Liquid-Solid Slip on Charged Walls: The Dramatic Impact of Charge Distribution.,Physical Review Letters

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Liquid-Solid Slip on Charged Walls: The Dramatic Impact of Charge Distribution.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-06-29 , DOI: 10.1103/physrevlett.125.014501
Yanbo Xie ₁ , Li Fu ₂ , Thomas Niehaus ₃ , Laurent Joly _{3,

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Affiliation

Nanofluidic systems show great promise for applications in energy conversion, where their performance can be enhanced by nanoscale liquid-solid slip. However, efficiency is also controlled by surface charge, which is known to reduce slip. Combining molecular dynamics simulations and analytical developments, we show the dramatic impact of surface charge distribution on the slip-charge coupling. Homogeneously charged graphene exhibits a very favorable slip-charge relation (rationalized with a new theoretical model correcting some weaknesses of the existing ones), leading to giant electrokinetic energy conversion. In contrast, slip is strongly affected on heterogeneously charged surfaces, due to the viscous drag induced by counterions trapped on the surface. In that case slip should depend on the detailed physical chemistry of the interface controlling the fraction of bound ions. Our numerical results and theoretical models provide new fundamental insight into the molecular mechanisms of liquid-solid slip, and practical guidelines for searching new functional interfaces with optimal energy conversion properties, e.g., for blue energy or waste heat harvesting.

中文翻译：

带电壁上的液固滑移：电荷分布的巨大影响。

纳米流体系统在能量转换中显示出广阔的前景，其中纳米级的液固滑移可提高其性能。但是，效率也受表面电荷控制，这已知可以减少打滑。结合分子动力学模拟和分析发展，我们显示了表面电荷分布对滑移电荷耦合的巨大影响。均相带电的石墨烯表现出非常良好的滑移带电关系（通过新的理论模型进行了合理化，可纠正现有技术的一些弱点），从而导致巨大的动能转化。相反，由于捕获在表面上的抗衡离子引起的粘性阻力，滑移在异质带电表面上受到严重影响。在那种情况下，滑移应取决于控制结合离子比例的界面的详细物理化学。我们的数值结果和理论模型为液固固形物的分子机理提供了新的基础知识，并为寻找具有最佳能量转换特性的新功能界面（例如用于蓝色能量或废热收集）提供了实用指南。

更新日期：2020-06-29

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