonite suspension was made to change to more solid property by the increase in the repulsive force. In addition, the relation between repulsive force and viscoelastic property of montmorillonite dispersed system is linear, because these rheology constants increase in proportion to the repulsive force between particles. Less