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【2h】Non-Stokes drag coefficient in single-particle electrophoresis: New insights on a classical problem

机译单粒子电泳中的非斯托克斯阻力系数:关于经典问题的新见解

【摘要】We measured the intrinsic electrophoretic drag coefficient of a single charged particle by optically trapping the particle and applying an AC electric field, and found it to be markedly different from that of the Stokes drag. The drag coefficient, along with the measured electrical force, yield a mobility-zeta potential relation that agrees with the literature. By using the measured mobility as input, numerical calculations based on the Poisson–Nernst–Planck equations, coupled to the Navier–Stokes equation, reveal an intriguing microscopic electroosmotic flow near the particle surface, with a well-defined transition between an inner flow field and an outer flow field in the vicinity of electric double layer’s outer boundary. This distinctive interface delineates the surface that gives the correct drag coefficient and the effective electric charge. The consistency between experiments and theoretical predictions provides new insights into the classic electrophoresis problem, and can shed light on new applications of electrophoresis to investigate biological nanoparticles.

【摘要机译】我们通过光学捕获粒子并施加交流电场来测量单个带电粒子的固有电泳阻力系数,发现它与斯托克斯阻力明显不同。阻力系数与测得的电力一起产生与文献一致的迁移率-ζ电势关系。通过使用测得的迁移率作为输入,基于泊松-能斯特-普朗克方程的数值计算与纳维尔-斯托克斯方程相结合,揭示了粒子表面附近的一个有趣的微观电渗流,并且在内部流场之间有明确的过渡电双层的外边界附近的外流场。这种独特的界面勾勒出赋予正确阻力系数和有效电荷的表面。实验与理论预测之间的一致性为经典的电泳问题提供了新的见解,并可以为研究生物纳米颗粒的电泳新应用提供启示。

【作者】Liao, Maijia (廖麦嘉);Wei, Ming-Tzo (魏名佐);Xu, Shi-Xin (徐士鑫);Ou-Yang, H Daniel (歐陽新喬);Sheng, Ping (沈平);

【作者单位】

【年(卷),期】2019(),

【年度】2019

【页码】

【总页数】35

【原文格式】PDF

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【网站名称】香港科技大学图书馆

【栏目名称】所有文件

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