Liquid-Solid Slip on Charged Walls: The Dramatic Impact of Charge Distribution

Physical Review Letters
Yanbo XieLaurent Joly

Abstract

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.

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Citations

Jan 22, 2021·The Journal of Physical Chemistry Letters·Yakang JinZhigang Li
Jul 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yuki Uematsu
Jul 25, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Rui KouYu Qiao
Jul 15, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Marc MeléndezRafael Delgado-Buscalioni

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