溫度對電滲透流與表面帶電情況對擴散滲透流之影響

Influence of Temperature on Electroosmosis and Surface Charge on Diffusioosmosis

張景欣(Ching-Hsin Chang)

指導教授 ： 徐治平

國立臺灣大學/工學院/化學工程學研究所/碩士(2014年)

https://doi.org/10.6342/NTU.2014.00395

摘要

近年來，利用電場、濃度場為驅動力的微米或奈米裝置發展蓬勃，搭配複合材料、分子改質等技術不斷進步，使得這些裝置在不同領域中都有相當的發展潛力。電滲透流和擴散滲透流皆為這些裝置中常見的現象，利用電解質溶液在電場或濃度場驅動下的流動，我們得以達到分離、純化等目的。吾人針對此二現象進行解析解或數值分析的探討，以期藉由理論分析提供各種現象的解釋。對於電滲透流，吾人藉由計算表面電位的解析解，探討表面電荷可調節的固態圓柱孔道中，溫度、pH值以及電解質濃度對於電滲透流流速的影響；對於擴散滲透流，吾人藉由數值分析模擬系統中流場、電場以及濃度場，探討帶有雙性電荷的奈米固體圓柱孔道中，在外加濃度梯度下產生擴散滲透流的機制，以及電解質濃度對擴散滲透流流速的影響。

關鍵字

電滲透流 ； 溫度效應 ； 表面電荷可調節 ； 擴散滲透流 ； 雙性電荷奈米孔道

並列摘要

Recently, the development of micro- or nano- scaled device utilizing the supplied electric field or salt concentration gradient as driving force is prosperous. Owing to the advance in composite material and molecular modification, these devices show potential on development in diversified field. Liquid electrolyte solution driven by electric field, known as electroosmosis, or driven by salt concentration gradient, known as diffusioosmotic flow, are the common phenomenon in such devices. We calculate the analytic solution or conduct numerical simulation on these two phenomena. For electroosmosis, we conduct the investigation on the influence of temperature, pH, and bulk electrolyte concentration on the electroosmotic flow in a pH-regulated, zwitterionic cylindrical pore under applied electric field. For diffusioosmotic flow, we simulate the flow in the bipolar cylindrical pore under applied salt concentration gradient based on continuum model. We also study the influence of bulk electrolyte concentration on the diffusioosmotic flow.

並列關鍵字

electroosmosis ； temperature effect ； pH-regulated ； diffusioosmotic flow ； bipolar

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