论文标题
在强静电耦合条件下的纳米流体电荷传输
Nanofluidic charge transport under strong electrostatic coupling conditions
论文作者
论文摘要
对纳米结合电解质的多体效应的全面描述是具有优化性能的纳米流体设备概念的重要步骤。通过将自持多价的电荷纳入穿着背景盐的泊松玻璃到托架玻璃托式方程中，我们研究了强耦合静电对电解质混合物的纳米流体运输的影响。我们发现，在阴离子纳米通道中，实验观察到的负面流电流源于CL吸引人的集体效应，这是通过互面吸附的多价阳离子的集体效应，而无滑层层降低了这些阳离子对净电流的流体动力贡献。从这种集体机制中出现的类似电荷电流状况被证明是无滑动区内平均电位的逆转。将形式主义应用于位于巨型介电介电常数的表面涂层的膜纳米液，我们揭示了一种新型的流动电流，该流由有吸引力的极化力激活。在这些力的效果下，在KCL溶液中添加多价离子会设置电荷分离，并在中性缝隙壁之间产生反电流。当前特性的可调性仅通过添加的多价离子的瓦特和量标识为纳米流体离子分离目的的有希望的机制。
The comprehensive depiction of the many-body effects governing nanoconfined electrolytes is an essential step for the conception of nanofluidic devices with optimized performance. By incorporating self-consistently multivalent charges into the Poisson-Boltzmann equation dressed by a background monovalent salt, we investigate the impact of strong-coupling electrostatics on the nanofluidic transport of electrolyte mixtures. We find that the experimentally observed negative streaming currents in anionic nanochannels originate from the collective effect of the Cl attraction by the interfacially adsorbed multivalent cations, and the no-slip layer reducing the hydrodynamic contribution of these cations to the net current. The like-charge current condition emerging from this collective mechanism is shown to be the reversal of the average potential within the no-slip zone. Applying the formalism to surface-coated membrane nanoslits located in the giant dielectric permittivity regime, we reveal a new type of streaming current activated by attractive polarization forces. Under the effect of these forces, the addition of multivalent ions into the KCl solution sets a charge separation and generates a counterion current between the neutral slit walls. The adjustability of the current characteristics solely via the valency and amount of the added multivalent ions identifies the underlying process as a promising mechanism for nanofluidic ion separation purposes.
