Electrokinetic non-equilibrium effects in transient nanopores

这个子项目在TRANSIEVES中具有主导性特征，旨在为主导实验提供模型描述。这些模型描述的目的是帮助识别和理解物种通过瞬变筛子传输的基本物理，以及识别参数空间中的“甜点”。这些甜蜜点是物种分离变得特别有效的地区。这些信息对先导实验来说将是无价的。此外，分项目B4探索了通过瞬时筛子进行物种分离的新概念，这可能会在研究股的第二个资助期内激发实验活动。更确切地说，我们打算开发基于特定问题的相关无量纲参数的最小模型。我们想要探索的第一个新的物种分离概念是基于锥形纳米孔，其栅极由交流电压供电。在这种孔隙中，通过利用平流输送和扩散输送之间的竞争，物种分离应该成为可能。第二个新概念是基于这样的观察，即在含有不同电泳迁移率的阴离子和阳离子的电解液中，以零时间平均交流电压激励的电极可以在电解液中产生不消失的时间平均电场。我们想要探索新出现的电场在多大程度上可以作为一种潜在的屏障，用于物种分离。最后但同样重要的是，我们想要建立一个与Lead实验A1的实验活动相关的模型。在这项实验中，将研究物种通过自更新液体孔的传输。该模型将具有降阶特性，并将补充子项目B2的数值模拟。

This subproject has an overarching character in TRANSIEVES and is intended to provide model descriptions for the lead experiments. The purpose of these model descriptions is to help to identify and understand the fundamental physics of species transport through transient sieves, as well as to identify “sweets spots” in the parameter space. These sweet spots are regions in which species separation becomes especially efficient. Such information will be invaluable for the lead experiments. In addition, subproject B4 explores novel concepts of species separation by transient sieves which are likely to excite experimental activities in the second funding period of the Research Unit. More exactly, we intend to develop minimal models that are based, among others, on the relevant dimensionless parameters of a specific problem. The first novel concept for species separation we would like to explore is based on conical nanopores with gate electrodes energized by an AC voltage. In such pores, species separation should become possible by exploiting a competition between advective and diffusive transport. The second novel concept is based on the observation that in an electrolyte with anions and cations of different electrophoretic mobilities, electrodes energized with an AC voltage of zero time average can produce a non-vanishing, time averaged electric field in the electrolyte. We would like to explore to what extent the emerging electric field can serve as a potential barrier that can be used for species separation. Last but not least, we would like to build a model related to the experimental activities of lead experiment A1. In this experiment, species transport through self-renewing liquid pores will be studied. The model will have a reduced order character and will complement the numerical simulations of subproject B2.