許多工業上的固液分離程序涉及次微米粒子之聚集，其中這些膠體系統其穩定性與 粒子表面電荷有關，次微米粒子之聚集可由添加適量的電解質達成，另一個去穩定化的 效果亦可由添加高分子凝聚劑達到，儘管膠體科學已有長足的發展，然而過去多只著重 於膠體粒子聚集機制的研究，對於所聚集形成的聚集體結構卻少有探討。 由於對聚集體結構不完全的瞭解，過去研究多假設它們複雜的結構為均勻的聚集 體，如此簡化的假設自然不符合真正的處理程序。近來探討聚集體結構多使用碎形維度 來衡量其緻密性，常見之方法有光散射、自由沈降及影像處理。本計畫藉由不同的去穩 定方法，例如改變電解質、高分子凝聚劑的濃度，或不同的處理溫度，探討聚集體形成 機制與其結構間之關係，期能對精密固液分離程序之效率有所裨益。 Many industrial solid-liquid separation processes involve aggregates of sub-micron particles. The stability of the colloidal systems is controlled by surface charge on the particles. Aggregation of these sub-micron particles can be achieved by addition of appropriate electrolyte and polymeric flocculant. Despite the long term development of the colloid science, the researchers focus on the kinetic of the aggregation in the past years. But the structure of the aggregates formed was less known. Owing to the non-fully understanding of the aggregates structure, researchers generally assumed the real complex structure of the aggregates to have a homogeneous internal structure. This kind of simplication doesn』t fit to the real conditions. In recent years, fractal dimension is used to describe the structure of the aggregates. Some techniques to measure fraction like light scattering, free settling, and image analysis. This project will discuss the relation between the growing kinetics of the aggregates and its internal structure by chancing the concentration of polymeric flocculant, pH value, temperature etc.
