Advanced Technology Development Center, Indian Institute of Technology Kharagpur, Kharagpur, India.
Electrophoresis. 2013 Aug;34(15):2193-8. doi: 10.1002/elps.201300094. Epub 2013 Jul 8.
Electrokinetics in salt-free media (in which counterions are only present) is central to the performance of many systems of modern technological relevance, ranging from ion-selective nanopores to electronic papers. Here, we introduce an analytical theory to describe the size dependence of electroosmosis in such typical scenarios, exhibiting an interesting confluence of the implications of interdependence of the electroosmotic transport mechanisms, ionic sizes, and confinement dimensions along with the counterion concentration. Our results do reveal that the concerned mobility parameter, describing the strength of electroosmotic transport, increases simultaneously with increments in the surface charge density as well as an ionic size factor (also known as the steric factor), bearing far-ranging consequences in microfluidic and nanofluidic technology.
在无盐介质（其中仅存在抗衡离子）中的电动现象是许多现代技术相关系统性能的核心，从离子选择性纳米孔到电子纸都有涉及。在这里，我们引入了一种分析理论来描述这种典型情况下电渗流的尺寸依赖性，展示了电渗流传输机制、离子大小和限制尺寸以及抗衡离子浓度的相关性的影响的有趣融合。我们的结果确实表明，所涉及的描述电渗流传输强度的迁移率参数随着表面电荷密度以及离子大小因子（也称为空间因子）的增加而同时增加，这在微流控和纳流控技术中具有深远的影响。
