2成分シリカ粒子の粒径比が流動場液体中での凝集状態に及ぼす影響

摘要

In order to obtain knowledge for designing a particle hetero-coagulation in a liquid flow field, effects of the median diameter ratio in 2-component silica particles on particle distribution in various Reynolds number and pH conditions were investigated. The diameter ratio was 0.9-45.8 and the mixing volume ratio was constant at 1:1. As evaluation values, (1) amount of coagulation, (2) coagulation diameter and (3) constituting particle diameter of coagulation were calculated. As a result, when the diameter ratio was relatively large, greater or equal 11.2, coagulation was prevented. On the other hand, when the diameter ratio was relatively small, less or equal 1.5, the coagulation diameter and constituting particle diameter can be controlled by Reynolds number. The possible causes of the effects were discussed by focusing on a hetero-coagulation theory and a particle behavior in a flow field.%様々な分野の原材料から最終製品において，粒子はrn液体中に分散させた懸濁液として利用されている。しrnかし，液体の条件によっては，粒子は凝集を引き起こrnす。一般的に凝集はトラブルの対象として扱われるrnが，凝集を上手く利用した技術もある。特に，異粒径rnおよび異種の粒子による凝集はヘテロ凝集と呼ばれてrnおり，ハイブリッド材料，塗料，洗浄など多くの分野rnへ応用できるため，1960年代から今日に至るまで精力rn的に研究が行われている。