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標題: | 單一液滴核心之軟球於電解質溶液之電泳現象探討 Electrophoresis Phenomena of a Core-Shell Droplet in Electrolyte Solutions |
作者: | Jung-Chun Lin 林戎峻 |
指導教授: | 李克強(Eric Lee) 李克強(Eric Lee | ericlee@ntu.edu.tw | 0000-0002-6036-9403), |
關鍵字: | 電泳,電雙層極化效應,液滴核心之軟球,數值解, electrophoresis,electric double layer polarization,core-shell droplet,numerical solution, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 本研究討論單一液滴核心之軟球於電解質溶液中之電泳行為,該粒子模型將傳統軟球模型結合介電液滴模型加以修正,為介電液滴與包覆於其表面的高分子多孔層組成的內核-外殼結構,可更加準確描述微膠囊、蛋白質冠奈米藥物等膠體粒子的電泳行為。 在液滴核心之軟球的電泳現象中,會有多種效應互相影響。分別為多孔層所造成的摩擦阻力與固定電荷,以及介電液滴造成的表面移動效應與表面上的額外電驅動力。本研究除了與硬球核、低表面帶電的軟球解析解做比較之外,亦比對了介電液滴與多孔球,其所含的多樣性非常值得探討。本研究藉由數值方法解除低電位的條件限制,並模擬液滴核心內外流體流動造成的流動力學與高帶電量下的電動力學行為,深入了解介電液滴吸附上高分子多孔層後改變的電泳行為。 研究結果顯示,介電液滴即使在包覆上多孔層後仍會在表面產生外部渦流,而多孔層的摩擦效應也因此在介電液滴不同的表面移動情況下,產生截然不同的效應。液滴內核流體的黏度非常高時,內核流體幾乎無法流動,表面移動效應極弱,液滴核心之軟球泳動行為接近軟球。除此之外,當液滴核心之軟球的液滴內核比例極大時,多孔層的影響極小,此時泳動行為接近介電液滴。反之,多孔層佔比極大時泳動行為會接近於多孔球,而與傳統軟球不同之處在於,液滴內核的表面移動效應較重要不可忽視。 液滴核心之軟球在離子濃度高的情況下,本身所帶的電荷會吸引過多的反離子進入電雙層,造成反離子遮蔽效應,甚至出現泳動度反轉,此現象亦與介電液滴表面與多孔層的帶電量高度相關,本研究亦針對此做深入探討。 This thesis discusses the electrophoretic behavior of a core-shell droplet in electrolyte solution. The particle model combines the conventional soft particle and dielectric droplet model into a core-shell structure composed of internal dielectric droplet core and polymer porous layer coating on its surface, which can more accurately describe the electrophoretic behavior of colloidal particles such as microcapsules, protein corona nanodrugs and so on. The electrophoretic phenomenon of a core-shell droplet is affected by much influence, such as friction resistance and fixed charge caused by porous layer, or surface shifting effect and Maxwell stress tensor arose from dielectric droplet. In addition to the comparison with the analytical solutions of low surface charged soft particle, the study also compares with dielectric droplets and porous particles, and its diversity is worth discussing. In this study, numerical methods were used to remove the restrictions of low potential, simulating the flow mechanics caused by the fluid inside and outside the droplet core and the electrodynamic behavior under high charged condition, so as to have an in-depth understanding of the electrophoretic behavior of dielectric droplets after adsorption on the polymer porous layer. The results show that, even coated with the porous layer, the dielectric droplets still generate external vortices on the surface, and the friction resistance of the porous layer will induce different effects under different surface shifting conditions of the dielectric droplets. When the viscosity of the droplet core fluid is very high, the core fluid can hardly flow, the surface shifting effect is very weak, and the electrophoretic behavior of the core-shell droplet is close to the corresponding soft particle. In addition, when the proportion of droplet core is very large in core-shell droplet, the influence of the porous layer is very small, and the electrophoretic behavior is close to that of the dielectric droplet. On the contrary, when the porous layer accounts for a large proportion, its electrophoretic behavior will be similar to the porous particle. However, different from the soft particle, the surface shifting effect of the droplet core still exists and cannot be ignored. When the concentration of solution is high, the core-shell droplet will attract counterion into its electric double layer, causing counterion condensation, or even reversing its mobility This phenomena is highly related to electric charge of dielectric droplet and porous layer, and we also makes a thorough discussion. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/83664 |
DOI: | 10.6342/NTU202202443 |
全文授權: | 未授權 |
顯示於系所單位: | 化學工程學系 |
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