多離子效應對於電荷可調節系統中電滲透及電泳行為之影響

Abstract

電泳和電滲透是膠體科學中電動力學兩個非常重要的現象，在解析解或是數值解的研究中，能描述真實情況的理論模型是十分重要且必須的，因為其結果能用來解釋許多實驗中發現的特殊現象。為了使電動力現象之模擬能更貼近現實，本論文所採用的模擬條件係屬電荷可調節系統，在現實環境中許多膠體材質的表面是屬於此一系統；更重要的是，溶液相中含有多種離子而非典型的雙種離子或無鹽電解質系統。在電滲透方面，本論文比較了不同表面帶電系統的差異，以及多離子效應對於流體體積流率及離子電流之影響；而在電泳方面，則強調電雙層極化以及邊界效應對電荷可調節膠體粒子泳動行為之影響。本論文不僅對許多實驗中發現的特殊現象提出合理的解釋，更能預測未來研究時可能發生之現象，提供實驗研究學者實驗設計、解釋，及參數設定之方向。

Electroosmosis and electrophoresis are two important electrokinetic phenomena in colloid science. For analytical or even numerical approach in electrokinetic phenomena, a model which can describe the behavior of electrokinetic phenomena is desirable for its explanation for special observation in experiments. To simulate a case closed to reality, the charge-regulated system, which occurs on most substances’ surface, was concerned about; moreover, multiple ionic species instead of two types of ions were considered in aqueous phase. In electroosmosis, the differences between various types of charge systems are compared, and the effects of multiple ionic species on volumetric flow rate and ionic current were also investigated. For electrophoresis, the effects of double layer polarization (DLP) and boundary effects are highlighted, and these effects can post significant influences on the motion of colloidal particles. This research not only provides reasonable explanations behind special observation in real experiments but possibly predicts extraordinary phenomena in future studies.