混合サスペンションの分散性と流動性に対する分散媒および分散方法の影響

抄録

Dispersing and rheological properties of ZnO-Fe₂O₃ mixed suspensions were studied under various conditions of dispersing media, particle number ratios, and means of mechanical agitation or peptization prior to the measurements. When the total solid content was kept constant, the sedimentation volume V_s and the parameter αβ, calculated by applying Casson's equation to flow curves, varied in parallel to each other with varying volume fraction of Fe₂O₃ in the dispersing phase m and showed maxima at a certain value m_m. These maxima were most remarkable when aqueous solution of Na₄P₂O₇ was used as medium which showed the highest dispersibility for each single component. The value of m_m was closely related to the particle number ratio, 1:1. When the mechanical agitation or mixing was insufficient, the maximum in V_s was much less remarkable or disappeared even in Na₄P₂O₇ solution.