The relationship between microstructure changes and rheological properties in suspensions containing boehmite particles, which are well applied in various industrial wash-coating processes, was investigated by changing pH condition. The boehmite particles in suspensions were either well dispersed or aggregated depending on the pH, owing to the relative contributions of repulsive interaction between particles as well as hydrolysis and condensation reactions. Four groups of boehmite suspensions were classified as very low, intermediate, almost zero charge, and high pH regimes based on their colloidal behaviors, and their microstructural differences were investigated using transmission electron microscopy (TEM) and multi-speckle diffusing wave spectroscopy (MSDWS). For gel-like suspensions of three groups, various rheological properties such as shear viscosity, viscoelastic modulus, yield stress, and recovery behavior were extensively compared, and the results clearly demonstrated that a suspension with high yield stress was not fully recovered into the original state when disturbed at high shear rates.

通过改变 pH 条件研究了在各种工业洗涂工艺中广泛应用的含有勃姆石颗粒的悬浮液的微观结构变化与流变性能之间的关系。由于颗粒之间的排斥相互作用以及水解和缩合反应的相对贡献，悬浮液中的勃姆石颗粒根据 pH 值分散或聚集。根据胶体行为，将四组勃姆石悬浮液分为极低、中等、几乎零电荷和高 pH 状态，并使用透射电子显微镜 (TEM) 和多散斑扩散波光谱 (MSDWS) 研究了它们的微观结构差异. 对于三组凝胶状悬浮液，