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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Electrolytic transport through a synthetic nanometer-diameter pore
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Electrolytic transport through a synthetic nanometer-diameter pore

机译：通过合成纳米直径孔的电解传输

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We have produced single, synthetic nanometer-diameter pores by using a tightly focused, high-energy electron beam to sputter atoms in 10-nm-thick silicon nitride membranes. Subsequently, we measured the ionic conductance as a function of time, bath concentration, and pore diameter to infer the conductivity and ionic mobility through the pores. The pore conductivity is found to be much larger than the bulk conductivity for dilute bath concentrations, where the Debye length is larger than the pore radius, whereas it is comparable with or less than the bulk for high bath concentrations. We interpret these observations by using multi-scale simulations of the ion transport through the pores. Molecular dynamics is used to estimate the ion mobility, and ion transport in the pore is described by the coupled Poisson-Nernst-Planck and the Stokes equations that are solved self-consistently for the ion concentration and velocity and electrical potential. We find that the measurements are consistent with the presence of fixed negative charge in the pore wall and a reduction of the ion mobility because of the fixed charge and the ion proximity to the pore wall.
机译：我们使用紧密聚焦的高能电子束在10纳米厚的氮化硅膜中溅射原子，从而产生了单个合成的纳米直径的孔。随后，我们测量了离子电导率随时间，浴液浓度和孔径的变化，以推断出通过孔的电导率和离子迁移率。对于稀浴浓度，发现孔隙电导率要比体积电导率大得多，在稀浴浓度下，德拜长度要大于孔隙半径，而对于高浴池浓度，它的电导率可以与体积相当或小于体积电导率。我们通过对通过孔的离子迁移的多尺度模拟来解释这些观察结果。使用分子动力学来估计离子迁移率，并通过耦合的Poisson-Nernst-Planck方程和Stokes方程描述了孔中的离子迁移，这些方程对于离子浓度，速度和电势自洽地求解。我们发现这些测量结果与孔壁中存在固定的负电荷和离子迁移率的降低相一致，这是因为固定的电荷和离子与孔壁的接近程度。

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