纳米富勒烯通道中的western调制电荷反转和离子输运
Wettability Modulated Charge Inversion and Ionic Transport in Nanofuidic Channels
摘要：
我们揭示了基底润湿性的作用，在多价离子存在下，在纳米通道中的界面电荷分布的符号上的反转。在鲜明对比的流行观念，疏水相互作用可能平凡地增加有效的表面电荷，我们表明，表面疏水性和界面静电之间的相互作用可能会导致在有效的界面电位的降低，以及随之而来的电荷反转超过制度的低表面电荷。我们还表明，这种现象，在串联与界面流体动力学可能会导致非平凡的增强或衰减，甚至逆转的净流动电流，这取决于相关的物理尺度。这些结果，支持分子动力学模拟和实验数据，可能承担深远的影响，在理解复杂的生物物理过程和设计涉及多价抗衡离子的纳米流体设备和系统。
英文摘要：
We unveil the role of substrate wettability on the reversal in the sign of the interfacial charge distribution in a nanochannel in presence of multivalent ions. In sharp contrast to the prevailing notion that hydrophobic interactions may trivially augment the effective surface charge, we demonstrate that the interplay between surface hydrophobicity and interfacial electrostatics may result in a decrease in the effective interfacial potential, and a consequent charge inversion over regimes of low surface charges. We also show that this phenomenon, in tandem with the interfacial hydrodynamics may non-trivially lead to either augmentation or attenuation or even reversal of the net streaming current, depending on the relevant physical scales involved. These results, supported by Molecular Dynamics simulations and experimental data, may bear far ranging consequences in understanding complex biophysical processes and designing nanofluidic devices and systems involving multivalent counterions.
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