|Title:||Effect of multiple ionic species on the electrophoretic behavior of a charge-regulated particle||Authors:||Hsu J.-P.
|Issue Date:||2010||Journal Volume:||26||Journal Issue:||22||Start page/Pages:||16857-16864||Source:||Langmuir||Abstract:||
It is often assumed in the conventional electrophoresis analysis that the liquid phase contains only one kind of each cation and anion. That analysisis extended tothe case where the liquid phase contains multiple ionic species inthis study so that the conditions considered are closer to reality. Using a dispersion of SiO2 particles, which is of a charge-regulated nature, as an example, where the dispersion pH is adjusted by HCl and NaOH, numerical simulation is conducted to examine the electrophoretic behaviors of the particle under various conditions.We show that the presenceof multiple ionic species is capable of yielding profound and interesting electrophoretic behaviors, which are justified by the experimental data in the literature. In addition, we show that two types of double-layer polarization (DLP) are present that have not been reported previouslyin the electrophoresis analyses. TypeI DLP, which reduces the mobility ofaparticle, occurs inside the double layer, and type II DLP, which raises that mobility, occurs immediately outside the double layer. ? 2010 American Chemical Society.
|Appears in Collections:||化學工程學系|
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