熵电动力学:再循环,粒子分离和负迁移率
Entropic electrokinetics: recirculation, particle separation and negative mobility
摘要:
我们发现,当颗粒悬浮在电解质之间的波纹带电表面,电动流动导致一组新的现象,如颗粒分离,混合低雷诺数的微米和纳米器件和负迁移率。我们的分析表明,这种现象的出现,对于不可压缩流体,由于静电双层和波纹几何约束之间的相互作用,它们被放大时,通道的宽度是可比的德拜长度。我们的表征使我们能够了解这种现象的物理起源,因此在各种情况下,从纳米和微流体设备到生物系统,它们可能的相关性上的阴影。
英文摘要:
We show that when particles are suspended in an electrolyte confined between corrugated charged surfaces, electrokinetic flows lead to a new set of phenomena such as particle separation, mixing for low-Reynolds micro- and nano-metric devices and negative mobility. Our analysis shows that such phenomena arise, for incompressible fluids, due to the interplay between the electrostatic double layer and the corrugated geometrical confinement and that they are magnified when the width of the channel is comparable to the Debye length. Our characterization allows us to understand the physical origin of such phenomena therefore shading light on their possible relevance in a wide variety of situations, ranging from nano- and micro-fluidic devices to biological systems.
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